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Re: st: capturing the sizes of the sequences of countinous (uninterrupted) values equal to 1
From
massimiliano stacchini <mastacchini@yahoo.it>
To
statalist@hsphsun2.harvard.edu
Subject
Re: st: capturing the sizes of the sequences of countinous (uninterrupted) values equal to 1
Date
Thu, 1 Dec 2011 10:20:39 +0000 (GMT)
Thanks a lot,
If I run the codes that you suggeted me the result is ok.
tsset id time
tsspell, cond(state==1)
Now I just have a slight complication.
My ID is actually composed by a couple of indicators, contained in two separate colums (i.e., ID for lender and ID for borrower).
On the contrary, the tsset command does not allow multiple variable for ID.
Question: how could I get a SINGLE index representing the SPECIFIC COUPLE of indicators.
Thanks in advance.
--- Mer 30/11/11, Nick Cox <njcoxstata@gmail.com> ha scritto:
> Da: Nick Cox <njcoxstata@gmail.com>
> Oggetto: Re: st: capturing the sizes of the sequences of countinous (uninterrupted) values equal to 1
> A: statalist@hsphsun2.harvard.edu
> Data: Mercoledì 30 novembre 2011, 10:52
> Sorry; previous post was sent too
> soon.
>
> Toy example using -tsspell- (SSC). What you want is I think
> created
> here as _seq, except that you need to subtract 1.
>
> clear
> set obs 10
> gen id = _n
> forval j = 1/5 {
> gen time`j' = runiform() <
> 0.7
> }
>
> reshape long time , i(id)
> rename time state
> rename _j time
> tsset id time
> tsspell, cond(state==1)
>
> . l
>
> +------------------------------------------+
> | id time state _seq _spell _end |
> |------------------------------------------|
> 1. | 1 1 1 1 1
> 0 |
> 2. | 1 2 1 2 1
> 0 |
> 3. | 1 3 1 3 1
> 1 |
> 4. | 1 4 0 0 0
> 0 |
> 5. | 1 5 0 0 0
> 0 |
> |------------------------------------------|
> 6. | 2 1 1 1 1
> 0 |
> 7. | 2 2 1 2 1
> 0 |
> 8. | 2 3 1 3 1
> 0 |
> 9. | 2 4 1 4 1
> 0 |
> 10. | 2 5 1 5 1
> 1 |
> |------------------------------------------|
> 11. | 3 1 1 1 1
> 0 |
> 12. | 3 2 1 2 1
> 0 |
> 13. | 3 3 1 3 1
> 0 |
> 14. | 3 4 1 4 1
> 0 |
> 15. | 3 5 1 5 1
> 1 |
> |------------------------------------------|
> 16. | 4 1 1 1 1
> 1 |
> 17. | 4 2 0 0 0
> 0 |
> 18. | 4 3 0 0 0
> 0 |
> 19. | 4 4 1 1 2
> 0 |
> 20. | 4 5 1 2 2
> 1 |
> |------------------------------------------|
> 21. | 5 1 1 1 1
> 0 |
> 22. | 5 2 1 2 1
> 1 |
> 23. | 5 3 0 0 0
> 0 |
> 24. | 5 4 1 1 2
> 1 |
> 25. | 5 5 0 0 0
> 0 |
> |------------------------------------------|
> 26. | 6 1 1 1 1
> 1 |
> 27. | 6 2 0 0 0
> 0 |
> 28. | 6 3 1 1 2
> 0 |
> 29. | 6 4 1 2 2
> 0 |
> 30. | 6 5 1 3 2
> 1 |
> |------------------------------------------|
> 31. | 7 1 1 1 1
> 0 |
> 32. | 7 2 1 2 1
> 0 |
> 33. | 7 3 1 3 1
> 1 |
> 34. | 7 4 0 0 0
> 0 |
> 35. | 7 5 1 1 2
> 1 |
> |------------------------------------------|
> 36. | 8 1 1 1 1
> 0 |
> 37. | 8 2 1 2 1
> 1 |
> 38. | 8 3 0 0 0
> 0 |
> 39. | 8 4 1 1 2
> 1 |
> 40. | 8 5 0 0 0
> 0 |
> |------------------------------------------|
> 41. | 9 1 1 1 1
> 0 |
> 42. | 9 2 1 2 1
> 0 |
> 43. | 9 3 1 3 1
> 0 |
> 44. | 9 4 1 4 1
> 0 |
> 45. | 9 5 1 5 1
> 1 |
> |------------------------------------------|
> 46. | 10 1 0 0 0
> 0 |
> 47. | 10 2 0 0 0
> 0 |
> 48. | 10 3 1 1 1
> 0 |
> 49. | 10 4 1 2 1
> 1 |
> 50. | 10 5 0 0 0
> 0 |
> +------------------------------------------+
>
>
> > On Wed, Nov 30, 2011 at 9:36 AM, Nick Cox <njcoxstata@gmail.com>
> wrote:
> >> You can't get this information given your data
> structure into a single
> >> Stata variable. What you seek is a matrix.
> >>
> >> If w <= 244, you could try concatenating your
> variables into a string
> >> variable holding individuals' history.
> >>
> >> But I guess this would be easier after -reshape
> long-. Then a spell is
> >> defined as a sequence with all 1s for the same id.
> See then
> >>
> >> SJ-7-2 dm0029 . . . . . . . . . . . . . .
> Speaking Stata: Identifying spells
> >> . . . . . . . . . . . . . . . . . . . .
> . . . . . . . . . . N. J. Cox
> >> Q2/07 SJ 7(2):249--265
> (no commands)
> >> shows how to handle spells with
> complete control over
> >> spell specification
> >>
> >> tsspell from http://fmwww.bc.edu/RePEc/bocode/t
> >> 'TSSPELL': module for identification of
> spells or runs in time series /
> >> tsspell examines the data, which must be
> tsset time series, to / identify
> >> spells or runs, which are contiguous
> sequences defined / by some
> >> condition. tsspell generates new variables
> indicating / distinct spells,
> >>
> >> Nick
> >>
> >> On Wed, Nov 30, 2011 at 9:24 AM, massimiliano
> stacchini
> >> <mastacchini@yahoo.it>
> wrote:
> >>
> >>> I have a huge dataset. The rows identify the
> person ID (i) (i=1,...,n) while in columns there are the
> reference dates TIME(t) (t=1,...,w). Each cells contain the
> value 1 or 0 (zero), alternatively.
> >>>
> >>> I should create a variable (LENGTH) varying
> both over ID and TIME.
> >>> For each i of ID(i) in t of TIME(t), LENGTH
> should captures the number of continuous (uninterrupted)
> values which are equal to 1 in the interval of cells
> starting from the reference data t of TIME and moving
> backwards to the previous reference dates.
> >>> In other terms , LENGTH should capture for
> each (i) of ID and for each (t) of TIME the number of s in T
> (t-s) identifying cells having values equal to 1 (i.e., the
> size of the sequence of uninterrupted 1 moving backwards to
> the previous reference dates).
> >>>
>
> *
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