A test test for � driving while intoxicated intoxicated� was given given 100 times. times. 20 people people tested were actually intoxicated, and 10 people were mis-classified as intoxicated. What would the False ositive rate !e" 12.#$
r
%f a fire alarm malfunctions and fails to go off when there actually is a fire, that is a& False 'egative
r
(se the )inary *lassification +etrics preadsheet efinitions to answer the following& %f the the �classification classification incidencetest incidencetest incidence incidence� is 10$ for the the whole whole populatio population, n, and the the true true � condition condition incidence incidence� is 12$ for the the whole whole populatio population, n, the the /rue /rue ositive rate& cannot !e 100$
r
(se the *ancer iagnosis preadsheet to answer uestions to . *ancer iagnosis.xlsx 3eep the cost per False ositive test set at 4#00. (se + olver to determine the maximum cost per False 'egative test that permits an average cost per test of 4100. 415,062 412,22
x r
Assume a cost of 41#,000 per False 'egative 7F'8 and 4100 per False ositive 7F8. What is the minimum average cost per test" 41.00 x 42#9,600 x 41,##1 x
%f, instead of assuming a cost 41#,000 per F' and 4100 per F, the costs are assumed to !e 45,#00 per F' and 4#0 per F, what changes" /he minimum cost threshold of 1,##1.9:0 /he minimum *ost per /est r
x
(se logic and the definition in the )inary erformance +etrics preadsheet to answer the following ;uestion. )inary erformance +etrics.xlsx %n general, increasing the cost per F' while
cause the cost-minimi=ing threshold score to& ecrease
r
+a
r x x
Assuming the costs for classification errors are # million pounds per F' and million pounds per F, how much does changing the value at *ell : from 0 to 1 change the minimum cost per event" %ncreases !y # million pounds. (n
x
*hange the cost per F' to #0 million pounds. >ow does changing the data in cell : from a 0 to a 1 change the cost-minimi=ing threshold" ecreases it from 5# to 50 x ecreases it from 5# to 2 x ecreases it from 5# to . r (se the )inary erformance +etrics preadsheet definitions to answer the following ;uestion. )inary erformance +etrics.xlsx A population tested for � driving while intoxicated� has a *ondition incidence of 20$. %f the test has a true positive rate of 50$ and a false positive rate of 10$, what is the test� s ositive redictive ?alue 7?8" 0.#0
x
0.: x 0. r
(se the oldier erformance preadsheet to answer ;uestion 12. Forecasting oldier erformance.xlsx @an< the outcomes using soldier� s age as the score, with the oldest at the top. A threshold of 2 years represents what point on the @* *urve" .#, .#
x
.::, .5
x
.2#, .5#
x
