Help using Base SAS procedures

Proc Lifetest Quartiles

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Proc Lifetest Quartiles

Hi everybody,

I'im doing a simple proc lifetest with a productLimit estimates. Everything is going well, but seeaing the results :

Quartile Estimates

Point 95% Confidence Interval

Percent Estimate Transform [Lower Upper)

75 .            LOGLOG 68.0984 .

50 36.5246 LOGLOG 34.7213 38.9508

25 15.8689 LOGLOG 14.3934 17.5738

You see that for the 75% percentile, SAS don't do an estimation (ok no problem) but why do it estimate the lower confidence interval ????

Thank you for helping me

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