Hi, everyone,
Night. I have three questions about multiple linear regression in R.
Q1:
y=rnorm(10,mean=5)
x1=rnorm(10,mean=2)
x2=rnorm(10)
lin=lm(y~x1+x2)
summary(lin)
## In the summary, 'Residual standard error: 1.017 on 7 degrees of freedom',
1.017 is the estimate of the constance variance?
Q2:
beta0=lin$coefficients[1]
beta1=lin$coefficients[2]
beta2=lin$coefficients[3]
y_hat=beta0+beta1*x1+beta2*x2
## Is there any built-in function in R to obtain y_hat directly?
Q3:
If I want to apply this regression result to another dataset, that is, new
x1 and x2. Is the built-in function in 2 still available?
Thank you in advance!
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