[R] lm() function

[Roland Rau]

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