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From |
"Fernando Rios Avila" <f.rios.a@gmail.com> |

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

Subject |
RE: st: RE: limitations of "generate" with missing data |

Date |
Mon, 11 Apr 2011 18:19:17 -0400 |

Apologies, it was a typo > set obs 1000 > gen r=runiform() > replace r=. if runiform()>.5 > gen r2=r>0.7 if r!=. -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox Sent: Monday, April 11, 2011 6:18 PM To: statalist@hsphsun2.harvard.edu Subject: Re: st: RE: limitations of "generate" with missing data What is r1? On Mon, Apr 11, 2011 at 11:09 PM, Fernando Rios Avila <f.rios.a@gmail.com> wrote: > Hi Michael, > The limitation is not with generate. But rather with the way u are > creating your dummy variable I think this should do the trick > > set obs 1000 > gen r=runiform() > replace r=. if runiform()>.5 > gen r2=r>0.7 if r1!=. > > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Michael > Costello > Sent: Monday, April 11, 2011 6:01 PM > To: statalist > Subject: st: limitations of "generate" with missing data > > Statalisters, > > I recently ran into a problem with the following dataset: > > . tab gread_comp_score_pcnt, m > gread_comp_ | > score_pcnt | Freq. Percent Cum. > ------------+----------------------------------- > 0 | 150 7.50 7.50 > .2 | 85 4.25 11.75 > .4 | 97 4.85 16.60 > .6 | 82 4.10 20.70 > .8 | 72 3.60 24.30 > 1 | 15 0.75 25.05 > . | 1,499 74.95 100.00 > ------------+----------------------------------- > Total | 2,000 100.00 > > The high number of "missing" is by design, a by-product of a > horizontally structured dataset that I have yet to rectify. > > When I run the command: > gen gread_comp_score_pcnt80= (gread_comp_score_pcnt>.79) I am left > with > > . tab gread_comp_score_pcnt80, m > gread_comp_ | > score_pcnt8 | > 0 | Freq. Percent Cum. > ------------+----------------------------------- > 0 | 414 20.70 20.70 > 1 | 1,586 79.30 100.00 > ------------+----------------------------------- > Total | 2,000 100.00 > > As you can see, the 87 values above .79 were set to 1, but so were all > the missing values!! I have toyed with the code a bit, trying > variations such as . gen gread_comp_score_pcnt80= > (gread_comp_score_pcnt>.79 & > gread_comp_score_pcnt!=.) > but that converts all the missing to 0's, which is only marginally better. > > So the question is, is there some way to use a single, precise line of > code to create eighty-seven 1's, four hundred fourteen 0's and 1499 > Missing values in one dummy variable? I know I can do it with several > lines of code, but I'm looking for something more concise, as it needs > to run many hundreds of times. > * * 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/ * * 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: limitations of "generate" with missing data***From:*Michael Costello <michaelavcostello@gmail.com>

**st: RE: limitations of "generate" with missing data***From:*"Fernando Rios Avila" <f.rios.a@gmail.com>

**Re: st: RE: limitations of "generate" with missing data***From:*Nick Cox <njcoxstata@gmail.com>

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