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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