Hi! as my subject says I am struggling with the different of a two-way ANOVA and a (two-way) ANCOVA.
I found the following examples from this webpage: http://www.statmethods.net/stats/anova.html # One Way Anova (Completely Randomized Design) fit <- aov(y ~ A, data=mydataframe) # Randomized Block Design (B is the blocking factor) fit <- aov(y ~ A + B, data=mydataframe) # Two Way Factorial Design fit <- aov(y ~ A + B + A:B, data=mydataframe) fit <- aov(y ~ A*B, data=mydataframe) # same thing # Analysis of Covariance fit <- aov(y ~ A + x, data=mydataframe) I) The 1. example is pretty clear. A simple on way ANOVA. II) Is it correct to say that example 2. (which is called a Randomized Block Design) is a two way ANOVA? III) Example 3 is like example 2. (in case I was right in II) ) a two way ANOVA but including an interaction term. That's why they call it here a Factorial Design. So far so good. IV) For me, the ANCOVA (last example) looks like a two-way ANOVA. So in what way is the variable "x" different to variable "B" so that it is called an ANCOVA and not an ANOVA??? I presume that from the type of data R knows whether to perform an ANCOVA or an ANOVA. V) Is it right to say that the ANCOVA example is a two-way ANCOVA? Or can a one-way ANCOVA actually exists? You see I am a bit confused especially how R distinguishes between the ANCOVA and the two-way ANOVA? I hope to find some useful answers here. Cheers! -- View this message in context: http://r.789695.n4.nabble.com/Difference-between-two-way-ANOVA-and-two-way-ANCOVA-tp4635403.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
