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Manual de Practica de SPSS
III CICLO
MANEJO DEL PROGRAMA
1
1.- ENTRAR EN SPSS
Para entrar en SPSS, si no se dispone de acceso directo en el escritorio, se seguirá la secuencia Inic Inicio io – Prog Progra rama mas s – SPSS SPSS - SPSS SPSS 10.0 10.0 para para Wind Window ows. s. Una vez que se ha entrado al programa, aparece la siguiente pantalla: Desde esta pantalla se puede acceder directamente a una base de datos utilizada recientemente ( Abrir Abrir una fuente de datos existente), o crear una base de datos en blanco para introducir datos (Introducir Datos), etc.
Para salir de la pantalla, pantalla, pulsar pulsar Cancelar. En caso de no querer que aparezca esta pantalla la próxima vez que se acceda al programa, señalar la opción
2.- CREACIÓN DEL FICHERO DE D ATOS
Para empezar a trabajar con el programa SPSS lo primero que hay que hacer es construir el fichero de datos. Para ello se seguirán una serie de pasos, antes o después de introducir los valores. Este es el aspecto que presenta una base de datos vacía. Nótese la existencia de dos pestañas en la parte
inferior,
una
llamada "Vista de datos" (activada) y la
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Manual de Practica de SPSS
III CICLO
En la "Vista de datos" aparecen las variables colocadas en columnas y los sujetos en filas.
En la "Vista de variables" encontramos que éstas están colocadas en filas, mientras que en las columnas se sitúa cada una de las características que las define, y que veremos más adelante.
2.1. 2.1.-- DEFINICIÓN DE V ARIAB LES
Las variables se definen desde la "Vista de variables", donde encontramos, como hemos visto antes, una columna para cada característica: 2.1. 2.1.1 1.- Nombre Pinchando con el ratón sobre la celdilla correspondiente al nombre de la variable que estamos definiendo, podemos escribir directamente el nombre de la misma (máximo 8 caracteres). 2.1. 2.1.2 2.- Tipo Al pinchar sobre la celdilla, aparece un cuadro gris y al pinchar sobre el, accedemos a la siguiente pantalla: En esta opción se le indica al programa con qué tipo de datos estamos trabajando, así como el ancho de las celdillas y si quieren incluirse decimales.
2.1.3 .1.3..- Anchura Anchura
A través de esta opción se puede modificar la anchura de las celdillas que se había seleccionado en la pantalla anterior
Igualmente, a través de esta opción modificar el número de decimales que tendrán los datos, ya seleccionado en el apartado 2.2.1.Tipo 2.2.1.Tipo
2.1. 2.1.4 4.- Decimale Decimaless
12
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Manual de Practica de SPSS 2.1. 2.1.5 5.- Etiqueta Etiqueta
III CICLO
La etiqueta de la variable corresponde al nombre completo de la misma,
que aparecerá en las salidas. Para asignarla etiqueta de la variable, se escribe directamente sobre la celdilla activada (seleccionada con el ratón)
2.1.6.-Valores
Son los diferentes valores que puede tomar la variable. Se van añadiendo
a la lista, mediante el botón Añadir. Se pueden introducir modificaciones con los botones Cambiar y Borrar.
En Valor
se escribe el valor de la
categoría y el Etiqueta de valor , su nombre correspondiente. Para que sea aceptado hay que pinchar Añadir y se sitúa en en la ventana de abajo. abajo.
Ejemplo
En el caso de estar definiendo la variable sexo, los valores que puede tomar la
variable son dos: Mujer y Hombre, le asignamos a las mujeres un 1 y a los hombres un 2.
2.1.7.- Valores perdidos Accediendo a esta ventana, el programa pide que se le especifiquen los valores que no tiene que incluir en el análisis (errores del sistema, espacios en blanco, etc.) Se accede a esta ventana pinchando el extremo derecho (sombreado en gris) de la celdilla.
2.1. 2.1.8. 8.-- Columnas
Esta opción permite permite rectificar, rectificar, si fuera necesario, el ancho de la columna (especificado (especificado ya ya en 2.1.2.- Tipo) Tal como hicimos en las las opciones 2.1.3. y 2.1.4, se puede escribir directamente directamente el ancho de la columna en la celdilla activada (seleccionada con el ratón) o mover las flechas hasta encontrar el que se quiere. q uiere.
