xmp13.13 {Devore6} | R Documentation

## data from Example 13.13

### Description

The `xmp13.13` data frame has 9 rows and 5 columns of data on characteristics of concrete.

### Format

This data frame contains the following columns:

x1
  the % limestone powder.
x2
  the water-cement ratio.
x1x2
  the interaction of limestone powder and water-cement ratio.
strength
  the 28-day compressive strength (MPa).
absorbability
  the absorbability (%).

### Source

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

### Examples

    data(xmp13.13)
    fm1 <- lm(strength ~ x1 * x2, data = xmp13.13)
    summary(fm1)

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