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Unformatted text preview: We should start with no transformation of the response, and then successively use a stronger transformation until the residuals reveal an acceptable situation We know we have gone too far in transforming the data when the nonrandom pattern actually reverses itself (i.e., a bowtie pattern switches to become narrower at the ends than the middle) Transformation Sequence Type Formula Example Use None Square Root y=sqrt (y) Counts Natural Log y=ln(y+k) Growth data Base 10 Log y=log10(y+k) Variance Reciprocal Sq Rt y=1/sqrt(y) Inverse y=1/y Rate data Power y=(y+k) x Logit Bounded data ArcSin Sq Rt y=arcsin(sqrt(y)) Binomial data _ ' ln( ) _ y lower lmt y upper lmt y=...
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 Spring '08
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