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Re: st: Version control question
Thanks Ken (and Richard) - that's very helpful.
> "Mark Schaffer" <M.E.Schaffer@hw.ac.uk> asks:
>> Under Stata 9.0 and earlier, up to 20 estimation results could be stored
>> using -estimates store-.
>> Under Stata 9.1, this limit has been increased to 300 estimation
>> If I have a program that starts with, say, -version 8.2-, and I run it
>> under Stata 9.1, will the maximum number of estimation results that the
>> program can store be 20 or 300?
> Your old program (with a -version- statement less than 9.1) run
> in a modern Stata version 9.1 will allow the 300 estimation
> results to be stored. Setting the -version- to a smaller number
> does not turn off this new feature.
> Having an older -version #- statement does not turn off the new
> features introduced in later versions. It only changes the
> behavior of commands for those limited cases where version
> controlling is really needed. Take a look at
> -help version-
> and scroll down to the section titled "Summary of version
> changes" about a third of the way down the file. This section
> lists what behavior differs based on the -version- you set in
> your program.
> Here are some guidelines on what setting -version #- does and
> does not do:
> 1) When the syntax of a command changes so that the old and
> new syntaxes are NO LONGER COMPATIBLE, then setting
> -version #- to the older version makes the command
> understand the older syntax. Otherwise the new syntax is
> For many of the commands that we alter, the old and new
> syntaxes do not conflict and both continue to be
> understood (but only the new syntax continues to be
> 2) If you place an older version number at the top of a
> command or do file, it does not keep you from using more
> modern features (except in those few cases where version
> control had to be imposed, see #1).
> Sometimes people think that if they are running Stata 9.1
> and they place a -version 8- at the top of a program or do
> file, get it running in their modern Stata, and then give
> it to someone who only has Stata 8 (has not purchased
> Stata 9) that the person using Stata 8 will be able to run
> the program or do file. The Stata 8 user will only be
> able to run it if you avoid all the new commands and
> language features found in your more modern Stata.
> 3) We do not version control buggy behavior.
> I don't think anyone would want us to restore a bug when
> -version- is set to an older number -- and we do not.
> 4) We USUALLY do not version control output style
> modifications. For instance, if we make the output of a
> command look nicer (use smcl, clickable links in the
> output giving additional help of information, slight
> changes in the spacing of the columns, ...), the nicer
> look happens regardless of the -version #- setting.
> Ken Higbee firstname.lastname@example.org
> StataCorp 1-800-STATAPC
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Prof. Mark Schaffer
Department of Economics
School of Management & Languages
Heriot-Watt University, Edinburgh EH14 4AS
tel +44-131-451-3494 / fax +44-131-451-3294
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