Transformations
Statnotes - transformations - as part of testing assumptions, by Garson
- very nice, some pictures
Dallal's example of transformation in linear REGRESSION
RULE of THUMB: first transform the response variable y to correct heteroscedasticity (heterogeneity of variance) than apply transformation to predictiors to achieve linear relationship (bivariate scatterplot)
similar recommendations by NIST
Transformations:
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NIST handbook of statistics
http://www.itl.nist.gov/div898/handbook/index.htm
from STATNOTES: To correct left (negative) skew, first subtract all values from the highest value plus 1, then apply square root, inverse, or logarithmic transforms.
Journal
chass
journal of statistical teaching and education ???
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