Chi square tests Flashcards
1
Q
What variables does it look at?
A
categorical
2
Q
what is the purpose?
A
see if there’s association between the variables
3
Q
expected cell frequency
A
= row total x column total / grand total
4
Q
what happens if > 20% of cell frequencies are less than 5?
A
collapse data
use yates/continuity corrected chi square test
5
Q
what is the chi square formula?
A
(O-E)^2/E
6
Q
what is the degrees of freedom?
A
(# rows - 1)(# columns - 1)
