Re: [R] Mean from confidence intervals

2011-01-29 Thread csrabak
Em 28/1/2011 20:15, Peter Francis escreveu: Dear List, I am not sure if A) this is possible or B) the correct place to ask. I am looking to find the mean - i have n, and the two-tailed confidence intervals 0.95& 0.25 with a p-value of 0.05. Can i find the mean from this data ? Thanks Pet

Re: [R] Mean from confidence intervals

2011-01-29 Thread David Winsemius
On Jan 29, 2011, at 5:21 PM, peterfran...@me.com wrote: > > Sorry for not being more explicit in my emails, the code I am using > was not generated by me therefore I was not in the position to share > it. > > Sorry if the information i have provided is insufficient or if I > have wasted peo

Re: [R] Mean from confidence intervals

2011-01-29 Thread peterfrancis
Sorry for not being more explicit in my emails, the code I am using was not generated by me therefore I was not in the position to share it. Sorry if the information i have provided is insufficient or if I have wasted peoples time. Basically I have the information listed below I.e n and the q

Re: [R] Mean from confidence intervals

2011-01-29 Thread David Winsemius
On Jan 29, 2011, at 9:39 AM, Peter Francis wrote: Dear all, The data is generated from 1000 random samples of a phylogenetic tree to calculate phylogenetic diversity. I sampled the tree 1000 times at with various species communities (600) to get a random PD per community. I then want to

Re: [R] Mean from confidence intervals

2011-01-29 Thread Peter Francis
Dear all, The data is generated from 1000 random samples of a phylogenetic tree to calculate phylogenetic diversity. I sampled the tree 1000 times at with various species communities (600) to get a random PD per community. I then want to test my observed PD with that of a random sample to test

Re: [R] Mean from confidence intervals

2011-01-28 Thread Joshua Wiley
Hi Peter, Do you know the formula used to calculate the confidence interval? I suspect it is possible with minimal algebraic manipulation of the CI formula to find what the mean is. Assuming a normal distribution (as David), then it is certainly possible to find. This wikipedia page might help:

Re: [R] Mean from confidence intervals

2011-01-28 Thread David Winsemius
On Jan 28, 2011, at 5:15 PM, Peter Francis wrote: Dear List, I am not sure if A) this is possible or B) the correct place to ask. I am looking to find the mean - i have n, and the two-tailed confidence intervals 0.95 & 0.25 with a p-value of 0.05. Can i find the mean from this data ? I

[R] Mean from confidence intervals

2011-01-28 Thread Peter Francis
Dear List, I am not sure if A) this is possible or B) the correct place to ask. I am looking to find the mean - i have n, and the two-tailed confidence intervals 0.95 & 0.25 with a p-value of 0.05. Can i find the mean from this data ? Thanks Peter ___