数学統計に詳しい人が語るコロナウイルス

[過去ﾛｸﾞ] 数学統計に詳しい人が語るコロナウイルス (1002ﾚｽ)
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479: １３２人目の素数さん [sage] 2020/05/09(土) 13:22:52.37 ID:oDT7bFgO

library(pwr)
library(rjags)
library(polspline)
par(bty='l')

n1=158
n2=78
pwr.2p2n.test(h=c(0.8,0.5,0.2),n1=n1,n2=n2,sig.level = 0.05,power=NULL,
alternative = "two.sided")
pwr.2p2n.test(h=NULL,n1=n1,n2=n2,sig.level = 0.05,power=0.80,
alternative = "two.sided")

s1=c(4,42,103) # improvement with Remdesivir
s2=c(2,18,45)  # improvement with placebo
# s1=103 ; s2=45 # Day 28
N=length(s1)   # 3
shape1=1     # prior parameter in dbeta
shape2=1

data=list(n1=n1,n2=n2,s1=s2,N=N,shape1=shape1,shape2=shape2)

modelString='
model{
# data
for(i in 1:N){
s1[i] ~ dbin(p1,n1)
s2[i] ~ dbin(p2,n2)
}
# parameter
delta <- p1 - p2
# priors
p1 ~ dbeta(shape1, shape2)
p2 ~ dbeta(shape1, shape2)
# sampling from priors
pri.p1 ~ dbeta(shape1, shape2)
pri.p2 ~ dbeta(shape1, shape2)
pri.delta <- pri.p1 - pri.p2
}
'
writeLines(modelString,'tmp.txt')
n.iter=1e5 ; thin=1
jagsModel=jags.model('tmp.txt',data,inits = NULL,n.chains=4,n.adapt=n.iter/5)
update(jagsModel)
codaSamples=coda.samples(jagsModel,c('delta','pri.delta'),n.iter,thin)
# plot(codaSamples)
coda2summary(codaSamples)
js=as.data.frame(as.matrix(codaSamples))
BEST::plotPost(js$delta,compVal=0,xlab=bquote(delta))
fit.post=logspline(js$delta)
fit.prio=logspline(js$pri.delta)
curve(dlogspline(x, fit.post), -2,2, lty=2, xlab=bquote(delta),ylab='Density')
curve(dlogspline(x, fit.prio), add=T)
(d.post=dlogspline(0,fit.post))
(d.prio=dlogspline(0,fit.prio))
legend('topright', bty='n', legend=c('δ≠0','δ=0'), lty=1:2)
abline(v=0,col=8)
points(c(0,0),c(d.post,d.prio),pch=c(1,19))
(BF01=d.post/d.prio)

http://rio2016.5ch.net/test/read.cgi/math/1582910321/479

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