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ANOVA Case Study
Automobile Brake Tests
Data Format: Replicated Two-Factor ANOVA
Table 1 shows the format of a data set with two factors and a balanced (equal) number of observations per treatment (each row-column intersection is a treatment). To avoid needless subscripts, the observations in each treatment are represented simply as xxx. Except for the replication within cells, the format is the same as the unreplicated two-factor ANOVA.
Table 1. Data Format of Replicated Two-Factor ANOVA
Levels of Factor B
B1 B2 ... Bc Row Sum Row Mean
Levels of Factor A A1 xxx
xxx
...
xxx xxx
xxx
...
xxx ...
...
...
... xxx
xxx
...
xxx R1
A2 xxx
xxx
...
xxx xxx
xxx
...
xxx ...
...
...
... xxx
xxx
...
xxx R2
... ... ... ... ... ... ...
Ar xxx
xxx
...
xxx xxx
xxx
...
xxx ...
...
...
... xxx
xxx
...
xxx Rr
...