| Semiconductor {SASmixed} | R Documentation |
The Semiconductor data frame has 48 rows and 5 columns.
This data frame contains the following columns:
1 to 4 representing etch time.
1 to 3
1 to 4
1/1 < 1/2 < 1/3 < 2/1 < 2/2 < 2/3 < 3/1 < 3/2 < 3/3 < 4/1 < 4/2 < 4/3
Littel, R. C., Milliken, G. A., Stroup, W. W., and Wolfinger, R. D. (1996), SAS System for Mixed Models, SAS Institute (Data Set 2.2(b)).
str(Semiconductor)
if (require("lme4", quietly = TRUE, character = TRUE)) {
options(contrasts = c(unordered = "contr.SAS", ordered = "contr.poly"))
print(fm1Semi <- lmer(resistance ~ ET * position + (1|Grp), Semiconductor))
print(anova(fm1Semi))
print((fm2Semi <- lmer(resistance ~ ET + position + (1|Grp), Semiconductor)))
print(anova(fm2Semi))
}