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topics for var cov corr and crosstabs

# topics for var cov corr and crosstabs - Marginal is a...

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Variance is always greater than 0 Therefore, what is also always greater than 0? Correlation between what 2 numbers? Covariance between what 2 numbers? Mode Box Plot Values of r ScatterPlots and r What you can do with crosstabs- marginal, conditional and joint probabilities Mean and Median Relationship (right-skewed, left-skewed, symmetric) Standard Deviation is what? Interrelation of correlation, covariance, variance, standard deviation Review of Cross Tabs (from Friday’s class) Joint is a cell total / overall total Conditional is a cell total / row (or column total)

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Unformatted text preview: Marginal is a row (or column total) / overall total Joint: happy and in class is 2/ 100 Marginal: happy is 42/ 100 At home is 50/100 Conditional: happy given in class is 2/50 Not happy given at home is 10/50 Key words: and implies joint, given implies conditional, lack of the first two pretty much implies marginal R from cov, stdev x, stdev y Cov from r, stdev x, stdev y R from r2 Var/ stdev Mean R from a scatterplot Note: Excel’s covar uses n, not n-1. This is the problem....
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