Correlation and regression

7 important questions on Correlation and regression

What is a contingency table?

A table that allows you to display the relation between to ordinal or nominal values

How do you compute a column percentage?

cell / total(column) x 100%

How do you compute the marginal proportions?

cell in the margin / total margin
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When do you use a scatterplot?

When you work with quantitative values.

In a scatterplot, which values are assigned to the x-axis and the y-axis?

x-axis = independent value, y-axis = dependent value (chocolate on the x, bodyweight on the y)

How do you compute the Pearson's R?

(∑Zx Zy) / n-1

How do you compute the regression coefficient?

r(sty/stx)

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