Correlation Flashcards
1
Q
what does a scattergram tell you
A
type of relationship direction cluster (hugginess) gaps outliers
2
Q
what is covariance
A
not standardised
cross-product deviations (comparing 2 variables)
3
Q
what is variance
A
comparing 1 variable
4
Q
a scattergram can be
A
linear
curvilinear
none (random)
5
Q
mathematical assumptions of pearsons r
A
interval scale at least
normality
6
Q
normality is
A
normal skew normal kurtosis unimodal no outliers non sig. shapiro wilk >0.05
7
Q
pearsons r reveals
A
linear correlation range direction magnitude significance
8
Q
cohens weak, mod, strong for r
A
.1
.3
.5
9
Q
cohens effect size for r squared
A
.01 w
.09 m
.25 s
10
Q
factors affecting r
A
sample size
range restriction
heterogenous samples
11
Q
multicollineararity
A
more circle cross over
12
Q
ordinal data use
A
spearman
kendal
13
Q
categoric and interval data use
A
eta
point biserial
14
Q
categorical data use to test correlation
A
chi squared
15
Q
categorical data use to test effect
A
phi (2x2)
kramer (more than 2x2)
