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From |
David Kantor <kantor.d@att.net> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Re: Comparing datasets |

Date |
Tue, 16 Sep 2008 00:25:54 -0400 |

Following Eva's suggestion, you don't need to -use- a dataset to get its variables:

des somedataset, varlist

local first `r(varlist)'

des someotherdataset, varlist

local second `r(varlist)'

(You can put in -quietly:- if you like.)

This can be followed by Eva's comparison of first and second, or you can use macrolists:

local first_not_second : list first - second

local second_not_first : list second - first

disp "not present in the first file: `first_not_second'"

disp "not present in the second file: `second_not_first'"

(Actually, that can be condensed further, but I'll let that go for now.)

See -help macrolists-.

----

On -cf-, another disadvantage in this situation is that it requires the same number of observations in each dataset.

HTH

--David

At 05:18 PM 9/15/2008, you wrote:

If you use -cf- you have to use it in both directions, to be on the safe side. However, -cf- compares all values as well, which will clutter the output considerably if these are actually two different datasets with the same variable names. Here is a way to avoid this problem. The example uses the auto data. **** sysuse auto, clear drop foreign save myauto1 sysuse auto, clear drop price head save myauto2 qui ds local second `r(varlist)' use myauto1, clear qui ds local first `r(varlist)' foreach x of local first { if strpos("`second'","`x'") == 0 { di in yellow "`x' is not present in the second file." } } foreach x of local second { if strpos("`first'","`x'") == 0 { di in yello "`x' is not present in the first file." } } [...]

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**Follow-Ups**:**Re: st: Re: Comparing datasets***From:*"Raphael Fraser" <raphael.fraser@gmail.com>

**References**:**st: Comparing datasets***From:*"Raphael Fraser" <raphael.fraser@gmail.com>

**st: Re: Comparing datasets***From:*Martin Weiss <mw.stlist@googlemail.com>

**Re: st: Re: Comparing datasets***From:*"Eva Poen" <eva.poen@gmail.com>

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