# smoke: smoke In wooldridge: 115 Data Sets from "Introductory Econometrics: A Modern Approach, 7e" by Jeffrey M. Wooldridge

## Description

Wooldridge Source: J. Mullahy (1997), “Instrumental-Variable Estimation of Count Data Models: Applications to Models of Cigarette Smoking Behavior,” Review of Economics and Statistics 79, 596-593. Professor Mullahy kindly provided the data. Data loads lazily.

## Usage

 `1` ```data('smoke') ```

## Format

A data.frame with 807 observations on 10 variables:

• educ: years of schooling

• cigpric: state cig. price, cents/pack

• white: =1 if white

• age: in years

• income: annual income, \$

• cigs: cigs. smoked per day

• restaurn: =1 if rest. smk. restrictions

• lincome: log(income)

• agesq: age^2

• lcigpric: log(cigprice)

## Notes

If you want to do a “fancy” IV version of Computer Exercise C16.1, you could estimate a reduced form count model for cigs using the Poisson regression methods in Section 17.3, and then use the fitted values as an IV for cigs. Presumably, this would be for a fairly advanced class.

Used in Text: pages 183, 288-289, 298, 301, 578, 627

## Examples

 `1` ``` str(smoke) ```

### Example output

```'data.frame':	807 obs. of  10 variables:
\$ educ    : num  16 16 12 13.5 10 6 12 15 12 12 ...
\$ cigpric : num  60.5 57.9 57.7 57.9 58.3 ...
\$ white   : int  1 1 1 1 1 1 1 1 1 1 ...
\$ age     : int  46 40 58 30 17 86 35 48 48 31 ...
\$ income  : int  20000 30000 30000 20000 20000 6500 20000 30000 20000 20000 ...
\$ cigs    : int  0 0 3 0 0 0 0 0 0 0 ...
\$ restaurn: int  0 0 0 0 0 0 0 0 0 0 ...
\$ lincome : num  9.9 10.3 10.3 9.9 9.9 ...
\$ agesq   : int  2116 1600 3364 900 289 7396 1225 2304 2304 961 ...
\$ lcigpric: num  4.1 4.06 4.05 4.06 4.07 ...
- attr(*, "datalabel")= chr ""
- attr(*, "time.stamp")= chr "25 Jun 2011 23:03"
- attr(*, "formats")= chr  "%9.0g" "%9.0g" "%8.0g" "%8.0g" ...
- attr(*, "types")= int  254 254 251 251 252 251 251 254 252 254
- attr(*, "val.labels")= chr  "" "" "" "" ...
- attr(*, "var.labels")= chr  "years of schooling" "state cig. price, cents/pack" "=1 if white" "in years" ...
- attr(*, "version")= int 10
```

wooldridge documentation built on Nov. 8, 2021, 9:07 a.m.