From: Correction of the significance level when attempting multiple transformations of an explanatory variable in generalized linear models
Number of transformations
c k 1
c k 2
1
q 1/3
q 2/3
2
q 1/4
q 3/4
3
q 1/2
4
5
q 2/5
q 4/5
6
q 1/5
q 3/5
7
8
9
10