Logistisk regression
Logistisk regression
Logistisk regression
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
u n i v e r s i t y o f c o p e n h a g e n<br />
d e p a r t m e n t o f b i o s t a t i s t i c s<br />
Beskrivelse af alderseffekten<br />
Alderseffekten kan undersøges ved at se på odds-ratio’erne:<br />
OR 1 (X = 2 vs. X = 1) =<br />
61·308<br />
298·51<br />
= 1.24<br />
= exp(0.21)<br />
OR 2 (X = 3 vs. X = 1) =<br />
64·308<br />
254·51<br />
1.52<br />
= exp(0.42)<br />
OR 3 (X = 4 vs. X = 1) =<br />
92·308<br />
235·51<br />
2.36<br />
= exp(0.86)<br />
Vi kan benytte et sædvanligt χ 2 -test til at undersøge om<br />
OR 1 = OR 2 = OR 3 = 1:<br />
Chi-i-anden test<br />
> ageGrp48)+I(age>52)+I(age>56))<br />
> chisq.test(ageGrp,chdI)<br />
Pearson’s Chi-squared test<br />
data: ageGrp and chdI<br />
X-squared = 23.2889, df = 3, p-value = 3.515e-05<br />
><br />
21 / 42
Change language