[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

From |
Buzz Burhans <wsb2@cornell.edu> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: proportion of explained variance with log-transformed outcome |

Date |
Tue, 18 Nov 2003 09:03:36 -0500 |

If one estimates the proportion of explained variance for a model using a log transformed variable, is that proportion of explained variance approximately applicable to the untransformed variable ? In other words, if I derive the proportion of explained variance of a dependant variable in a logtransformed model associated with a predictor variable, does that variable also explain a similar proportion of the variance (not necessarily exactly the same) in the untransformed raw metric? I appreciate that the variance itself in the two metrics is different, but is the proportion of explained variance similar?

I have a model in which a treatment effect is significant, but explains little of the total variance. The model is run on transformed variables (log transformed outcome, and a fractional polynomial dependant time variable). Interpretation in practical terms should speak to this issue of minimal albeit significant treatment effect relative to contribution to the total variance, but I am not sure how to express this, or even if I can make any statement about it relative to the original raw metric since I modeled in the transformed metric.

Any insights would be most appreciated.

Buzz Burhans

Buzz Burhans

wsb2@cornell.edu

*

* For searches and help try:

* http://www.stata.com/support/faqs/res/findit.html

* http://www.stata.com/support/statalist/faq

* http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**st: RE: proportion of explained variance with log-transformed outcome***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**st: Re: the demise of cmdname and naming conventions***From:*Christopher F Baum <baum@bc.edu>

- Prev by Date:
**Re: st: Replace for a group of variables** - Next by Date:
**st: RE: RE: algebraic with missings** - Previous by thread:
**st: Re: the demise of cmdname and naming conventions** - Next by thread:
**st: RE: proportion of explained variance with log-transformed outcome** - Index(es):

© Copyright 1996–2023 StataCorp LLC | Terms of use | Privacy | Contact us | What's new | Site index |