[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

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

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: the -missing- command |

Date |
Mon, 10 Oct 2005 15:06:59 +0000 |

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

*

* For searches and help try:

* http://www.stata.com/support/faqs/res/findit.html

* http://www.stata.com/support/statalist/faq

* http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: the -missing- command***From:*"louis boakye-yiadom" <louisby@hotmail.com>

- Prev by Date:
**RE: st: variable starting point in 'forvalues'** - Next by Date:
**Re: st: Nonlinear regression** - Previous by thread:
**st: Re: Rép. : Re: st: Listtex: headlines a nd append** - Next by thread:
**RE: st: the -missing- command** - Index(es):

© Copyright 1996–2015 StataCorp LP | Terms of use | Privacy | Contact us | What's new | Site index |