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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: RE: Replacing the missing observations |

Date |
Thu, 17 Nov 2011 23:29:33 +0000 |

Sorry, but I don't understand what your problem now is or in what sense the results you show are wrong for the times you mention. -tsset- is certainly going to make no difference to the effects of the code I suggested as it makes no use of time series operators. Also, your query refers to calculations _for the same time_, which are nothing to do with time series operators. Nick On Thu, Nov 17, 2011 at 11:06 PM, Gokhan Yilmaz <yilmag@rpi.edu> wrote: > Thanks Dr. Cox, > > I ran the command as you suggested and read the FAQ. However, I could not > figure out why it worked for only some of the time values. It replaced a > zero for the ewdiffret instead of the actual values in 2007m6 through > 2007m12 and 2008m2. I had tsset the data but I also tried it after "tsset, > clear" and the same thing happened. For the other time values it worked > perfectly. Also it may seem like I am trying to replace for only one > observation in a given month but indeed there are around 345 observations > for each month to be replace with the same ewdiffret value in that given > month. > > > group time ewportret ewdiffret > 0 2007m4 .041679 > 1 2007m4 .0375245 -.0041545 > 0 2007m5 .0449738 > 1 2007m5 .0397919 -.0051819 > 0 2007m6 -.0240277 > 1 2007m6 -.0188678 .0051599 > 0 2007m7 -.064496 > 1 2007m7 -.0456775 .0188185 > 0 2007m8 .0023347 > 1 2007m8 .0104131 .0080783 > 0 2007m9 .0237398 > 1 2007m9 .0209782 -.0027617 > 0 2007m10 -.0086541 > 1 2007m10 .0190929 .0277471 > 0 2007m11 -.0589931 > 1 2007m11 -.0399782 .0190149 > 0 2007m12 -.0302353 > 1 2007m12 -.0077903 .022445 > 0 2008m1 -.0117908 > 1 2008m1 -.0418619 -.0300711 > 0 2008m2 -.0362031 > 1 2008m2 -.0311441 .0050591 > 0 2008m3 .0164306 > 1 2008m3 -.0015971 -.0180278 > > Regards, > > Gokhan > > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox > Sent: Wednesday, November 16, 2011 5:24 AM > To: 'statalist@hsphsun2.harvard.edu' > Subject: st: RE: Replacing the missing observations > > This is an FAQ. > > FAQ . . . . . . . . . . . . . . . . . . . . . . . Replacing missing > values > . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. > Cox > 9/05 How can I replace missing values with previous or > following nonmissing values or within sequences? > http://www.stata.com/support/faqs/data/missing.html > > In this example > > bysort time (ewdiffret) : replace ewdiffret = ewdiffret[1] > > Note that -replace- is a command (not a function). > > would work. > > Nick > n.j.cox@durham.ac.uk > > yilmag@rpi.edu > > group time ewportret ewdiffret > > 0 2007m4 .041679 . > 1 2007m4 .0375245 -.0041545 > 0 2007m5 .0449738 . > 1 2007m5 .0397919 -.0051819 > 0 2007m6 -.0240277 . > 1 2007m6 -.0188678 .0051599 > > The variable ewdiffret is the difference in ewportret between group 1 and > group 0 for each time variable (thanks to Dr. Cox for the help with this). > My question is how can i now replace all empty cells under the ewdiffret in > the same month with the single ewdiffret value in that given month. Indeed i > have too many empty cells in a given month and i want to replace them all > with the single ewdiffret i have for that month. > > For example: I would like to have the first empty cell under ewdiffret equal > to -.0041545 as the time variable for both is 2007m4 and the second empty > cell equal to -.0051819 as their time variable is 2007m5. Using too many > replace functions takes a long time and may cause transcription errors. > * * 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: Replacing the missing observations***From:*yilmag@rpi.edu

**st: RE: Replacing the missing observations***From:*Nick Cox <n.j.cox@durham.ac.uk>

**st: RE: RE: Replacing the missing observations***From:*"Gokhan Yilmaz" <yilmag@rpi.edu>

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