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[ferret_users] qhat problem after linear regression



Dear Users,

my original data set is of x-y and t axes. I execute linear regresison along t axis.

let p=t[gt=var]
let q=var
go regresst

With this script i create a variable "qhat". Which is the equation of the linear trend (let qhat = slope*p + intercep).
If i list qhat for the whole time and for the selected period, i get different results (see below). qhat for the whole time has the correct values, but i only want some selected to be listed or work with.

Does someone know what could be the problem?
Many thanks, Peter

-------------------
list qhat[l=1:10]
1    /  1:  3.091
 2    /  2:  2.982
 3    /  3:  2.873
 4    /  4:  2.764
 5    /  5:  2.655
 6    /  6:  2.545
 7    /  7:  2.436
 8    /  8:  2.327
 9    /  9:  2.218
 10   / 10:  2.109
list qhat
 1    /  1:  2.383
 2    /  2:  2.416
 3    /  3:  2.449
 4    /  4:  2.482
 5    /  5:  2.515
 6    /  6:  2.548
 7    /  7:  2.580
 8    /  8:  2.613
 9    /  9:  2.646
 10   / 10:  2.679
 11   / 11:  2.712
 12   / 12:  2.745
 13   / 13:  2.778
 14   / 14:  2.811
 15   / 15:  2.844
 16   / 16:  2.877
 17   / 17:  2.910
 18   / 18:  2.943
 19   / 19:  2.976
 20   / 20:  3.009
 21   / 21:  3.041
 22   / 22:  3.074
 23   / 23:  3.107
 24   / 24:  3.140
 25   / 25:  3.173
 26   / 26:  3.206
 27   / 27:  3.239
 28   / 28:  3.272
 29   / 29:  3.305
 30   / 30:  3.338
 31   / 31:  3.371
 32   / 32:  3.404
 33   / 33:  3.437
 34   / 34:  3.470
 35   / 35:  3.502
 36   / 36:  3.535
 37   / 37:  3.568
 38   / 38:  3.601
 39   / 39:  3.634
 40   / 40:  3.667

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