These are data from the 2009 NHIS survey. People who have read Mastering 'Metrics should recognize these data. They're featured prominently in that book and the authors' discussion of random assignment and experiments.

mm_nhis

## Format

A data frame with 18790 observations on the following 10 variables.

fml

is the respondent a woman?

hi

a numeric vector for whether respondent has at least some health insurance

hlth

a numeric vector for a health index, broadly understood

nwhite

is the respondent not white?

age

the respondent's age in years

yedu

the respondent's total years of education

famsize

the size of the respondent's family

empl

is the respondent employed

inc

the respondent's household/family income

perweight

a numeric vector for weight

## Source

National Health Interview Survey (2009).

## Details

Data are already cleaned in a way that facilitates an easy replication of Table 1.1 in Mastering 'Metrics. Check http://www.masteringmetrics.com for more information.