Box-Cox Normality Plot
# observations x84
maximum correlation0.870703111543209
optimal lambda1.47
transformation formulafor all lambda <> 0 : T(Y) = (Y^lambda - 1) / lambda


Obs.OriginalTransformed
120.556.9911739392212
220.556.9911739392212
320.556.9911739392212
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520.556.9911739392212
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4815.537.5555349595888
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5015.537.5555349595888
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6510.520.8887738029664
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805.57.65684340418776
815.57.65684340418776
825.57.65684340418776
835.57.65684340418776
840.5-0.434705919128827


Maximum Likelihood Estimation of Lambda
> summary(mypT)
bcPower Transformation to Normality 
  Est Power Rounded Pwr Wald Lwr Bnd Wald Upr Bnd
x    2.1886           2       1.4363       2.9409
Likelihood ratio test that transformation parameter is equal to 0
 (log transformation)
                           LRT df       pval
LR test, lambda = (0) 93.24308  1 < 2.22e-16
Likelihood ratio test that no transformation is needed
                          LRT df       pval
LR test, lambda = (1) 13.8563  1 0.00019733