# st: Re: How to refer to the constant in a previously estimated regression?

 From "Martin Weiss" To Subject st: Re: How to refer to the constant in a previously estimated regression? Date Wed, 1 Jul 2009 22:06:49 +0200

```<>

***
sysuse auto, clear
reg pr we re tr
estimates save "modelA", replace
reg pr we re tr tu
estimates save "modelB", replace
clear*
sysuse auto, clear
est use "modelA"
predict newmodelA, xb
replace newmodelA=newmodelA-_b[_cons]
est use "modelB"
predict newmodelB, xb
replace newmodelB=newmodelB-_b[_cons]
***

HTH
Martin
_______________________
```
----- Original Message ----- From: "sdm1" <sdm1@york.ac.uk>
```To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, July 01, 2009 7:29 PM
```
Subject: st: How to refer to the constant in a previously estimated regression?
```

```
I'm using Stata 10. I've previously estimated a couple of regression models
```and have saved the model coefficients to a .ster file.  Now want to use
```
these model coefficients in conjunction with some new data to form predicted
```values.

I recall the old estimates using:

estimates use "modelA"
estimates store modelA

estimates use "modelB"
estimates store modelB

Then I use:

estimates for modelA: predict newmodelA, xb
estimates for modelB: predict newmodelB, xb

Both regression models included a constant and so the new sets of
predictions (newmodelA and newmodelB) both incorporate their respective
```
constants. However, I'd like to subtract the regression constant from both
```sets of predictions. In other words I'd like to:

gen prednoconsA=newmodelA - [constant from model A]
gen prednoconsB=newmodelB - [constant from model B]

```
How do I refer to [constant from model A] and [constant from model B] to do
```this?

Thanks.

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/

```
```
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```