Hi,
Cleber Nogueira Borges wrote:
hanen wrote:
hi,
my linear model is y=c+a*x1+b*x2 i tried to found a, c, b by the use of:
mymodel<-lm(y~1+x1+x2) where y, x1, x2 are 3 vectors with the same length
the result is a=NA.so i want to know where is the problem.
It's the sum of x1 and x2 equal to one?
run the command: round( sum( c(x1,x2) ),12)==1
may I ask how this may solve the problem?
You concatenate the two vectors x1, x2; calculate the sum of it; round
it to 12 digits; and then check whether it is equal to 1.
Roland
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