winbugs模型设定问题

初接触bugs，遇到麻烦希望大家帮忙解决。
weight和g[],wd[],tq[]都是设定的数据，需要估出theta[j], bg[i,1], bwd[i,1], btq[i,1]
我是想设bg[i,1]服从正态，bg[i,2]不需要估计，设定其为= 0
但compiling时，提示multiple definitions of node bg[1,1]，水平太差，请达人指教！

model{
  for (j in 1:nperson){
     
theta[j] ~ dnorm(0, 1);


  
for (i in 1:nitem){
      
Y[j, i] ~ dbern(prob[j, i]);


ppg[j,i] <- exp(weightg[i]*theta[j]- bg[i,g[i]]);

ppwd[j,i] <- exp(weightwd[i]*theta[j]- bwd[i,wd[i]]);

pptq[j,i] <- exp(weighttq[i]*theta[j]- btq[i,tq[i]]);

num[j,i] <- (pw[i] + pg[i]*ppg[j,i] + pwd[i]*ppwd[j,i] + ptq[i]*pptq[j,i])

den[j,i] <- (1+weightg[i]*ppg[j,i] + weightwd[i]*ppwd[j,i] + weighttq[i]*pptq[j,i]);
      
prob[j, i] <- num[j,i]/den[j,i];



for(k in 1:nt){
   
bg[i,k] ~ dnorm(0, .5);


bwd[i,k] ~ dnorm(0, .5);


btq[i,k] ~ dnorm(0, .5);
   
}

bg[i,2] <- 0;

bwd[i,2] <- 0;

btq[i,2] <-0;

}

}
}

有什么建议没

问题已解决

问题怎么解决的？