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bsl
2011 Feb 07
0
Combining the results from two simple linear regression models
...ns so that I can come up
with a single equation for the total weight regressed on year. In reality,
there is missing data, so I can't just sum the data across datasets and come
up with a regression on the summed data. Below is a program to reproduce
what I am trying to figure out.
###
aslp=50
bslp=-50
sda=20
sdb=100
yrs=0:10
a= rnorm(11,100,sda)+aslp*yrs
b= rnorm (11,1000,sdb)+bslp*yrs
ma=lm(a~yrs)
mb=lm(b~yrs)
pra=predict(ma,data.frame(yrs=yrs),interval='confidence')
prb=predict(mb,data.frame(yrs=yrs),interval='confidence')
##combine the two regressions for a single equatio...