birthwt: Risk factors associated with low infant birth weight
In fic: Focused Information Criteria for Model Comparison

Description Usage Format Source References

Risk factors associated with low infant birth weight

birthwt

A data frame with 189 rows and 19 variables. The first 10 columns are included in the dataset of the same name in the MASS package. The remaining 9 columns are defined in Claeskens and Hjort (2008), and are included in this dataset for convenience.

low: indicator of birth weight less than 2.5 kg
age: mother's age in years
lwt: mother's weight in pounds at last menstrual period
race: mother's race (‘1’ = white, ‘2’ = black, ‘3’ = other)
smoke: smoking status during pregnancy
ptl: number of previous premature labours
ht: history of hypertension
ui: presence of uterine irritability
ftv: number of physician visits during the first trimester
bwt: birth weight in grams
smokeui: Binary indicator for both smoking and uterine irritation
smokeage: Interaction between age and binary (0/1) smoking status, that is, age for smokers and zero for non-smokers.
intercpt: Intercept term (all 1)
raceother: Binary indicator for race "other"
raceblack: Binary indicator for race "black"
ftv2p: Binary indicator for ftv, number of physician visits during the first trimester, 2 or more
ftv1: Binary indicator for ftv 1
ptd: Binary indicator for ptl, number of previous premature labours, 1 or more
lwtkg: Weight measured in kg, as used in Claeskens and Hjort. Note lwt, as used in MASS, is in pounds.

MASS package (Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer); originally from Hosmer, D.W. and Lemeshow, S. (1989) Applied Logistic Regression. New York: Wiley

Claeskens, G., & Hjort, N. L. (2008). Model selection and model averaging (Vol. 330). Cambridge: Cambridge University Press.

fic documentation built on May 1, 2019, 7:55 p.m.