# Re: st: how to interpret pooled dummy variable d91, d92....

 From "Joanne Marshall" <[email protected]> To [email protected] Subject Re: st: how to interpret pooled dummy variable d91, d92.... Date Sat, 20 Jan 2007 20:51:23 +0000

Dear Clive,

Thank you very much for advice, i know i am pushing it because i have an exam on Tuesday and so therefore i have been posting very often here. i understand no homework question should be asked here, i am going through the past paper and thought this could be a good source of help if i am stuck.

I hope i havnt offend anyone here, and in the future, i will ask question that is related the the program its own.

Cheers
Jo

```From: "Clive Nicholas" <[email protected]>
To: [email protected]
Subject: Re: st: how to interpret pooled dummy variable d91, d92....
Date: Sat, 20 Jan 2007 20:34:41 -0000 (GMT)

Joanne Marshall wrote:

> given the following results from stata,
>
> lwage (dependent variable is log of wage)
>
> educ 0.02
> d91    0.03
> d92   0.02
> d93  0.04
> d94    0.06
> con    0.33
>
> with base year of 1990, d91 being dummy variable for 1991 etc..
> for year 1991, the wage is increased by 3% than 1990
> for year 1992, the wage is increased by 2% than 1990 or 1991?
>
> thank you...
>
> my question here is that does the results refered of 1992, 1993 refer to
> the
> base year 1990, or the previous year?
>
> This is urgent, thank you very much.

The answer is straightforward: the coefficients for dummy variables are
all to be interpreted in comparison to the dummy variable left out of the
set, (i.e., 1990). Commonsense, if nothing else, should have told you
this.

I'd like to take the opportunity to nip some of your questions in the bud
with a little bit of friendly advice from someone who's been there before
you.

another member of Statalist for posting too many basic, homework-style
questions. If someone like myself or Maarten Buis can answer them, then I
guess we don't mind too much. But when you claim urgency (something that
is explicitly frowned upon in the FAQ, which you should (re-)read), you

Offending the very Statalisters you want help from is not the way to go:
take it from me! :)

CLIVE NICHOLAS        |t: 0(044)7903 397793
Politics              |e: [email protected]
Newcastle University  |http://www.ncl.ac.uk/geps

Whereever you go and whatever you do, just remember this. No matter how
many like you, admire you, love you or adore you, the number of people
turning up to your funeral will be largely determined by local weather
conditions.

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