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1 Jochem
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What is a nominal variable?
One that has two options and is non numerous (or made artificially numerous) (example, does someone work part time or fill time) -
What is a discrete variable?
One with whole numbers as an answer -
Which graphs are appropriate for ordinal variables?
Histogram or pie chart -
How does one measure the center and spread of an ordinal variable?
Measure = mode (median only when intervals between variables are even)
Spread = not applicable for ordinal variable -
You want to measure the central value and variation of a discrete variable, how does one do that?
Central value = mean, mode, median
Variation = standard deviation and IQR -
How can outliers be identified
Z-score (outside -2,5 & 2,5) or box plot -
How to compare two discrete variables before and after?
Make two histograms or make two box plots -
Which test is appropriate to test if two qualitative variables relate?
Make a cross table and do a chi squared test (with chi square test all cells should have a count of at least 5) (row 1 * row 2 / total count) -
Which test is appropriate if you measure or describe the relation between two qualitative variables?
Kendall tau-b if 2x2 of 3x3 if ordinal x ordinal
Kendall tau-c if 2x3 or 1x3 if ordinal x ordinal
Cramer's V is norminal x ordinal -
Which test is appropriate if you estimate the difference between two quantitative variables of two independent samples?
Make a confidence interval with a independent samples t-test
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