Regression coefficients and coding di... PreviousNext
Mplus Discussion > Structural Equation Modeling >
 Xu, Man posted on Friday, February 01, 2013 - 5:55 am
This seems quite basic but I was puzzled by some analysis in relation to changes in coding directions of a predictor.

I have a continuous outcome variable y, and a predictor variable x which has three levels: 0, 1, 2.

I wanted to flip the direction of x and create a new variable called xr. I recode such that 0 in x now is 2 in xr, and 2 in x becomes 0 xr. Values of 1 remains the same.

I run two regression model, first with x as predictor of y, then with xr as preditor of y. I would expect coefficient of xr has the same magnitude as coefficient of x but with oppoisite signs, right?

But somehow these two are not exactly the same, although the signs are opposite.

I was just wondering, is this normal or might there be something wrong that I did?

 Linda K. Muthen posted on Friday, February 01, 2013 - 8:59 am
You should get the same coefficient value with the opposite sign. You either made a mistake in the recoding or the sample size changed for some reason.
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