WaferTypes {SASmixed}R Documentation

Data on different types of silicon wafers

Description

The WaferTypes data frame has 144 rows and 8 columns.

Format

This data frame contains the following columns:

Group
a factor with levels 1 to 4
Temperature
an ordered factor with levels 900 < 1000 < 1100
Type
a factor with levels A and B
Wafer
a numeric vector
Site
a numeric vector
delta
a numeric vector
Thick
a numeric vector
uWafer
an ordered factor giving a unique code to each group, temperature, type and wafer combination.

Details

Source

Littel, R. C., Milliken, G. A., Stroup, W. W., and Wolfinger, R. D. (1996), SAS System for Mixed Models, SAS Institute (Data Set 5.8).

Examples

library(SASmixed)
options(
  contrasts = c(unordered = "contr.SAS", ordered = "contr.poly"))
data(WaferTypes)