Robust statistics, linear transformations

Question 1

outlier

Answer 1

a value outside the usual range

Question 2

robust statistics

Answer 2

a statistic not much affected by outliers

• median, quartile, IQR
• mean is affected
• SD is most affected

Question 3

linear transformations of a variable

Answer 3

does not change the overall shape of the variable

- helps with changing units of measurement

Question 4

false positives and negatives

Answer 4

P(T+/D-) test positive but you don’t have the disease

can use conditional distribution - if you test positive, the probability that you have the disease is…