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intercept
2007 Oct 29
1
How to test combined effects?
Suppose I have a mixed-effects model where yij is the jth sample for
the ith subject:
yij= beta0 + beta1(age) + beta2(age^2) + beta3(age^3) + beta4(IQ) +
beta5(IQ^2) + beta6(age*IQ) + beta7(age^2*IQ) + beta8(age^3 *IQ)
+random intercepti + eij
In R how can I get an F test against the null hypothesis of
beta6=beta7=beta8=0? In SAS I can run something like contrast age*IQ
1, age^2*IQ 1, age^3 *IQ 1, but is there anything similar in R?
Thanks in advance,
Gang
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2003 Feb 19
14
Echo
I used to get bad echo and also voice breaking up during a conversation, so
I upgraded the machine (from a PII 300 to a Athlon 1.8GHz) and have resolved
the voice breaking up issues but still seem to have a fairly bad echo on
*both* sides of the conversation.
Currently I am only using the system for outbound calls, so I am always
calling from the digium USB port phone and out to the telco using a