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From |
"Rivera, Paul A." <riveraecon@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Backfill Missing Values |

Date |
Fri, 17 Apr 2009 07:39:20 -0700 |

Thanks to all for the help!

Thanks again, Paul Nick Cox wrote:

David Kantor gave another good answer to the same effect.As a footnote: The whole area, including the reversing time trick, is covered in an FAQFAQ . . . . . . . . . . . . . . . . . . . . . . . Replacing missing values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox 2/03 How can I replace missing values with previous or following nonmissing values? http://www.stata.com/support/faqs/data/missing.html-search missing- would have pointed to this.Nickn.j.cox@durham.ac.ukAustin Nichols Something like this? clear input year gdpReal gdpNom gdpdefl PPI dPPI 1900 126 . . 25 . 1901 132 . . 27 .08 1902 138 . . 29 .074 1903 142 . . 31 .069 1904 147 41.16 28 32 .032 1905 150 48 32 34 .063 1906 151 49.83 33 35 .029 end g id=1 g neg=-year tsset id neg gen g=gdpdefl replace g=l.g/(1+l.dPPI) if mi(g) g gdpnom=gdpReal*(g/100) tsset id year l, noo sep(0) On Thu, Apr 16, 2009 at 7:46 PM, Rivera, Paul A. <riveraecon@gmail.com> wrote:I have a panel dataset that looks something like this: year gdpReal gdpNom gdpdefl PPI dPPI 1900 126 . . 25 1901 132 . . 27 .08 1902 138 . . 29 .074 1903 142 . . 31 .069 1904 147 41.16 28 32 .032 1905 150 48 32 34 .063 1906 151 49.83 33 35 .029 The variable I need is gdpNom. Normally, one would obtain this as: gdpNom = gdpReal * (gdpdefl/100); however, this is clearly not possible since gdpdefl is missing anywhere gdpNom is missing. So, I want to estimate gdpdefl using dPPI, something like this: gen gdpdeflFILL = F.gdpdefl/(1+F.dPPI) if gdpdefl==. gen gdpdeflEST = gdpdefl replace gdpdeflEST = gdpdeflFILL if gdpdeflEST==. This would allow me to estimate gdpNom: gen gdpNomEST = gdpnom replace gdpNomEST = gdpReal * (gdpdeflEST/100) if gdpNomEst==. BUT, my brilliant plan falls apart because the forward lag operator (F) cannot cascade the same way that the backward lag operator (L) can, so I only, for example, get an estimate for 1903. I feel like there must be an easy solution to this, but I am stuck. My panel has 57 groups and 150 time periods, so I'd much rather not do this by hand.* * 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: Backfill Missing Values***From:*"Rivera, Paul A." <riveraecon@gmail.com>

**Re: st: Backfill Missing Values***From:*Austin Nichols <austinnichols@gmail.com>

**RE: st: Backfill Missing Values***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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