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ANKH1
Pyrite | Level 9

Hello, 

 

How do you deal with a dependent variable that has some values equal to zero when using boxcox transformations in proc transreg?

 

proc transreg data = sample1;
model boxcox(DV)=identity(IV);
run;

 

ERROR: 11 invalid values were encountered while attempting to transform variable DV.

 

Thank you

4 REPLIES 4
PaigeMiller
Diamond | Level 26

You could prevent λ in the Box-Cox transformation from being exactly equal to zero, then you shouldn't have any problems with zero values of Y.

 

https://documentation.sas.com/?cdcId=pgmmvacdc&cdcVersion=9.4&docsetId=statug&docsetTarget=statug_tr...

--
Paige Miller
ANKH1
Pyrite | Level 9

Thanks for your answer. I tried this and didn't work:

 

proc transreg data = sample1;
model boxcox(DV / lambda ^= 0) = identity(IV);
run;

PaigeMiller
Diamond | Level 26
proc transreg data = sample1;
model boxcox(DV / lambda = -3 to -0.25 by 0.25,-0.1, 0.1, 0.25 to 3 by 0.25) = identity(IV);
run;
--
Paige Miller
ANKH1
Pyrite | Level 9

Thanks for your response. I tried using the code with that specific lambda but it showed the same error. 

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