13
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Manual de Practica de SPSS 2.1. 2.1.9. 9.-- Alineación
III CICLO
En esta opción se ajusta al gusto la alineación de los caracteres, es decir, se especifica como se quiere que aparezcan los datos en las columnas, alineados a la derecha, en el centro, o alineados a la izquierda.
Al acceder a la celdilla (pinchando con el ratón en su extremo derecho, en el que aparece una flecha), se despliega un cuadro en el que hay que seleccionar la opción deseada, pinchando sobre ella.
2.1.10. Medida
Por último, en esta opción se determina el nivel de medición de la variable, pudiendo elegir entre Nominal, Ordinal o Intervalo.
Al acceder a la celdilla (pinchando con el ratón en su extremo derecho, en el que aparece una flecha), se despliega un cuadro en el que hay que seleccionar la opción deseada, pinchando sobre ella.
Al ir definiendo cada una de las variables del fichero, puede ocurrir que queramos utilizar utilizar la misma opción para más de una variable. variable. En lugar de ir definiendo cada variable, variable, se puede copiar la información información de una (con Ctrl + C o Edición + Copiar) Copiar) y pegarla en otra/s (con Ctrl + V o Edición + Pegar). Por ejemplo, ejemplo, si queremos queremos utilizar utilizar los mismos mismos "Valores" para más de una variable, basta definirlos para una, a continuación se selecciona la celdilla que corresponde la los Valores de esa variable, se pincha Ctrl + C o Edición + Copiar, y se selecciona el resto de variables variables que van a llevar los mismos valores (seleccionado (seleccionado con el ratón las celdillas correspondientes a los valores), y se pincha Ctrl + V o Edición + Pegar. Esto puede hacerse con todas las opciones menos con el Nombre de la variable. Una vez que están todas las variables definidas se meten los datos (la (la operación puede realizarse a la inversa, metiendo primero los datos y definiendo después las variables), el fichero de datos presentaría un aspecto similar al de la figura siguiente:
Este es el aspecto que muestra la Vista de Variables , una vez que se han definido todas, con la información correspondiente a
14
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Manual de Practica de SPSS
III CICLO
15
Este es el aspecto que muestra la Vista de Datos , una vez que se han introducido todos ellos.
Puede resultar interesante que, en lugar de los datos numéricos de las variables, aparezcan los Valores que se les ha asignado. asignado. Para ello, ello, hay que activar el icono:
Con el icono activado se puede operar igual que si no lo está
3.- MODIFICACIÓN DEL FICHERO DE D ATOS
Una vez que se ha elaborado el el fichero de datos, datos, se pueden introducir introducir en él todas las modificaciones que sean necesarias. En el caso de querer introducir casos o variables nuevas, basta seleccionar el menú Datos y acceder a Insertar variable o Insertar caso. Insertar variable Inserta una variable delante de la que esté seleccionada. (Si queremos insertar una variable X entre las variables Z e Y, seleccionaremos la variable Y; la nueva variable X se situará delante de ella). Esto puede hacerse tanto Vista de Datos Datos como desde la Vista de de Variable Variables. s. desde la Vista Insertar caso Del mismo modo, se pueden incluir nuevos casos (sujetos) en el fichero, para ello se seleccionará el sujeto que quedará detrás del nuevo, y se
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Manual de Practica de SPSS
III CICLO
Para realizar esta operación, se selecciona la variable o caso a eliminar y se pincha el botón Suprimir Eliminar variables o casos
4.- VER RESUMEN DE V ARIABLES ARIAB LES
Una vez que hemos elaborado todo el fichero de datos, podemos ver un resumen de las variables sin tener que ir a una a una viendo cómo se han definido. Utilid idad ades es – Vari Variab able les, s, donde se despliega una Para ello, se accederá al menú Util ventana en la que se encuentra información detallada de cada una de las variables. En esta ventana aparece un listado de variables así como la información de la que esté Pinchando Ir a se accede directamente al luga lugarr del del fich ficher eroo de dat datos os don donde de se se encuentra esa variable, sin necesidad de buscarla, lo que facilita el trabajo cuando trabajamos con un fichero extenso. La ventana no permite realizar ningún cambio, para hacerlo hay que acudir a la variable variable y realizarlos realizarlos en ella. seleccionada.
