Issues with Lincom command

[Matthew Gomez]

Hello,
I posted this question a few days ago, and I am trying to use the lincom command to find the P-test, t-test, confidence interval and coefficient between two variables. This is actually for a Stata-led statistics class as I am a Ph.D. student. All the lincom examples given in the text and the variables asked in the homework all result in the same error. Below is my Do-file for an example:

mean egalitarianism [pw=nesw], over(Female)
lincom [egalitarianism]Male - [egalitarianism]Female

However, with lincom I continue to get the same error command:

equation [egalitarianism] not found
r(303);

Does anyone have suggestions I may use to find the same needed results without using the lincom command?

[Carlo Lazzaro]

Matthew:
in all likelihood, you did not receive any reply because posting and replying to class/homework queries in discouraged on this forum (see the FAQ).
FAQ also report how to post Stata (and statistics)-related questions effectively..
That said, with the following toy-example, I cannor replicateyour problem:

. use "C:\Program Files (x86)\Stata15\auto.dta"
(1978 Automobile Data)

. mean price [pw=weight ], over( foreign )

Mean estimation                   Number of obs   =         74

     Domestic: foreign = Domestic
      Foreign: foreign = Foreign

--------------------------------------------------------------
        Over |       Mean   Std. Err.     [95% Conf. Interval]
-------------+------------------------------------------------
price        |
    Domestic |   6500.577   503.7304      5496.644     7504.51
     Foreign |   6799.051   663.8892      5475.922    8122.181
--------------------------------------------------------------

. lincom [price]Domestic- [price]Foreign

 ( 1)  [price]Domestic - [price]Foreign = 0

------------------------------------------------------------------------------
        Mean |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
         (1) |  -298.4742   833.3626    -0.36   0.721    -1959.363    1362.415
------------------------------------------------------------------------------

.

[Matthew Gomez]

Thank you for the response and clarification