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# st: How to find the best transformation for each variable in 120 periods

 From Xixi Lin To statalist Subject st: How to find the best transformation for each variable in 120 periods Date Fri, 22 Feb 2013 09:44:26 -0500

```Hi,

I am trying to find the best transformation for each variable in 120
periods. I know that command ladder gives the following result:
Transformation		formula		chi2(2)		P(chi2)
cubic		                Return^3		.		.
square		         Return^2		.		0.000
identity		         Return		64.81		0.000
square root		sqrt(Return)		.		.
log		                 log(Return)		.		.
1/(square root)		1/sqrt(Return)		.		.
inverse		         1/Return		.		.
1/square		        1/(Return^2)		.		.
1/cubic		        1/(Return^3)		.		.
.
How can I write a loop to find the best transformation fit for each
variable in 120 periods if available?

Thanks for any help!

Best,
Xixi Lin
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```