Nota: Igualmente se puede ir a un sujeto determinado sin tener
que pasarlos uno por uno. Para ello, se accede a Datos – Ir a caso,
y se escribe el caso al que se quiere ir, pulsando después
Aceptar.
5.- ORDENAR C ASOS
En un momento determinado, puede resultar útil tener los casos ordenados en una de las variables, el programa lo permite a través del menú Datos tos – Ord Ordenar
16
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Manual de Practica de SPSS
III CICLO
6.- ALMACENAMIENTO Y ACCESO A LOS D ATOS
Estas son las funciones básicas del editor de datos del programa SPSS, una vez que tenemos el fichero de datos preparado, ya se puede empezar con el análisis estadístico, sin olvidar antes guardar el fichero. 6.1. 6.1.-- GUARDAR EL FICHERO DE D ATOS Archivo – Guardar, y especificar el lugar donde se quiere guardar, Seleccionar Archivo así como el nombre asignado
Como puede verse, el procedimiento es el mismo que se sigue en cualquiera de los programas del entorno Windows. A esta opción se accede igualmente pinchando en el icono
6.2. 6.2.-- ACCESO A LOS D ATOS
Se procede del mismo modo, especificando el nombre y ubicación del archivo que queremos abrir, desde Archivo – Abrir - Datos
A esta opción se accede igualmente pinchando en el icono
17
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Manual de Practica de SPSS
III CICLO
La apariencia del visor es la siguiente:
18 El visor se divide en dos partes (de ancho regulable por el usuario). A la izquierda aparece el índice de lo que contiene el visor, que nos permite desplazarnos por los
INDICE
RESULTADOS
resultados que pinchemos sin necesidad de pasar por todos los demás. La parte de la derecha, es la que muestra los resultados de los análisis efectuados .
A través de los botones de la barra de tareas, podemos movernos del editor de datos al visor de resultados resultados de manera manera rápida y sencilla sencilla 8.- GUARDAR LOS RESULTADOS
Los resultados de los análisis pueden guardarse de diferentes formas: 8.1.- EN FORMATO SPSS Se guardarán de esta forma cuando vayan a abrirse posteriormente en este formato, es es decir, en equipos que tengan tengan instalado instalado el SPSS. Para ello basta con acceder a Archivo - Guardar y asignar el nombre y la ubicación deseados De nuevo encontramos una ventana de aspecto idéntico a la proporcionada por cualquier programa del entorno Windows. De nuevo también, es posible acceder a esta ventana a través del icono:
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Manual de Practica de SPSS
III CICLO
En esta ventana hay que especificar:
Qué queremos exportar Dónde lo queremos exportar
Cómo lo queremos exportar
8.2. 8.2.1. 1.-- Qué queremos queremos exportar Podemos exportar el documento completo (tablas y
gráficos, si los hubiera), hubiera), solo los gráfico, gráfico, o sólo las tablas. tablas. En esta opción seleccionaremos la opción que más se ajuste a nuestra necesidad
8.2. 8.2.2. 2.-- Dónde lo queremos queremos expor tar Hay que especificar dónde se quiere exportar
el visor de resultados, para lo que hay que ir a Exportar archivo.
Pulsando examinar , se accede a una pantalla en la que especificaremos dónde queremos guardar el archivo y con qué nombre (si no se especifica nombre, el programa por defecto lo llama OUTPUT.TXT). 8.2. 8.2.3. 3.-- Cómo lo queremos queremos exportar exportar Especificaremos el Formato de exportación,
donde se seleccionará la opción Archivo HTML (*.htm), que suele estar marcada por
19
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Manual de Practica de SPSS
III CICLO
9.1..1.- EN FORMATO SPSS Desde el Visor de Resultados, se accede a Archivo - Abrir
y se busca el archivo archivo que se quiere abrir. abrir.
