On 11-01-27 14:24, Ben Bolker wrote:
Ben Boyadjian <benjy_cy_21 <at> hotmail.com> writes:
Double post?
Hello I am trying to solve these problems and I am not allowed to use loops or
ifs.
1st Question
My first question is that I have generated 100 random numbers from the uniform
distribution then
A)add only the negative integers.
B)add elements until the first appearance of a negative element.
I know how to choose the negative elements for A but how to find integers?
x <- c(1, 1.3)
x==round(x, 0)
If this is the standard uniform U(0,1) distribution (which I assume
from your phrase "*the* uniform distribution" (emphasis added))
then there will be no integers in the sample ... ??
And I dont know what to do for B.
2nd Question
Simulate 1000 observations from the student-t distribution with 3 degrees of
freedom and then calculate
the truncated mean by excluding bottom 5% and top 5%.
Looks like homework questions, which are not answered on this list.
Please read the posting guide; if these are *not* homework questions,
please give us a plausible context. (Even if these are not homework
questions, the posting guide asks that you "do your homework" in a
broader sense by indicating what steps you have taken to solve your
problem on your own before posting.)
One hint for the second question: ?rt
Rather ugly and long winded, but works:
z <- rt(1000, 3)
q <- quantile(z, c(.05, .95))
mean(z[z>q[1] & z<q[2]])
good luck,
Ben Bolker
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Sascha Vieweg, saschav...@gmail.com
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