Just to add that I'm using version 8.2.
Louis

From: "louis boakye-yiadom" <louisby@hotmail.com>

Reply-To: statalist@hsphsun2.harvard.edu

To: statalist@hsphsun2.harvard.edu

Subject: st: the -missing- command

Dear All,

I have two questions regarding the -missing- command (or function?).

First question:

I'm not clear about exactly what -missing- does. An example will clarify my
concern. I have a dataset containing 11 variables (the first is -clust- and
the last is -s11aq13-). One of the variables is -trexpcd-, and the total
number of observations is 4872. I gave the following commands and had the
shown output:

count if mi(trexpcd)

4649

count if mi(clust-s11aq13)

82

My understanding of the online -help- is that -missing- evaluates the
number of observations for which any of the arguments is missing. So, for
the second command, since -trexpcd- is one of the arguments, I expected the
result to be a number which is at least equal to 4649.

Can anyone please show me what I'm missing?

Second question:

Also, I had the following result:

count if !mi(clust-s11aq13)

4790

Does !mi() evaluate the number of observations for which none of the
arguments is missing? Thank you.

Louis

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