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)) }