20
La apariencia de los resultados en el visor de resultados del SPSS es tal como aparece en la figura
El archivo exportado puede ahora abrirse desde cualquier ordenador que no tenga instalado el programa SPSS, ahora con formato HTML. Para ello abriremos el procesadores de texto Word . Para abrirlo, accedemos a Archivo – abrir en tipo de archivo, seleccionamos Documento HTML o Todos los archivos, buscamos el que queremos abrir y aparece un documento con el aspecto siguiente: 9.2..2.- EN FORMATO HTML
La ventaja que tiene exportar en este este forma formato to es es que que permi permite te modificar las tablas, tal y como se hace en Word, posibilidad que en la salida de SPSS es mucho más limitada
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Manual de Practica de SPSS
III CICLO
ANALISIS ANA LISIS ESTADÍSTICO ESTA DÍSTICO DESCRIPTIVO Y DE FRECUENCIAS FRECUENCIAS
21 1.- ANÁLISIS DESCRIPTIVO
Para realizar un análisis descriptivo de datos, una vez recuperados los datos en la Descriptivos. Aparece una pantalla, acceder al menú Analizar – Estadísticos descriptivos – Descriptivos. pantalla en la que se da la opción de escoger una, varias o todas las variables de la base de datos para hacer el análisis. Rendimiento to en Historia, Historia, Rendimie Rendimiento nto en En este caso caso seleccionamos seleccionamos las variables: variables: Rendimien Filosofía Filosofía,, Rendimie Rendimiento nto en Idioma, Idioma, Rendimie Rendimiento nto en Matemáti Matemáticas cas y Rendimie Rendimiento nto en Dibuj Dibujo o. Para seleccionar las variables, se pinchan con el ratón y se arrastran a la ventana Variables. Esta opción nos permite obtener estadísticos estadísticos de resumen univariados univariados para varias variables en una única tabla y calcula valores tipificados (puntuaciones z), que pueden guardarse, si así se especifica, en el fichero de datos como una variable nueva.
Seleccionando esta opción, aparecerán las puntuaciones tipificadas en el fichero de datos.
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Manual de Practica de SPSS
III CICLO
15
Estadísticos Estadísticos descriptiv os
N Rendimiento en historia Rendimiento en filosofía Rendimiento en idioma Rendimiento en matemáticas Rendimiento en dibujo N válido (según lista)
Mínimo 100 100 100
0 0 0
Máximo 10 10 9
Media 5.73 5.50 5.32
Desv. típ. 2.27 2.34 2.08
100
0
10
5.70
1.96
100 100
0
10
5.50
2.19
Si se marcó la opción Guardar valores tipificados como variable , en el fichero de datos se crearán crearán unas variab variables les nuevas, nuevas, llamadas llamadas znombrevariable, con la puntuación típica de cada sujeto en cada variable. 2.- ANÁLISIS DE FRECUENCIAS
Accedemos a esta opción a través del menú Analizar – Estadísticos descriptivos – Frecuencias. Esta opción proporciona estadísticos y representaciones gráficas que resultan útiles para describir muchos tipos de variables. Es un procedimiento útil para realizar una inspección inicial de los datos.
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Manual de Practica de SPSS
III CICLO
16 La opci opción ón ES ESTA TADÍ DÍST STIC ICOS OS perm permititir iría ía seleccionar aquellos que se desee incluir en los resultados (procedimiento similar al presentado en la opción 1.Análisis descriptivo)
Los resultados obtenidos obtenidos aparecen en una tabla tabla similar a la presentada en la figura figura siguiente: Estadísticos
N
Válidos Perdidos
Estudios del padre 100 0
Profesión del padre 100 0
Estudios de la madre 100 0
Profesión de la madre 100 0
En una primera tabla aparecen los estadísticos seleccionados para cada una de las variables incluidas en el análisis.
