Rajesh Tharyan wrote:
> I have the following file
>
> Year id X Y
> 986 6215 1 .645
> 1986 1781 1 .778
> 1986 2774 1 .819
> .....................
> 1986 817 10212 .962593
>
> The actual file has about 250 observations.
>
> I have created 25 gps based on quintiles of X and Y as follows
>
> year Id X Y X-Quntile Y-Quntile Group
> 1986 817 10212 .962593 1 3 13
> 1986 2675 4930 .7089249 1 1 11
> 1986 753 4617 .7927225 1 2 12
> 1986 433 3271 .9935799 1 3 13
> 1986 2227 3076 .6346879 1 1 11
> 1986 3701 2497 1.189828 1 4 14
>
> Now I append another observation to the dataset
>
> Say
>
> Year id X Y
> 1986 230 62 .95
>
> How can I allocate this to the appropriate group?
>
> Note, I cannot include the new case in the first instance that I form the
> groups.
How about:
. use file1
. gen oldfile = 1
. pctile xq = x, nq(5)
. pctile yq = y, nq(5)
. append newfile
. xtile newxq = X if mi(newfile), cutpoints(xq)
. xtile newyq = Y if mi(niewfile), cutpoints(yq)
. replace group = (newxq * 10) + newyq
--
Ulrich Kohler
[email protected]
030/25491-361
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