On my Stata 10.1 this is in help for -whatsnew7to8-. In bw's Stata, I
guess it's in help for -whatsnew7to8- too.
Stata now has multiple missing values! In addition to the
previously existing ., there is now .a, .b, ..., .z, and you
can attach value labels to the new missing codes!
One thing to watch out for: Do not type
. stata_command ... if x != .
Instead, type
. stata_command ... if x < .
You need remember this only if you use the new missing values,
but better to have good habits. The way things now work,
all numbers < . < .a < .b < ... < .z
So, if you wanted to list all observations for which x is
missing, you would type
. list if x >= .
See help missing.
Nick
[email protected]
Nick Cox
Nothing to do with either -edit- or -if- or -&-.
The problem, as declared, is a type mismatch.
As -plannedsx- is float it can never be equal to an empty string.
-if plannedsx < .- would be one good way to test whether it was not
missing.
(I think Stata 8.2 had extended missing values .a ... .z already, so
!= .
and
< .
are not the same.) Tony Lachenbruch got a very useful publication in the
early STB out of explaining that < . was shorter than != . but with
extended missing values his short-cut really came into his own.
STB-9 ip2 . . . . . . . . . . . . . . . . . . . . . . . A keyboard
shortcut
. . . . . . . . . . . . . . . . . . . . . . . . . . P. A.
Lachenbruch
9/92 p.9; STB Reprints Vol 2, p.46 (no
commands)
keyboard shortcut to indicate nonmissing values
Also, check out the -missing()- function. It may have been called
-miss()- in Stata 8.2.
... if !missing(plannedsx)
is how you could do it in Stata 10.
Nick
[email protected]
b. water
Stata 8.2,
I wanted to do this:
edit if plannedsx!="" & modalit==""
i.e. i wanted to edit those where plannedsx are not missing but where
modality are missing
and received this message:
type mismatch
r(109);
The variables descriptions are:
storage display value
variable name type format label variable label
------------------------------------------------------------------------
-------
plannedsx float %9.0g planndsx
modalit byte %1.0f electrosx
Questions are:
1. How I can achieve what I wanted to do?
2. I would appreciate confirmation of this situation: I tried another
edit with if and & using another conditions and variables, these few
attempts returned the same type mismatch error r(109) - so I presumed
edit with if and & is not a legal syntax.
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