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Kaplan-Meier Confidence interval.

Iancar29 · 2016-05-18 10:27:08

Hi guys just wondering if anyone could lend some help on the formula for the 95% confidence interval. i have it as S(t) +/- Z(α/2) * SE So for 95% does the Z value become 1.96 i.e S(t) +/- 1.96 * SE ? Just that my answers aren't matching r output even though my S(t) & SE is correct. Thanks in advance.

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18-05-2016 11:27am

#1

Iancar29

Registered Users Posts: 5,068 ✭✭✭

Join Date: January 2009

Posts: 4818

Hi guys just wondering if anyone could lend some help on the formula for the 95% confidence interval.

i have it as S(t) +/- Z(α/2) * SE

So for 95% does the Z value become 1.96
i.e S(t) +/- 1.96 * SE ?

Just that my answers aren't matching r output even though my S(t) & SE is correct.

Thanks in advance.

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#2 27-05-2016 7:45am
Yakuza

Registered Users Posts: 5,141 ✭✭✭

Join Date: November 1999

Posts: 5008

Did you take the square root of the variance?

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