i. What is your next action, if you obtain a perfect discriminatory test result (where both false negative and false positive rate are near zero) during model training? Justify your action.

Principles Of Marketing
17th Edition
ISBN:9780134492513
Author:Kotler, Philip, Armstrong, Gary (gary M.)
Publisher:Kotler, Philip, Armstrong, Gary (gary M.)
Chapter1: Marketing: Creating Customer Value And Engagement
Section: Chapter Questions
Problem 1.1DQ
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Question
Figure 1 shows the general discriminatory test for health status prediction.
"Perfect test
cut-off
True negative; TN
(specificity)
True positive; TP
(sensitivity)
False negative (FN)
False positive (FP)
Healthy
Sick
(a)
Test
cut-off
Moving cut-off to left
reduces false negatives
(higher specificity)
at cost of
reduced sensitivity
Moving cut-off to right
reduces false positives
(higher sensitivity)
at cost of
reduced specificity
TN
TP
FN
FP
Healthy
Sick
(b)
Figure 1. The Discriminatory Test with (a) A Good Discrimination Test Cut-off,
and (b) A Bad Discrimination Test Cut-off
i. What is your next action, if you obtain a perfect discriminatory test result
(where both false negative and false positive rate are near zero) during model
training? Justify your action.
ii. In which phase of machine learning methodology do you move the test cut-off
point as shown in Figure 1(b)? Justify why you should do that.
Transcribed Image Text:Figure 1 shows the general discriminatory test for health status prediction. "Perfect test cut-off True negative; TN (specificity) True positive; TP (sensitivity) False negative (FN) False positive (FP) Healthy Sick (a) Test cut-off Moving cut-off to left reduces false negatives (higher specificity) at cost of reduced sensitivity Moving cut-off to right reduces false positives (higher sensitivity) at cost of reduced specificity TN TP FN FP Healthy Sick (b) Figure 1. The Discriminatory Test with (a) A Good Discrimination Test Cut-off, and (b) A Bad Discrimination Test Cut-off i. What is your next action, if you obtain a perfect discriminatory test result (where both false negative and false positive rate are near zero) during model training? Justify your action. ii. In which phase of machine learning methodology do you move the test cut-off point as shown in Figure 1(b)? Justify why you should do that.
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