house-ball wrote:
First, you should probably read "An Introduction to R" which comes with your R-installation.Hi,
Would you help me solve the following question? Thanks.
Question: If I try to set the probability=0.05 and find the approximate x. (The answer should be somewhere between 2.1782 and 2.1783.)
I write about this R program as follows but I don’t know how to get the value of x which is between 2.1782 and 2.1783.
As posed your question is ambiguous, but assuming you mean to say "normal distribution", you need
something like
qnorm(0.05)
or if you mean probability in the upper tail
qnorm(0.05, lower.tail=FALSE)
Then read ?qnorm
Kjetil halvorsen
library(mvtnorm)
value<-array(1000)
a<-array(1000)
a<-seq(2,3,by=0.001)
for(i in 1000)
{
x<-a[i]
value[i]<-2*(pmvnorm(lower=-Inf, upper=-x, mean=0, sigma=1)+
pmvnorm(lower=c(-x,-Inf),upper=c(x,-x),mean=0,corr=diag(2)*sqrt(0.5)))
if(value[i]-0.05<0.001)
print(x)
}
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