a. How many observations does the sample contain?   b. What is the chi-square value for the likelihood ratio? What is being tested? Is the test significant? What does a significant result mean?    c. Write a sentence interpreting the relationship between preterm labor and low birth rate. Include a likelihood ratio and confidence interval of 95% in your interpretation.

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a. How many observations does the sample contain?

 

b. What is the chi-square value for the likelihood ratio? What is being tested? Is the test significant? What does a significant result mean? 

 

c. Write a sentence interpreting the relationship between preterm labor and low birth rate. Include a likelihood ratio and confidence interval of 95% in your interpretation. 

. logistic low ptl
Logistic regression
Log likelihood = -113.94631
low Odds ratio
ptl
_cons
Std. err.
2.229563 .7071136
.3812923 .0667112
Note: _cons estimates baseline odds.
Z
P> |z|
0.011
2.53
-5.51 0.000
Number of obs =
LR chi2(1)
Prob > chi2
Pseudo R2
189
6.78
1.197452
.2706021
= 0.0092
= 0.0289
[95% conf. interval]
4.151273
.5372605
Transcribed Image Text:. logistic low ptl Logistic regression Log likelihood = -113.94631 low Odds ratio ptl _cons Std. err. 2.229563 .7071136 .3812923 .0667112 Note: _cons estimates baseline odds. Z P> |z| 0.011 2.53 -5.51 0.000 Number of obs = LR chi2(1) Prob > chi2 Pseudo R2 189 6.78 1.197452 .2706021 = 0.0092 = 0.0289 [95% conf. interval] 4.151273 .5372605
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