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Re: Missing values [was: RE: st: simple question]
At 10:18 PM 6/2/2004 +0100, Nick Cox wrote:
Sure. What I dislike is that, unlike other programs, Stata forces you to
recode the MD values from a data set. All those 7s, 9s, 99s, etc. will
have to be recoded to .a, .b, etc. The values you use for MD will not be
the same as the values in the published codebooks or that may be reported
by other users of the data who are using other programs.
Perhaps you could expand on this.
In SPSS, on the other hand, I would just say something like
Missing Values X (77, 88, 99).
This isn't a mega problem, but when Stata expanded its possible MD codes
I'd have rather seen it take an SPSS-type approach than the route it did
go. (On the other hand, I suppose you could argue that the rest of the
world should do things more like Stata.)
The bigger problem (which is perhaps more of an issue with Stat/Transfer
than it is with Stata) is that distinctions between types of MD codes get
lost when converting from SPSS to Stata. I don't know whether this problem
is unique to Stata or occurs with other types of conversions as well, but I
would like to see software better address it, e.g. when there are multiple
MD codes in SPSS assign them to .a, .b, etc. in Stata.
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