Hi,
Can someone set me straight as to how to write formulas in R to indicate: complete independence [A][B][C]
Freq ~ A + B + C
joint independence [AB][C]
Freq ~ A * B + C
conditional independence [AC][BC]
Freq ~ A * C + B * C
nway interaction [AB][AC][BC]
Freq ~ A * B * C - A:B:C
You might have a look at demo(mosaic) in package vcd.
g., -d
?
For example, if I have 4 factors: hair colour, eye colour, age, sex
does > mosaicplot( frequency ~ hair + eye + age + sex)
mean that the model fitted is of complete independence of all factors [hair][eye][age][sex]?
So does > mosaicplot(frequency ~ hair + eye) mean that the model is of conditional independence [hairAgeSex][eyeAgeSex]?
How does the operator * as in > mosaicplot( frequency ~ hair * eye) or > mosaicplot( frequency ~ hair * eye + age) equate to in the type of independence model used?
Thanks in advance for any elucidation!
Gina
______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
