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pszurnicki
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increasing prevalence increases or decreases PPV? NPV
 increases PPV
 Decreases NPV

for low prevalance what happens to OR and RR
they become equal


positive skew affects mean, median, mode how
negative skew?
 mean >median>mode
 mean<median<mode

1 SD what %
2 SD Z value
3 SD Z value

T test
ANOV
Chi square
 mean between 2 groups
 mean between 2 or more groups
 diff between 2 or more % or proportions

