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我是R新手,遇到优化问题。R中的优化
d <- c(0, 9.017, -9.017, 0, 9.017, 0, -8.579, -7.849, 0, 0, -7.849,
-9.017, 0, -7.849, -7.849, 0, 0, 0, 8.579, 1.168, 8.579, 8.579,
-7.849, 0.729, 8.579, 9.017, 0, -0.438)
x <- c(0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0,
1, 1, 0, 1, 1, 1, 0, 1)
log.like<-function (sigma){
theta = pnorm(d,mean=0,sd=sigma)
logl = sum(log((theta^x) * ((1-theta)^(1-x))))
-logl
}
optim(0,fn=log.like,method="L-BFGS-B",lower=0,upper=1)
它给了我下面的错误:
Error in optim(0, fn = log.like, method = "L-BFGS-B", lower = 0, upper = 1) :
L-BFGS-B needs finite values of 'fn'
这不是非常接近'glm(x〜d,family = binomial(link =“probit”))'...? –
我检查过了,实际上'g1 < - glm(x〜d,family = binomial(link =“probit”)); 1/coef(g1)'将解决这个问题。 –