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From |
"Masci, Pietro" <PIETROM@iadb.org> |

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

Subject |
RE: st: Generate data and matrix from unbalanced panel |

Date |
Mon, 30 Jul 2007 11:20:29 -0400 |

I am trying to locate a book on time series with stata: "An Introduction to Forecasting Time Series Using Stata" by Robert Yaffee. Does anyone know if this book is available? -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of n j cox Sent: Monday, July 30, 2007 10:56 AM To: statalist@hsphsun2.harvard.edu Subject: Re: st: Generate data and matrix from unbalanced panel Others have addressed part of this. I just want to comment on the example code: sort ID by ID: egen pd= count(var1) sort pd by pd: egen Np= count(pd) replace Np= Np/pd gsort pd ID year If I understand the sort order wanted, it is achieved by bysort ID : gen pd = _N sort pd ID yr Occasionally, -egen, count()- and this more direct method give different answers when there are missing values. Nick n.j.cox@durham.ac.uk Nguyen Cong Minh I have the unbalanced panel data like this: Id yr var1 var2 var3 1 1991 2 3 4 1 1992 32 32 22 1 1993 32 2 23 2 1992 21 32 32 2 1993 32 49 88 3 1991 22 32 34 3 1992 32 87 76 3 1993 33 32 43 4 1991 3 44 33 5 1993 32 33 32 . .. .. .. .. I would like to transform the data into new one (sorted by the number of years that we observed the ID i) Id yr var1 var2 var3 4 1991 3 44 33 5 1993 32 33 32 2 1992 21 32 32 2 1993 32 49 88 1 1991 2 3 4 1 1992 32 32 22 1 1993 32 2 23 3 1991 22 32 34 3 1992 32 87 76 3 1993 33 32 43 I know how to transform to this data in Stata: sort ID by ID: egen pd= count(var1) sort pd by pd: egen Np= count(pd) replace Np= Np/pd gsort pd ID year But I don't know how to write a program can do this transformation and give me pd and Np into vector pd[.,1], Np[.,1], (in this example, pd[]=(1 2 3)' and Np[]=(2 1 2)').And how I can use pd[.,1], Np[.,1] to partition the whole transformed matrix [Id yr var1 var2 var3] into blocks(i) [Id yr var1 var2 var3] with rows = pd[i,1]*Np[i,1]? * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Yaffee time series text [was: RE: st: Generate data and matrix from unbalanced panel]***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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