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From |
Richard Goldstein <richgold@ix.netcom.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: RE: Replace missing values by 0 |

Date |
Tue, 10 Aug 2010 12:56:32 -0400 |

be careful -- while what you say is true, you also won't be asked if you were happy doing "x" -- and 0 is not correct for that I definitely agree with Tony that just mindlessly doing what the OP asked is very dangerous Rich On 8/10/10 12:13 PM, David Bell wrote: > - > In many cases, skip patterns in questionnaires leave behind missing values, either -9's or .'s. If you told the interviewer that you didn't do behavior X in the past year, you won't be asked how many times you did X in the past 30 days. The missing value for 30-day behavior X really does represent a zero. > > Dave > ==================================== > David C. Bell > Professor of Sociology > Indiana University Purdue University Indianapolis (IUPUI) > (317) 278-1336 > ==================================== > > > > > On Aug 9, 2010, at 6:29 PM, David Radwin wrote: > >> Tony, >> >> Sometimes data, especially count data, are stored in a spreadsheet where a >> blank cell indicates a zero value. For example, if the data are >> hand-entered and there are a lot of zero values, it is more efficient not >> to enter a zero, and many spreadsheet functions treat the blank cell as a >> zero value. >> >> However, if you paste or -insheet- these data into Stata, the blank cells >> are encoded as missing values. In this case it is necessary to convert the >> missing values to zeroes. >> >> David >> >> -- >> David Radwin >> Research Associate >> MPR Associates, Inc. >> 2150 Shattuck Ave., Suite 800 >> Berkeley, CA 94704 >> Phone: 510-849-4942 >> Fax: 510-849-0794 >> >> www.mprinc.com >> >> >>> -----Original Message----- >>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- >>> statalist@hsphsun2.harvard.edu] On Behalf Of Lachenbruch, Peter >>> Sent: Monday, August 09, 2010 2:59 PM >>> To: 'statalist@hsphsun2.harvard.edu' >>> Subject: st: RE: Replace missing values by 0 >>> >>> In all of the discussion of this query, nobody has asked why it is >>> important to do this? If you are computing means, the 0 values will >>> distort the mean (or median if enough), and if you simply want to ignore >>> zeros with "if x~=0") retaining the missing value will do this >>> automatically. >>> >>> I am unsure if I've ever had a reason to convert missing values to a >>> numeric value, but have had many times when the -9 for missing (or >>> whatever) had to be set to "." >>> >>> Tony >>> >>> Peter A. Lachenbruch >>> Department of Public Health >>> Oregon State University >>> Corvallis, OR 97330 >>> Phone: 541-737-3832 >>> FAX: 541-737-4001 >>> >>> >>> -----Original Message----- >>> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- >>> statalist@hsphsun2.harvard.edu] On Behalf Of Hobst >>> Sent: Monday, August 09, 2010 1:55 AM >>> To: statalist@hsphsun2.harvard.edu >>> Subject: st: Replace missing values by 0 >>> >>> I have two variabled called "prean" and "pa_kum" that contain missing >>> values. >>> These missing values i would like to replace by 0 (zero). What command >> can >>> i >>> use to do this? >>> >>> Thanks in advance for your support. Regards >>> -- >>> View this message in context: >>> http://statalist.1588530.n2.nabble.com/Replace-missing-values-by-0- >>> tp5388239p5388239.html >>> Sent from the Statalist mailing list archive at Nabble.com. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Replace missing values by 0***From:*Hobst <tobias.friedli@access.uzh.ch>

**st: RE: Replace missing values by 0***From:*"Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>

**st: RE: RE: Replace missing values by 0***From:*"David Radwin" <dradwin@mprinc.com>

**Re: st: RE: RE: Replace missing values by 0***From:*David Bell <dcbell@iupui.edu>

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