[疑难杂症]哪位大神帮忙把这段代码注释一下?

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收藏 2014-06-12

毕业论文里用到马尔可夫链蒙特卡罗模拟方法模拟跳扩散模型的参数，打算用openbugs来进行模拟，但是看了一些别人的代码后，还是没理清楚openbugs的代码里一些符号和句子的意思。
比如下面这段代码，里面dpois，sumNumNeigh是什么意思？？能不能有哪位大神帮忙把这段代码注释一下，感激不尽！！！

#MODEL
model
{
for (i in 1:N) {
O ~ dpois(mu)
log(mu) <- log(E) + alpha0 + alpha1 * X/10 +
b[i
# Area-specific relative risk (for maps)
RR <- exp(alpha0 + alpha1 * X/10 + b)
}
# CAR prior distribution for random effects:
b[1:N] ~ car.normal(adj[], weights[], num[], tau)
for (k in 1:sumNumNeigh) {
weights[k] <- 1
}

# Other priors:
alpha0 ~ dflat()
alpha1 ~ dnorm(0, 1e-05)
tau ~ dgamma(0.5, 5e-04)
# prior on precision
sigma <- sqrt(1/tau)
# standard deviation
}
#DATA
list(N = 56, O = c(9, 39, 11, 9, 15, 8, 26, 7, 6,
20, 13, 5, 3, 8, 17, 9, 2, 7, 9, 7, 16, 31, 11, 7, 19, 15,
7, 10, 16, 11, 5, 3, 7, 8, 11, 9, 11, 8, 6, 4, 10, 8, 2,
6, 19, 3, 2, 3, 28, 6, 1, 1, 1, 1, 0, 0), E = c(1.4, 8.7,
3, 2.5, 4.3, 2.4, 8.1, 2.3, 2, 6.6, 4.4, 1.8, 1.1, 3.3, 7.8,
4.6, 1.1, 4.2, 5.5, 4.4, 10.5, 22.7, 8.8, 5.6, 15.5, 12.5,
6, 9, 14.4, 10.2, 4.8, 2.9, 7, 8.5, 12.3, 10.1, 12.7, 9.4,
7.2, 5.3, 18.8, 15.8, 4.3, 14.6, 50.7, 8.2, 5.6, 9.3, 88.7,
19.6, 3.4, 3.6, 5.7, 7, 4.2, 1.8), X = c(16, 16, 10, 24,
10, 24, 10, 7, 7, 16, 7, 16, 10, 24, 7, 16, 10, 7, 7, 10,
7, 16, 10, 7, 1, 1, 7, 7, 10, 10, 7, 24, 10, 7, 7, 0, 10,
1, 16, 0, 1, 16, 16, 0, 1, 7, 1, 1, 0, 1, 1, 0, 1, 1, 16,
10), num = c(3, 2, 1, 3, 3, 0, 5, 0, 5, 4, 0, 2, 3, 3, 2,
6, 6, 6, 5, 3, 3, 2, 4, 8, 3, 3, 4, 4, 11, 6, 7, 3, 4, 9,
4, 2, 4, 6, 3, 4, 5, 5, 4, 5, 4, 6, 6, 4, 9, 2, 4, 4, 4,
5, 6, 5), adj = c(19, 9, 5, 10, 7, 12, 28, 20, 18, 19, 12,
1, 17, 16, 13, 10, 2, 29, 23, 19, 17, 1, 22, 16, 7, 2, 5,
3, 19, 17, 7, 35, 32, 31, 29, 25, 29, 22, 21, 17, 10, 7,
29, 19, 16, 13, 9, 7, 56, 55, 33, 28, 20, 4, 17, 13, 9, 5,
1, 56, 18, 4, 50, 29, 16, 16, 10, 39, 34, 29, 9, 56, 55,
48, 47, 44, 31, 30, 27, 29, 26, 15, 43, 29, 25, 56, 32, 31,
24, 45, 33, 18, 4, 50, 43, 34, 26, 25, 23, 21, 17, 16, 15,
9, 55, 45, 44, 42, 38, 24, 47, 46, 35, 32, 27, 24, 14, 31,
27, 14, 55, 45, 28, 18, 54, 52, 51, 43, 42, 40, 39, 29, 23,
46, 37, 31, 14, 41, 37, 46, 41, 36, 35, 54, 51, 49, 44, 42,
30, 40, 34, 23, 52, 49, 39, 34, 53, 49, 46, 37, 36, 51, 43,
38, 34, 30, 42, 34, 29, 26, 49, 48, 38, 30, 24, 55, 33, 30,
28, 53, 47, 41, 37, 35, 31, 53, 49, 48, 46, 31, 24, 49, 47,
44, 24, 54, 53, 52, 48, 47, 44, 41, 40, 38, 29, 21, 54, 42,
38, 34, 54, 49, 40, 34, 49, 47, 46, 41, 52, 51, 49, 38, 34,
56, 45, 33, 30, 24, 18, 55, 27, 24, 20, 18), sumNumNeigh = 234)
#INITIAL VALUES
list(tau = 1, alpha0 = 0, alpha1 = 0, b = c(0, 0,
0, 0, 0, NA, 0, NA, 0, 0, NA, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))