hw11sol - STA 6934 (5) HW#11 Variable Cocaine/Crack Use...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
STA 6934 HW#11 (5) Variable Coefficient Cocaine/Crack Use (x1) 1.354 Marital Status(x2) 0.779 Number of Prenatal visits(x3) -0.098 Alcohol use(x4) 0.723 Level of Education(x5) 0.298 ln{ p/ 1 – p} = + 1.354x1 + 0.779x2 – 0.098x3 + 0.7234x4 + 0.298 x5 a) As x3 increases, p decreases. Therefore, as an expectant mother’s number of prenatal visits to the doctor increases, the probability that her child will be born with congenital syphilis decreases. b) For marital status, ‘0 represents married and ‘1 represents unmarried! OR = e 0.779 = 2.179. So odds of syphilis are 2.2 times higher for unmarried mothers. c) For cocaine consumption: ‘1’ represents usage of drugs and ‘0’ represents non-usage of drugs. OR = e 1.354 = 3.872. So odds of syphilis are almost 4 times higher for a drug user. d) Confidence Intervals: Se(B) = 0.162 (1.354-1.96(Se (B)), 1.354 + 1.96(Se (B)) ( 1.03, 1.67) Now, a 95% CI for OR term will have (e 1.03 , e 1.67 ) = (2.8, 5.31) This implies there is a significant relationship as CI excludes 1. Hence, for cocaine users, the odds of congenital syphilis are higher than for non-cocaine users. (7) a)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/15/2012 for the course STA 6934 taught by Professor Young during the Fall '08 term at University of Florida.

Page1 / 2

hw11sol - STA 6934 (5) HW#11 Variable Cocaine/Crack Use...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online