ex10.42 {Devore6} | R Documentation

## data from exercise 10.42

### Description

The `ex10.42` data frame has 19 rows and 2 columns of critical flicker frequencies according to eye color.

### Usage

    data(ex10.42)

### Format

This data frame contains the following columns:

cff
  a numeric vector of critical flicker frequencies
color
  eye color - a factor with levels `Blue`, `Brown`, and `Green`

### Source

Devore, J. L. (2003) Probability and Statistics for Engineering and the Sciences (6th ed), Duxbury

### Examples

    data(ex10.42)
    str(ex10.42)
    boxplot(cff ~ color, ex10.42, horizontal = TRUE, las = 1,
      xlab = "Critical Flicker Frequency (Hz)")
    fm1 <- aov(cff ~ color, data = ex10.42)
    summary(fm1)

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