Correlation Flashcards
pearson’s r
most common correlation coefficent
what type of relationships does pearson’s r look at
linear only
what is a small pearson’s r
0.1
What is a medium pearson’s r
0.3
what is a large pearson’s r
0.5
what is a perfect pearson’s r
1
when is SPearman’s used
ranked data, non-parametric, ordinal scale
covariance
averaged sum of combined deviations
bivariate correlation
a correlation between 2 variables
partial corrections
looks at a relationship between 2 variables, but controls for the effect of one or more additional variables
coefficent of determination
measure of the amount of of variability in one variable that is shared by the other (R^2)
pearson’s r is used for ____ and ____ data
interval
ratio
kendall’s tau uses ____ data
ranked
if you compute kendall’s tau and pearson’s r for the same data set would you get the same test statistic?
no
when would you use a point-biserial correlation
when one of the 2 variables is a discrete dichotomy
is kendall’s tau used for non-parametric or parametric datas?
non-parametric
is pearson’s r used for non-parametric or parametric data?
parametric
when would you use kendall’s tau over spearman’s coefficent?
when you have a small data set with a alrge number of tied ranks
when would use use a biserial correlation?
when one variable is a continuous dichotomy
how do you interpret the coefficent of determination R
X% of variability in Y is accounted for by Z
what type of analysis is the coefficent of determinatino R^2 often used in?
regression
semi-partial correlation
quanitifes the relationship between 2 variables while accounting for the effects of a third variable on only ONE of the variables in the original correlation
