-if- regression

[Adnan Anwar]

Dear Statalists,

I need to run a regression for specific range of year (94-96). Can I use -if-?
Already generated dummy variable: post93=(year>1993).

For example:

Regress var1 var2, if(post93==1)

Regards.

[Christian Otchia]

You don't need to create a new variable. Use instead if inrange(year,94,96).
For example:
regress var1 var2 if inrange(year,94,96)

[Adnan Anwar]

Thank you for your reply.

I created the new variable because the question asked me to.

Cheers,
Was really helpful.

[Nick Cox]

Note further that if your selected data are for 1994-1996 then any indicator for 1994 or more is identically 1 and so useless for regression.

[Martin Euwe]

Is there a way that the output for all different ranges will be in 1 table? I need to do the same for 25 ranges of data but Stata will give me 25 output tables.

With the dots in the center being the coefficients.

[Marcos Almeida]

For example:
Regress var1 var2, if(post93==1)

There are several issues on the command showed in #1.

First, it is - regress -, not Regress.

Second, you are supposed to use the -if- clause before the comma, not afterwards.

Third, there is not need to use the parenthesis.

These reasons being remarked, such a command is not bound to work properly.

[Martin Euwe]

Dear Marcos,

Thank you for your answer. Do you also have an answer for the question in #5? When using inrange (yr, 1980, 1983) the output will of course be in one table. However, my goal is to have a table with the coefficients for multiple ranges as shown in #5 without having to copy the content in a new table.

Kind regards,

Martin Euwe

[Marcos Almeida]

You may wish to create a 'range variable', then - regress - under -bysort- , use estimates store, then type -estimates table - command.