Hi STATA users,
I have a set of survival data as below which is from a longitudinal study. And I know that 6 out of 50 are not failures in the last visit.
I am wondering why the survival function at 26.5 is missing.
Also, at about 26 months, the curve drops to zero. Which might look like the accumulated success rate is 0. I can understand that is because some of the participants are censored since the survival time is less than 26 months which is the last subject that has a failure.
I am considering how to deal with this situation for a longitudinal study.
Thank you.
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I have a set of survival data as below which is from a longitudinal study. And I know that 6 out of 50 are not failures in the last visit.
I am wondering why the survival function at 26.5 is missing.
Also, at about 26 months, the curve drops to zero. Which might look like the accumulated success rate is 0. I can understand that is because some of the participants are censored since the survival time is less than 26 months which is the last subject that has a failure.
I am considering how to deal with this situation for a longitudinal study.
Thank you.
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Code:
* Example generated by -dataex-. To install: ssc install dataex clear input double maindemographicid byte(_st _d _t0) double _t 38 1 1 0 .46052631578947373 74 1 1 0 .8223684210526316 111 1 1 0 .8223684210526316 149 1 1 0 .8552631578947368 84 1 1 0 .8881578947368421 87 1 1 0 .8881578947368421 48 1 1 0 .9210526315789475 119 1 1 0 .9210526315789475 89 1 1 0 .9210526315789475 125 1 1 0 .9210526315789475 82 1 1 0 .9210526315789475 72 1 1 0 .9210526315789475 113 1 1 0 .9210526315789475 56 1 1 0 .9539473684210527 114 1 1 0 .9539473684210527 46 1 1 0 1.0197368421052633 158 1 1 0 1.0197368421052633 147 1 1 0 1.0855263157894737 76 1 1 0 1.1513157894736843 63 1 1 0 1.1513157894736843 29 1 1 0 1.1513157894736843 102 1 1 0 1.1842105263157896 122 1 1 0 2.2039473684210527 150 1 1 0 2.6644736842105266 106 1 1 0 2.763157894736842 26 1 1 0 2.7960526315789473 109 1 1 0 2.8947368421052633 12 1 1 0 2.9276315789473686 59 1 1 0 2.993421052631579 108 1 1 0 2.993421052631579 132 1 1 0 3.0263157894736845 126 1 1 0 3.223684210526316 50 1 1 0 3.4539473684210527 70 1 1 0 3.7171052631578947 94 1 1 0 5.7894736842105266 67 1 1 0 5.855263157894737 52 1 1 0 6.25 155 1 1 0 11.447368421052632 137 1 1 0 11.743421052631579 136 1 1 0 11.875 156 1 1 0 13.55263157894737 123 1 1 0 18.585526315789476 69 1 0 0 22.697368421052634 104 1 0 0 23.75 16 1 1 0 23.88157894736842 77 1 0 0 24.17763157894737 45 1 0 0 24.342105263157897 61 1 0 0 24.572368421052634 99 1 0 0 24.80263157894737 140 1 1 0 26.48026315789474 end sts list, at(1 3 6 12 18 24 26.5 )
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