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can you hepl me Mr Gareth.

I still don't follow what you're trying to do.

sorry! this is my workfile, i hope that you understand me what i mean. just i would to generate trend and dummy for different frequency.
it's very important for me Mr Gareth.

many thanks in advance.

Still not clear.

see the picture

and this

Showing pictures isn't asking a question...

But I think at least one of your columns is just the @month variable.

question: generate trend and dummy for different frequency.
1-interday:
genr trend (t1): from 03/01/2000 08:00 to 03/01/2000 10:00 take 1
from 04/01/2000 08:00 to 04/01/2000 10:00 take 2. and so on

genr trend (2): from 03/01/2000 08:00 to 03/01/2000 10:00 take 1 2 3 4 5.
from 04/01/2000 08:00 to 04/01/2000 10:00 take 1 2 3 4 5. and son on

genr dum1: the first 03/01/2000 08:00 and the last 03/01/2000 10:00 take 1
the first 04/01/20000 08:00 and the last 04/01/2000 10:00 take 1. and so on

2-daily
genr trend (t3): the first month take 1, the second month take 2, the third month take 3...etc

genr trend (t4): the first month take 1 2 3...29, the second month take 1 2 3...29, the third month take 1 2 3...31,...and son on

3-weekday
genr trend (t5): the first month take 1 next month take 2 and so on

genr trend (t6): the first month take 1 2 3...5, the second month take 1...4, and son on.

4-tenday
genr trend (t7): the first month take 1 next month take 2 and so on

genr trend (t8): the first month take 1 2 3 next month take 1 2 3 and so on

genr dum2: the first tenday and the last take 1 for every month.

5-fortnight
genr trend (t9): the first month take 1 next month take 2 and so on

genr trend (t10): the first month take 1 2 3 next month take 1 2 and so on

genr dum3: the first and last fortnight take 1 for every months.

A few of these will have issues at the start of the workfile, but:


1-Interday: 2-daily: 3-weekday:
That should get you doing, anyway

problem
1-inraday:
the code for dum1 generate trend for the first year, it not continue for the second year 2001 it repeat. 2-daily:
same problem for the code dum1 (and same problem for fortnight & tenday) 3-weekday:
A- same problem for the code dum1 (and same problem for fortnight & tenday) B- when i une the code for dum2 it chow error message '' dum is not defined " 4- when i use the code for dum2 (tenday & fortnight) it not generate trend for example: frequency tenday
11/01/2000 take 11 it should equal 2.
21/01/2000 take 21 it should equal 3.

can you help me Mr Gareth.

That's pretty general, and will solve the intraday. For the monthly ones, change the "d" to an "m".

thanks a lot,
this code for dummy chow error message what can i do.

series dum2= @recode(@month<>@month(-1), 1, dum2(-1)+1)

thanks for your help. :D