我想提取z
在 stanfit 对象转换后的数据块中f
。是否可以?
library(rstan)
m <- stan_model(model_code = '
data{real x;}
transformed data{real z; z = chi_square_rng(x); }
parameters {real y;}
model {y ~ normal(z,1);}')
f <- sampling(m, data=list(x=1), iter = 100)
我会添加一个新值generated quantities
像这样:
library(rstan)
m <- stan_model(model_code = '
data{real x;}
transformed data{real z; z = chi_square_rng(x); }
parameters {real y;}
model {y ~ normal(z,1);}
generated quantities {real zhat = z;}')
f <- sampling(m, data=list(x=1), iter = 100)
这将返回有效值
print(f, pars = "zhat")
mean se_mean sd 2.5% 25% 50% 75% 97.5% n_eff Rhat
zhat 0.16 0 0 0.16 0.16 0.16 0.16 0.16 2 0.98
您可以提取值,只是为了显示一些结果:
> extract(f)[["zhat"]]
[1] 0.16445 0.16445 0.16445 0.16445 0.16445 0.16445
[7] 0.16445 0.16445 0.16445 0.16445 0.16445 0.16445
[13] 0.16445 0.16445 0.16445 0.16445 0.16445 0.16445
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