A continuación se presentan las tablas de frecuencias, una para cada variable, en la que se aparece
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Manual de Practica de SPSS
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ESTADÍSTICA ESTADÍSTICA PARAMÉTRICA: PRUEBA T DE STUDENT Con la prueba “t de Student” se intenta probar la diferencia de medias para uno, dos o más grupos. Se trata de una prueba paramétrica, es decir, que entre otras cosas, la/s variable/s dependiente/s deben estar medidas en nivel de intervalo o razón. 1.- PRUEBA T PARA MUESTRAS INDEPENDIENTES
El programa SPSS, dentro del menú Analizar , tiene una opción para comparar independientes. medias y dentro de esta opción accedemos a Prueba T para muestras independientes. En el ejemplo que se desarrolla en este caso seleccionamos como variable de agrupación o variable independiente el Sexo que tiene dos categorías: MUJER (1) y HOMBRE (2). Como variables dependientes seleccionamos Rendimiento en Historia, Rendimiento en Filosofía, Rendimiento en Idioma, Rendimiento en Matemáticas y Rendimiento en Dibujo.
En esta pantalla seleccionamos las variables dependientes, así como la variable independiente
17
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Manual de Practica de SPSS
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Las Ho quedan formuladas de la forma siguiente: Ho (1): No existen diferencias estadísticamente significativas en el Rendimiento de los alumnos en Historia en función de la variable Sexo.
Ho (2): No existen diferencias estadísticamente significativas en el Rendimiento de los alumnos en Filosofía en función de la variable Sexo.
Ho (3): No existen diferencias estadísticamente significativas en el Rendimiento de los alumnos en Idioma en función de la variable Sexo.
Ho (4): No existen diferencias estadísticamente significativas en el Rendimiento de los alumnos en Matemáticas en función de la variable Sexo.
Ho (5): No existen diferencias estadísticamente significativas en el Rendimiento de los alumnos en Dibujo en función de la variable Sexo.
Interpretación de resultados
En el visor de resultados encontramos dos tablas (aquí se presenta la segunda en dos partes). En la primera tabla, el programa calcula los ESTADISTICOS DEL GRUPO, concretamente la media, la desviación típica y el error típico de medida de cada categoría de la variable independiente, sexo en este caso. Estadísticos Estadísticos de gru po
Desviación
Error típ. de
20
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Manual de Practica de SPSS
III CICLO
probabilidad asociada de 0,500. Si la hipótesis nula planteada Ho (1) era que no existen diferencias estadísticamente significativas en el Rendimiento de los alumnos en Historia en función de la variable Sexo,
un
con los resultados obtenidos, y trabajando a
= 0,05, podemos aceptarla (porque 0,500 > 0,05) y afirmar que no existen
diferencias estadísticamente significativas entre hombres y mujeres en el Rendimi Rendimi ento en Historia.
En las siguientes columnas, el programa nos ofrece los diferentes intervalos confidenciales (nivel de confianza 95%) para cada una de las comparaciones. Prueba de muestras independientes
Prueba T para la igualdad de medias
t
gl
Sig. (bilateral)
Diferencia de medias
Error típ. de la diferencia
95% Intervalo de confianza para la diferencia Inferior Superior
21
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Manual de Practica de SPSS
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22
Contrastes Posteriores
En caso de haber encontrado diferencias significativas, y para ver hacia que dirección de dan, dan, se se consulta consulta la tabla tabla ESTADÍSTICOS DE GRUPO, y en la la column columnaa MEDIA MEDIA,, se puede ver qué grupo obtiene una media superior. RUEBA T PARA MUESTRAS MUESTRAS RELACIONADAS 2.- PRUEBA Dentro del menú Analizar , entramos en la opción comparar medias y dentro de esta opción accedemos a Prueba T para muestras relacionadas. En este caso se trata de comprobar si existen diferencias estadísticamente significativas significativas entre la Capacidad de Concentración antes (de recibir un programa de entrenamiento de la concentración PEC), y la Capacidad de Concentración después (del PEC).
Seleccionamos estas
variables porque están medidas en nivel de razón. La H0 planteada es que no existen diferencias estadísticamente significativas
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Manual de Practica de SPSS
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A continuación aparece una tabla que nos proporciona la correlación entre las variables: Podemos ver que la correlación es significativa (sig. = 0,000 <
= 0,05) 0,05) y muy muy alta alta
(ver práctica de correlación) Por último aparece la tabla en la que se contrasta la hipótesis que poníamos en juego:
Prueba de muestras relacionadas
Correlaciones Correlaciones de muestras relacionadas relacionadas Diferencias relacionadas
N
Par 1 Par 1
Error típ. CapacidadDesviació de de la concentración y media Media n antes típ.
