STAB22H3 Chapter Notes - Chapter 10: Scatter Plot, Standard Deviation
38
STAB22H3 Full Course Notes
Verified Note
38 documents
Document Summary
Goals of re-expression: make the distribution of a variable more symmetric, make the spread of several groups (as seen in side-by-side boxplots) more. Easier to summarize the centre, mean, standard deviation alike, even if their centres differ: make the form of a scatterplot more nearly linear, make the scatter in a scatterplot spread out evenly rather than thickening at one end. Certain kinds of data are more likely to be re-expressed in a certain way. Use it when the ladder of powers does not work. Make sure there is no zero or negative as a data value. Take the logs of both the x and y variables.
