interpritation of statistical terms

cohens d= 0.2

small effect but noticible

cohens d= 0.5

medium effect but clear difference

cohens d= 0.8

large effect but substantial and clinically meningful

cohens d= >1.0 

very large effect 

r =

correlation

r = 0.1

small

r =0.3

medium

r = 0.5+

large 

OR =

Odds ratio

OR = 1.0

no effect

OR = > 1.0

increased odds

OR = < 1.0

decreased odds

OR = 2.0

double the odds

OR = 0.50

half the odds

narrow CI

more precise

wide CI

less precise

for ratios- if the CI does not cross 1

its statistically significant

for mean if the CI does not cross 0

its statistically significant

postive skew 

mean>median 

negative skew

mean<median

68% is within

+- 1SD

99.7% is within

+- 3 SD

95% is within

+- 2 SD

for logistic regression larger OR =

strong predictor

for liner regression larger b1 = 

stronger predictor