foodstamp {robustbase} | R Documentation

## Food Stamp Program Participation

### Description

This data consists of 150 randomly selected persons from a survey with information on over 2000 elderly US citizens, where the response, indicates participation in the U.S. Food Stamp Program.

### Usage

    data(foodstamp)

### Format

A data frame with 150 observations on the following 4 variables.

`participation`

  participation in U.S. Food Stamp Program; yes = 1, no = 0

`tenancy`

  tenancy, indicating home ownership; yes = 1, no = 0

`suppl.income`

  supplemental income, indicating whether some form of supplemental security income is received; yes = 1, no = 0

`income`

  monthly income (in US dollars)

### Source

Data description and first analysis: Stefanski et al.(1986) who indicate Rizek(1978) as original source of the larger study.

Electronic version from CRAN package catdata.

### References

Rizek, R. L. (1978) The 1977-78 Nationwide Food Consumption Survey. Family Econ. Rev., Fall, 3–7.

Stefanski, L. A., Carroll, R. J. and Ruppert, D. (1986) Optimally bounded score functions for generalized linear models with applications to logistic regression. Biometrika 73, 413–424.

Künsch, H. R., Stefanski, L. A., Carroll, R. J. (1989) Conditionally unbiased bounded-influence estimation in general regression models, with applications to generalized linear models. J. American Statistical Association 84, 460–466.

### Examples

    data(foodstamp)

    (T123 <- xtabs(~ participation+ tenancy+ suppl.income, data=foodstamp))
    summary(T123) ## ==> the binary var's are clearly not independent

    foodSt <- within(foodstamp, {
       logInc <- log(1 + income)
       rm(income)
    })

    m1 <- glm(participation ~ ., family=binomial, data=foodSt)
    summary(m1)
    rm1 <- glmrob(participation ~ ., family=binomial, data=foodSt)
    summary(rm1)
    ## Now use robust weights.on.x :
    rm2 <- glmrob(participation ~ ., family=binomial, data=foodSt,
                  weights.on.x = "robCov")
    summary(rm2)## aha, now the weights are different:
    which( weights(rm2, type="robust") < 0.5)

[Package robustbase version 0.92-7 Index]