# engel

From quantreg v5.54
by Roger Koenker

##### Engel Data

Engel food expenditure data used in Koenker and Bassett(1982). This is a regression data set consisting of 235 observations on income and expenditure on food for Belgian working class households.

- Keywords
- datasets

##### Usage

`data(engel)`

##### Format

A data frame containing 235 observations on 2 variables

- income
annual household income in Belgian francs

- foodexp
annual household food expenditure in Belgian francs

##### References

Koenker, R. and Bassett, G (1982)
Robust Tests of Heteroscedasticity based on Regression Quantiles;
*Econometrica* **50**, 43--61.

##### Examples

```
# NOT RUN {
## See also demo("engel1")
## --------------
data(engel)
plot(engel, log = "xy",
main = "'engel' data (log - log scale)")
plot(log10(foodexp) ~ log10(income), data = engel,
main = "'engel' data (log10 - transformed)")
taus <- c(.15, .25, .50, .75, .95, .99)
rqs <- as.list(taus)
for(i in seq(along = taus)) {
rqs[[i]] <- rq(log10(foodexp) ~ log10(income), tau = taus[i], data = engel)
lines(log10(engel$income), fitted(rqs[[i]]), col = i+1)
}
legend("bottomright", paste("tau = ", taus), inset = .04,
col = 2:(length(taus)+1), lty=1)
# }
```

*Documentation reproduced from package quantreg, version 5.54, License: GPL (>= 2)*

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