" 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: [email protected]
[mailto:[email protected]] On Behalf Of Fabian Brenner
Sent: Tuesday, October 07, 2008 10:25 PM
To: [email protected]
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
.
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