st: loop for bootstrap ?

[econqian222 <maguixianstatalist@gmail.com>]

Dear all
     I want to run a bootstrap by product(1,2,3,...) , the command is
written as:
     bysort product: bootstrap rmse=e(rmse), reps(100) seed(12345): regress
value quantity index
     unfortunately, the program can't run successfully.

the format of the data goes as following
product   quantity        value       index
> 1                5.605  .064            7
> 1              27.3518  3.96556      3
> 1             2.76541   .597           6
> 2             727.906   77.711       12
> 2             396.779   82.386       18
> 3             35.8568   .783239      4
> 3             19.6898   .128481      3

If this bootstrapping method can't be combined with "bysort", then How to
write a loop for this bootstrap?

Many thanks
Qian


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