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st: A calculation problem


From   "Jia Xiangping" <jiajoseph@googlemail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: A calculation problem
Date   Tue, 26 Sep 2006 04:44:43 +0800

Dear friends,

I have been annoyed by one problem for several days, and I am unable
to work it out. Sincerely wish you can give me a hand. I believe after
suffering from this, I can expect some improvement.


obs v25 v38  v51 v64 p25  p38  p51  p64
1    01   12  39        0.7   1.8   0.6   0.5
2    01   19  21         .     1.6   0.8   0.7
3    01   34  19        0.6   .      0.6    0.7
4    09   19  01        1.5   0.9   0.9
5   19    25  07
6   12    31
7   25



While v25 v38 v51……stand for the code of different crops, p25 p38
p51…stand for the correspond price. Things become remarkably tricky
when some price are missing. For example, crop 01 has price 0.7 in
observation 1, but price is missing in observation 2.

Now I want to calculate the average price of different crops. Is that
possible? I am now like an ant on hot brick.


--
Xiangping JIA

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