1967 among women in the Kaiser Foundation Health Plan in the San Francisco East Bay area were reviewed. The collected information included: The weight of the infants in ounces (bwt) • The length of pregnancy in days (gestation), The mother's age in years (age), • The mother's height in inches (height), • The mother's pregnancy weight in pounds (weight), Whether the child was the first born (first_pregnancy), and Whether the mother was a smoker (smoke). The following tables are generated by Rguroo's linear regression analysis performed on part the data:

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Chapter1: Starting With Matlab
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In a study by the Child Health and Development Studies, all pregnancies between 1960 and
1967 among women in the Kaiser Foundation Health Plan in the San Francisco East Bay area
were reviewed. The collected information included:
.
.
.
.
●
The weight of the infants in ounces (bwt)
The length of pregnancy in days (gestation),
The mother's age in years (age),
The mother's height in inches (height),
The mother's pregnancy weight in pounds (weight),
Whether the child was the first born (first_pregnancy), and
Whether the mother was a smoker (smoke).
The following tables are generated by Rguroo's linear regression analysis performed on part of
the data:
Cases Used in the Analysis
Data Used
Number of cases read
Number of cases used in analysis
Number of incomplete cases
(omitted)
Term
(Intercept)
gestation
age
height
weight
smoke Yes
first_pregnancy Yes
Residual Standard
Error
Regression Coefficients Estimates
Coefficient Standard
Estimate
Error
-73.887
0.43676
-0.11761
0.93463
0.054383
8.1294
4.0893
No.
R-
Squared
980
941
Model Summary: Coefficient of Determination (R-
Squared)
DF
15.6 934
0.2493
39
t Value Pr> t
15.887 -4.6506 3.79E-06
0.033101 13.195 1.41E-36
0.096423 -1.2197
0.22289
0.22606 4.1345
3.88E-05
0.027592 1.971 0.049021
1.0534 7.717 3.05E-14
1.2613 3.2422 0.001228
Adjusted R-
Squared
0.24447
Transcribed Image Text:In a study by the Child Health and Development Studies, all pregnancies between 1960 and 1967 among women in the Kaiser Foundation Health Plan in the San Francisco East Bay area were reviewed. The collected information included: . . . . ● The weight of the infants in ounces (bwt) The length of pregnancy in days (gestation), The mother's age in years (age), The mother's height in inches (height), The mother's pregnancy weight in pounds (weight), Whether the child was the first born (first_pregnancy), and Whether the mother was a smoker (smoke). The following tables are generated by Rguroo's linear regression analysis performed on part of the data: Cases Used in the Analysis Data Used Number of cases read Number of cases used in analysis Number of incomplete cases (omitted) Term (Intercept) gestation age height weight smoke Yes first_pregnancy Yes Residual Standard Error Regression Coefficients Estimates Coefficient Standard Estimate Error -73.887 0.43676 -0.11761 0.93463 0.054383 8.1294 4.0893 No. R- Squared 980 941 Model Summary: Coefficient of Determination (R- Squared) DF 15.6 934 0.2493 39 t Value Pr> t 15.887 -4.6506 3.79E-06 0.033101 13.195 1.41E-36 0.096423 -1.2197 0.22289 0.22606 4.1345 3.88E-05 0.027592 1.971 0.049021 1.0534 7.717 3.05E-14 1.2613 3.2422 0.001228 Adjusted R- Squared 0.24447
15. Which predictor is the most significant variable? Why?
16. Which predictor is the least significant variable? Why?
17. Interpret the slope estimate for "first_pregnancy Yes"? (Be sure to include units.)
Transcribed Image Text:15. Which predictor is the most significant variable? Why? 16. Which predictor is the least significant variable? Why? 17. Interpret the slope estimate for "first_pregnancy Yes"? (Be sure to include units.)
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