How can I recode the variable in this long format data set with Stata?

[smith Jason]

I want to create a new variable "signal" in this long format data set. The rule is set below,
if all status values equal 1 within id, then signal==number of the consecutive status value (which is one)+1
if all status values equal 0 within id, then signal==1
if the first 0 occurs several consecutive 1 within id, then signal==number of the consecutive status value (which is one)+1
For example, for id==1, signal=3+1=4
*Simulated data for illustrative purpose.
clear
input byte (id status)
1 1
1 1
1 1
1 0
1 0
1 0
1 0
1 0
1 0
2 0
2 0
2 0
2 0
2 0
3 1
3 1
3 1
3 1
3 1
3 1
3 1
4 1
4 0
4 0
4 0
end

Thank you for your help!

[Andrew Musau]

Your conditions seem to imply that signal is equal to one if no status from start to end, otherwise one plus the longest status spell. Presumably, you should have a time variable in the dataset.

* Example generated by -dataex-. For more info, type help dataex
clear
input byte(id status)
1 1
1 1
1 1
1 0
1 0
1 0
1 0
1 0
1 0
2 0
2 0
2 0
2 0
2 0
3 1
3 1
3 1
3 1
3 1
3 1
3 1
4 1
4 0
4 0
4 0
5 0
5 1
5 1
5 0
5 1
5 1
5 1
end

gen time=_n
bys id (time): replace time=_n
xtset id time
bys id: gen spell= sum(status & l.status!=1)
replace spell=0 if !status
bys id spell: gen count=-_N if spell
bys id (count): gen signal= cond(missing(count[1])&missing(count[_N])&!status[1]&!status[_N],1,abs(count[1])+1)
drop spell count

Res.:

. sort id time

. l, sepby(id)

     +-----------------------------+
     | id   status   time   signal |
     |-----------------------------|
  1. |  1        1      1        4 |
  2. |  1        1      2        4 |
  3. |  1        1      3        4 |
  4. |  1        0      4        4 |
  5. |  1        0      5        4 |
  6. |  1        0      6        4 |
  7. |  1        0      7        4 |
  8. |  1        0      8        4 |
  9. |  1        0      9        4 |
     |-----------------------------|
 10. |  2        0      1        1 |
 11. |  2        0      2        1 |
 12. |  2        0      3        1 |
 13. |  2        0      4        1 |
 14. |  2        0      5        1 |
     |-----------------------------|
 15. |  3        1      1        8 |
 16. |  3        1      2        8 |
 17. |  3        1      3        8 |
 18. |  3        1      4        8 |
 19. |  3        1      5        8 |
 20. |  3        1      6        8 |
 21. |  3        1      7        8 |
     |-----------------------------|
 22. |  4        1      1        2 |
 23. |  4        0      2        2 |
 24. |  4        0      3        2 |
 25. |  4        0      4        2 |
     |-----------------------------|
 26. |  5        0      1        4 |
 27. |  5        1      2        4 |
 28. |  5        1      3        4 |
 29. |  5        0      4        4 |
 30. |  5        1      5        4 |
 31. |  5        1      6        4 |
 32. |  5        1      7        4 |
     +-----------------------------+

.

[smith Jason]

Thank you for your response!
I think that two lines will work for this data set.
egen signal=total (status==1), by (id)
replace signal=signal+1

[smith Jason]

s

Your conditions seem to imply that signal is equal to one if no status from start to end, otherwise one plus the longest status spell. Presumably, you should have a time variable in the dataset.

* Example generated by -dataex-. For more info, type help dataex
clear
input byte(id status)
1 1
1 1
1 1
1 0
1 0
1 0
1 0
1 0
1 0
2 0
2 0
2 0
2 0
2 0
3 1
3 1
3 1
3 1
3 1
3 1
3 1
4 1
4 0
4 0
4 0
5 0
5 1
5 1
5 0
5 1
5 1
5 1
end

gen time=_n
bys id (time): replace time=_n
xtset id time
bys id: gen spell= sum(status & l.status!=1)
replace spell=0 if !status
bys id spell: gen count=-_N if spell
bys id (count): gen signal= cond(missing(count[1])&missing(count[_N])&!status[1]&!status[_N],1,abs(count[1])+1)
drop spell count

Res.:

. sort id time

. l, sepby(id)

+-----------------------------+
| id status time signal |
|-----------------------------|
1. | 1 1 1 4 |
2. | 1 1 2 4 |
3. | 1 1 3 4 |
4. | 1 0 4 4 |
5. | 1 0 5 4 |
6. | 1 0 6 4 |
7. | 1 0 7 4 |
8. | 1 0 8 4 |
9. | 1 0 9 4 |
|-----------------------------|
10. | 2 0 1 1 |
11. | 2 0 2 1 |
12. | 2 0 3 1 |
13. | 2 0 4 1 |
14. | 2 0 5 1 |
|-----------------------------|
15. | 3 1 1 8 |
16. | 3 1 2 8 |
17. | 3 1 3 8 |
18. | 3 1 4 8 |
19. | 3 1 5 8 |
20. | 3 1 6 8 |
21. | 3 1 7 8 |
|-----------------------------|
22. | 4 1 1 2 |
23. | 4 0 2 2 |
24. | 4 0 3 2 |
25. | 4 0 4 2 |
|-----------------------------|
26. | 5 0 1 4 |
27. | 5 1 2 4 |
28. | 5 1 3 4 |
29. | 5 0 4 4 |
30. | 5 1 5 4 |
31. | 5 1 6 4 |
32. | 5 1 7 4 |
+-----------------------------+

.

There is no id==5 in the original data set. I know you would like to add this data record for illustration. However, it is incorrect because it is not allowed to have a zero between consecutive 1s. Anyway, thank you for your kindly help!