Exercise

Syntax from math

The babies data set contains observations about the birthweight and other characteristics of children born in the San Francisco Bay area from 1960--1967.

We would like to build a model for birthweight as a function of the mother's age and whether this child was her first (parity == 0). Use the mathematical specification below to code the model in R.

$$ birthweight = \beta_0 + \beta_1 \cdot age + \beta_2 \cdot parity + \epsilon $$

Instructions

100 XP

The birthweight variable is recorded in the column bwt.

Use lm() to build the parallel slopes model specified above. It's not necessary to use factor() in this case as the variable parity is coded using binary numeric values.