Capacidad de Capacidad de concentración concetración despues antes - Capacidad - 1 0 .3 2 1 3 .9 2 de concetración
1 .3 9
95% Intervalo de Correlpara aciólan confianza diferencia Inferior Superior
100
.744
-13.08
-7.56
Sig. t
.000
- 7 .4 1 5
gl 99
Sig. (bilateral) .0 0 0
23
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24
ESTADÍSTICA ESTADÍSTICA NO PARAMÉTRICA Las pruebas no paramétricas se utilizan para contrastar la existencia de diferencias significativas cuando la/s variable/s dependiente/s están medidas en nivel nominal u ordinal. El programa SPSS, dentro del menú Analizar , tiene una opción para Prueba Pruebas s no Param Paramétr étric icas as. Dentro de esta opción podemos encontrar varios casos entre los que cabe destacar: para 2 muestras independientes, para más de dos muestras independientes, para 2 muestras relacionadas, para más de dos muestras relacionadas, Chi cuadrado. Vamos a entrar únicamente en tres de estos casos, para el resto, se procede de la misma forma, seleccionando la opción correspondiente. 1.- PRUEBA NO P ARAMÉTRICA P ARA DOS MUESTRAS INDEPENDIENTES
Accedemos al menú Analizar
Pruebas no paramétricas
2 muestras
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Manual de Practica de SPSS
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Como siempre, enunciamos la Hipótesis nula a contrastar: H0: No existen diferencias estadísticamente significativas en los intereses profesionales de los alumnos en función del sexo. Interpretación de resultados En los resultados aparece una tabla en la que se muestra el número de sujetos que hay en cada categoría de la variable independiente, el rango promedio y la suma de Rangos
Interes profesional del alumno
rangos.
Sexo Mujer Hombre Total
N 53 47 100
Rango promedio 52.39 48.37
Suma de rangos 2776.50 2273.50
26
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Manual de Practica de SPSS
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2.- PRUEBA NO P ARAMÉTRICA P ARA K MUESTRAS INDEPENDIENTES
Para el caso de más de dos muestras independientes vamos a utilizar la paramétricas Prueba H de Kruskal-Wallis . Accedemos al menú Analizar – Pruebas no paramétricas Del mismo modo que el anterior contraste no pediremos estadísticos descriptivos en el menú opciones y seleccionaremos las variables dependientes. En este caso vamos a utilizar como variables dependientes el nivel de
– K muestras independientes
27
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Manual de Practica de SPSS
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28
Interpretación de resultados
En los resultados aparecen las siguientes tablas: Para
Rangos
Profesión del padre
Nivel social familiar Bajo Medio-Bajo
N 14 33
Rango promedio 76.00 66 15
cada
variable
dependiente introducida en el análisis, aparece el número de casos que hay
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Manual de Practica de SPSS
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3.- PRUEBA CHI CUADRADO Dentro de las pruebas no paramétricas, es decir las que se realizan con variables medidas en escala ordinal o nominal, se encuentra el CHI CUADRADO. Con esta prueba podemos comprobar si existen o no diferencias estadísticamente significativas entre frecuencias observadas (datos extraídos de la realidad) y frecuencias teóricas teóricas (o esperadas). Hablamos Hablamos en términos de frecuencias ya ya que con
29
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Manual de Practica de SPSS
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30
Interpretación de resultados
Aparecen en primer lugar las tablas con las frecuencias encontradas en cada categoría de cada una de las variables, así como lo que cabría esperar al azar (N / nº de categorías) y el residual. Sexo
N observado
N esperado
Residual
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Manual de Practica de SPSS
III CICLO
ANAL AN ALISIS ISIS DE VARIANZA VARIA NZA 1.- ANÁLISIS DE V ARIANZA SIMPLE.
El Análisis de Varianza simple (ANOVA) (ANOVA) es es una técnica estadística estadística utilizada utilizada para para contrastar la existencia de diferencias estadísticamente significativas entre las medias de las muestras sometidas a diferentes tratamientos. La hipótesis nula (H0) general que se pretende contrastar es la siguiente: No
31
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