Paul Swank <[EMAIL PROTECTED]> wrote:
An interaction is always a test of parallel
lines whether it is factoral anova, ancova, regression, or profile analysis.
Not really. interaction was invented by RA Fisher for ANOVA where there
are no lines. that's like saying that ANOVA is regression. It i
On Mon, 23 Apr 2001, jim clark wrote:
> On 22 Apr 2001, Donald Burrill wrote:
> > If I were doing it, I'd begin with a "full model" (or "augmented model",
> > in Judd & McClelland's terms) containing three predictors:
> > y = b0 + b1*X + b2*A + b3*(AX) + error
> > where A had been recoded
Hi
On 22 Apr 2001, Donald Burrill wrote:
> If I were doing it, I'd begin with a "full model" (or "augmented model",
> in Judd & McClelland's terms) containing three predictors:
> y = b0 + b1*X + b2*A + b3*(AX) + error
> where A had been recoded to (0,1) and (AX) = A*X.[1]
A number
The clearest (and withal concise) exposition of ANCOVA that I ever
encountered is at the beginning of the third chapter of Tatsuoka's book
on multivariate analysis. If you can find a copy, it would both explain
what ANCOVA is all about, and illuminate the more cryptic responses
you've already
William B. Ware <[EMAIL PROTECTED]> wrote:
: sequential/hierarchical regression as you note below... however, ANCOVA
: has at least two assumptions that your situation does not meet. First, it
: assumes that assignment to treatment condition is random. Second, it
: assumes that the measurement o
On Fri, 20 Apr 2001 13:11:02 -0400, "William Levine"
<[EMAIL PROTECTED]> wrote:
...
> A study was conducted to assess whether there were age differences in memory
> for order independent of memory for items. Two preexisting groups (younger
> and older adults - let's call this variable A) were tes
On Fri, 20 Apr 2001, William Levine wrote:
> A study was conducted to assess whether there were age differences in memory
> for order independent of memory for items. Two preexisting groups (younger
> and older adults - let's call this variable A) were tested for memory for
> order information (Y
