有关winbugs的提问

Question

请大神看看我这一段哪里错啦？一直在报expected the key word in，可是因为是新手所以一直不知道错哪了。model{

for(i in1:n){
cs[i] ~ dnorm(mu[i] , tau)
mu[i] <- beta0 + beta1*yd[i]
}
tau ~ dgamma(0.01,0.01)
beta0 ~ dnorm(0.0,1.0E-4)
beta1 ~ dnorm(0.0,1.0E-4)
s2 <-1/tau
s <- sqrt(s2)
for( i in1:n){
c.cs[i]<-cs[i] - mean(cs[])}
sy2 <- inprod(c.cs[] , c.cs[])/(n-1)
R2B <-1 - s2/sy2
typical.y <- beta0 + beta1*mean(yd[])
}

INITS
list( tau=1 ,beta0 = 1, beta1 =0 ,beta2 = 0)
DATA(list)
list(n=7,
cs = c(44853.9 , 41369.7 , 37913 , 34648 , 31978 , 30184 , 27487),
yd = c(59033.0 , 54353.2 , 50185 , 46382 , 42697 , 38817 ,35484))
END