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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

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

Subject |
st: RE: regression on variable over time to get mean autoregressive parameter |

Date |
Tue, 7 Oct 2008 23:50:16 +0200 |

" especially how to get the mean of the different regressions and on how to refer to the last observation": Not quite sure why you want a mean, but if you want to record results from multiple regression, either look at - h postfile- or -estimates store- Referring to the last observation is as easy as the qualifier -in `=_N'- HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Fabian Brenner Sent: Tuesday, October 07, 2008 10:25 PM To: statalist@hsphsun2.harvard.edu Subject: st: regression on variable over time to get mean autoregressive parameter Dear all: I have observations for different years ("year" 1990-2000) for bacterias ("bacteria_name", eg.ATT, GLY, ...) and the number of the bacteria population ("number"). Now I would like to run the following regression: number (year+1) = w0 + w1 * number (year) + e for every two consecutive years (whenever there are values for at least two consecutive years for a given bacteria_name) to get mean estimates of the parameters w0 and w1 (w1 should reflect the fade rate of the bacteria population). I hope someone has a solution or can give me a hint to solve this problem. I tried it many times but I did not found a solution (especially how to get the mean of the different regressions and on how to refer to the last observation)..Thanks a lot. Fabian Brenner My data looks like the following (using -sort bacteria_name year-) bacteria_name year number ATT 1990 10 ATT 1991 3 GLY 1993 4 SIS 1992 99 SIS 1993 19 SIS 1994 8 X 1995 2 . -- Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger * * 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: regression on variable over time to get mean autoregressive parameter***From:*"Fabian Brenner" <Fabian.Brenner@gmx.de>

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