Displaying 4 results from an estimated 4 matches for "interction".
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interaction
2005 Feb 17
1
How to get interction terms first in a model
Consider the following two specifications of a model:
library( splines )
x <- 1:100
y <- rnorm( 100 )
w <- rep( 1, 100 )
A <- factor( sample( 1:2, 100, replace=T ) )
B <- factor( sample( letters[1:4], 100, replace=T ) )
summary( lm( y ~ ns( x, knots=c(30, 50, 70 ), intercept=T ):A - 1 + B )
)
summary( lm( y ~ ns( x, knots=c(30, 50, 70 ), intercept=T ):A - 1 + B:w
) )
The
2002 Mar 11
1
2.2.3a PDC Win2K Citrix Profiles
This weekend I upgraded SAMBA from 2.2.2 to 2.2.3a then made it the PDC on
our LAN. Original PDC was an NT4 Server. There is a Win2K Server running
Citrix Metaframe-XP, and the old NT4 PDC Server was replaced with another
Win2K
Server to be the Database Server. I didn't want to bother with setting Win2K
up as a DNS and DFS/ADS Server (required for being a PDC), so selected to
make SAMBA the
2003 Jul 27
2
continuous independent variable in lme
...ta)
anova(mod1)
I get:
numDF denDF F-value p-value
(Intercept) 1 336 41817.83 <.0001
line 3 8 14.38 0.0014
temp 1 8 338.21 <.0001
line:temp 3 8 0.62 0.6211
I have a significant effect of selection line. Eyeballing the
interction.plot, it is clear the the line called "25" is smaller at both
temperatures than the other lines.
but when I check the contrasts with summary(mod1) I get:
Fixed effects: area ~ line * temp
Value Std.Error DF t-value p-value
(Intercept) 165417.32 3102.751 336 53.3131...
2002 Aug 08
1
Lisp-stat and R? [was: Re: Status?]
John Fox (see below) raises important questions for
the Lisp-stat community (and perhaps the R community) to consider.
This message thread was not cross-posted to r-devel@lists.r-project.org,
so I do so now.
I have never been an active or particularly adept Lisp-stat programmer. But I
have worked on or used several projects for which Lisp-stat seemed the ideal
environment-- for implementing