把参数结果带回原方程,得不到对应的P3,P10耶,请问哪里出错了,谢谢!
theta = optim(c(1,1), model, control = list(reltol=1e-99))
theta
percent <- function(P) {
L=theta$par[1];
S=theta$par[2];
P50=3455;
P50*(1+L*S*qt(P,1379))**(1/L)
}
percent(c(0.0228,0.03,0.1,0.25,0.5,0.75,0.9,0.97))
结果:
[1] NaN NaN NaN 943.6284 3455.0000 5971.4147 8239.6427 10482.0722