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Re: st: How to drop observations according to date?

From   Nick Cox <>
To   "" <>
Subject   Re: st: How to drop observations according to date?
Date   Fri, 21 Jun 2013 14:53:05 +0100

consequence of a display format.

These are monthly dates so

... if date < ym(2000, 1)

will be one solution.

I find out about functions such as -ym()- not by Googling but by
looking at the help. I know that there will be functions that yield
monthly dates as results, which will solve the problem. -help
functions- is where I start.

The fact is that dates and times are a proverbial pain whatever you
do; but it's all documented.


On 21 June 2013 14:30, Edward Crawley <> wrote:
> Dear listers,
> I have a panel dataset and I would like to drop all observations,
> which are dated before 2000m1. I used -drop if date < 2000m1-, but
> Stata doesn't understand this command. My date variable is identified
> as a panel data date via -xtset-.
> It seems like a very easy question, but I couldn't figure it out and I
> couldn't find proper solutions on the internet.
> Appreciate any help,
> Edward
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