research lecture 9 Flashcards
when do we use non parametric statistics
nominal data
ordinal data
interval/ratio data that fail to meet the assumptions of parametric stats
MANN-WHITNEY U
WILCOXON SIGNED RANKS
SPEARMAN CORRELATION
LOGISTIC REGRESSION
MULITINOMIAL REGRESSION
ORDINAL REGRESSION
these are all considered what
non parametric statistics
what is the measure of associated and is used for inter rater agreement
kappa
what does kappa score take into account
that 2 one more observes may agree or disagree just by change
a kappa of ___ indicates a perfect agreement
a kappa of ___ indicated agreement equivalent to change
0
1
kappa can also be tested for ____
significance
when is kappa less than a change of agreement ? what about the perfect agreement
<0
1 is perfect
what kind of data is chi square analysis used for
nominal data
what are the 2 main chi square test
goodness of fit
test for independence
when do we test for independence for chi square
used with 2 variable to test whether they are independent of one another
can chi square answer a difference question or a relationship question ?
yes just depends on how u write it
when is factor analysis used on
outcome measures … usually questionnaires
what determines the number of constructs in the tool by explaining the correlation between variables
exploratory factor analysis
what definition is this … how much difference there is between a sample’s mean and the population mean.
standard error of the mean
this is how repeated measures of a
person’s score on the same instrument tend to vary around their “true score”, double this value for 95% change of capturing a patient’s true score.
standard error of measurement
