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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: Re: sum of missing values returned as zero |

Date |
Sat, 4 Oct 2008 00:50:26 +0200 |

Note -egen, total- where you can add the -missing- option to toggle this behavior back and forth...

HTH

Martin

_______________________

----- Original Message ----- From: "Jacob Wegelin" <jwegelin@vcu.edu>

To: <statalist@hsphsun2.harvard.edu>

Sent: Saturday, October 04, 2008 12:44 AM

Subject: st: sum of missing values returned as zero

The following code

clear set obs 4

gen Finished=.

list

summarize Finished

return list

returns a value of zero for the sum of Finished, as is seen below. I do not understand. I would think that the sum of a list of numbers, at least one of which is missing, would be missing, not zero. Can someone explain?

. set obs 4

obs was 0, now 4

. gen Finished=.

(4 missing values generated)

. list

+----------+

| Finished |

|----------|

1. | . |

2. | . |

3. | . |

4. | . |

+----------+

. summarize Finished

Variable | Obs Mean Std. Dev. Min Max

-------------+--------------------------------------------------------

Finished | 0

. return list

scalars:

r(N) = 0

r(sum_w) = 0

r(sum) = 0

Thanks

Jacob A. Wegelin

jwegelin@vcu.edu Assistant Professor

Department of Biostatistics

Virginia Commonwealth University

730 East Broad Street Room 3006

P. O. Box 980032

Richmond VA 23298-0032

U.S.A. http://www.people.vcu.edu/~jwegelin

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**References**:**st: sum of missing values returned as zero***From:*Jacob Wegelin <jwegelin@vcu.edu>

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