xmp11.12 {Devore6} | R Documentation

## data from Example 11.12

### Description

The `xmp11.12` data frame has 36 rows and 4 columns.

### Format

This data frame contains the following columns:

abrasion
  a numeric vector
row
  a numeric vector
column
  a numeric vector
humidity
  a numeric vector

### Details

### Source

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

(1946), ``The abrasion of leather'', J. Inter. Soc. Leather Trades' Chemists, 287.

### Examples

    data(xmp11.12)
    xmp11.12$row <- ordered(xmp11.12$row)
    xmp11.12$column <- ordered(xmp11.12$column)
    xmp11.12$humidity <- ordered(xmp11.12$humidity)
    attach(xmp11.12)  # to check the design
    table(row, column)
    table(row, humidity)
    table(humidity, column)
    detach()
    fm1 <- lm(abrasion ~ row + column + humidity, xmp11.12)
    anova(fm1)    # compare with Table 11.9, page 464

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