Re: [R] CI with sd
Hi On 19 Oct 2006 at 13:19, Ethan Johnsons wrote: Date sent: Thu, 19 Oct 2006 13:19:40 -0400 From: Ethan Johnsons [EMAIL PROTECTED] To: Chuck Cleland [EMAIL PROTECTED] Copies to: r-help@stat.math.ethz.ch Subject:Re: [R] CI with sd I thought of another interesting scenario, and I would just go ahead and ask this. I have a mean (i.e. 26.2) where the number of e coli samples is 250. The mean is already calculated, so it is a discrete value, not series. What fucntion can be used for the calc with CI i.e. 90%? With some sd value and assuming normal distribution 26.2+qnorm(.95)*sd/sqrt(250) 26.2-qnorm(.95)*sd/sqrt(250) as you can find in statistical textbooks. But without having sd value? HTH Petr thx much, ej On 10/19/06, Chuck Cleland [EMAIL PROTECTED] wrote: Ethan Johnsons wrote: Please let me ask you another quick question. I have results for e coli, and am trying to get 95% CI with the sd (1.783956). I got the result from another tool as (1.21, 3.42). But, I like to verify it with R. What function do you use for this? e.coli=c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) sd(e.coli, na.rm = FALSE) [1] 1.783956 Sorry for the newbie question. e.coli - c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) library(nlme) mod1 - gls(e.coli ~ 1) intervals(mod1) Approximate 95% confidence intervals Coefficients: lower est.upper (Intercept) 24.16206 25.5 26.90460 attr(,label) [1] Coefficients: Residual standard error: lower est.upper 1.204986 1.783956 3.417651 thx much ej __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Petr Pikal [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] CI with sd
Thank you so much. I see your point. ej On 10/20/06, Petr Pikal [EMAIL PROTECTED] wrote: Hi On 19 Oct 2006 at 13:19, Ethan Johnsons wrote: Date sent: Thu, 19 Oct 2006 13:19:40 -0400 From: Ethan Johnsons [EMAIL PROTECTED] To: Chuck Cleland [EMAIL PROTECTED] Copies to: r-help@stat.math.ethz.ch Subject:Re: [R] CI with sd I thought of another interesting scenario, and I would just go ahead and ask this. I have a mean (i.e. 26.2) where the number of e coli samples is 250. The mean is already calculated, so it is a discrete value, not series. What fucntion can be used for the calc with CI i.e. 90%? With some sd value and assuming normal distribution 26.2+qnorm(.95)*sd/sqrt(250) 26.2-qnorm(.95)*sd/sqrt(250) as you can find in statistical textbooks. But without having sd value? HTH Petr thx much, ej On 10/19/06, Chuck Cleland [EMAIL PROTECTED] wrote: Ethan Johnsons wrote: Please let me ask you another quick question. I have results for e coli, and am trying to get 95% CI with the sd (1.783956). I got the result from another tool as (1.21, 3.42). But, I like to verify it with R. What function do you use for this? e.coli=c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) sd(e.coli, na.rm = FALSE) [1] 1.783956 Sorry for the newbie question. e.coli - c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) library(nlme) mod1 - gls(e.coli ~ 1) intervals(mod1) Approximate 95% confidence intervals Coefficients: lower est.upper (Intercept) 24.16206 25.5 26.90460 attr(,label) [1] Coefficients: Residual standard error: lower est.upper 1.204986 1.783956 3.417651 thx much ej __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Petr Pikal [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] CI with sd
Please let me ask you another quick question. I have results for e coli, and am trying to get 95% CI with the sd (1.783956). I got the result from another tool as (1.21, 3.42). But, I like to verify it with R. What function do you use for this? e.coli=c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) sd(e.coli, na.rm = FALSE) [1] 1.783956 Sorry for the newbie question. thx much ej __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] CI with sd
Ethan Johnsons wrote: Please let me ask you another quick question. I have results for e coli, and am trying to get 95% CI with the sd (1.783956). I got the result from another tool as (1.21, 3.42). But, I like to verify it with R. What function do you use for this? e.coli=c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) sd(e.coli, na.rm = FALSE) [1] 1.783956 Sorry for the newbie question. e.coli - c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) library(nlme) mod1 - gls(e.coli ~ 1) intervals(mod1) Approximate 95% confidence intervals Coefficients: lower est.upper (Intercept) 24.16206 25.5 26.90460 attr(,label) [1] Coefficients: Residual standard error: lower est.upper 1.204986 1.783956 3.417651 thx much ej __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] CI with sd
Thx so much, Chuck. R is a reallt sweet tool to use.. I can try many things with i.e. intervals (gls(e.coli ~ 1), level=0.90). It is a great help. ej On 10/19/06, Chuck Cleland [EMAIL PROTECTED] wrote: Ethan Johnsons wrote: Please let me ask you another quick question. I have results for e coli, and am trying to get 95% CI with the sd (1.783956). I got the result from another tool as (1.21, 3.42). But, I like to verify it with R. What function do you use for this? e.coli=c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) sd(e.coli, na.rm = FALSE) [1] 1.783956 Sorry for the newbie question. e.coli - c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) library(nlme) mod1 - gls(e.coli ~ 1) intervals(mod1) Approximate 95% confidence intervals Coefficients: lower est.upper (Intercept) 24.16206 25.5 26.90460 attr(,label) [1] Coefficients: Residual standard error: lower est.upper 1.204986 1.783956 3.417651 thx much ej __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] CI with sd
I thought of another interesting scenario, and I would just go ahead and ask this. I have a mean (i.e. 26.2) where the number of e coli samples is 250. The mean is already calculated, so it is a discrete value, not series. What fucntion can be used for the calc with CI i.e. 90%? thx much, ej On 10/19/06, Chuck Cleland [EMAIL PROTECTED] wrote: Ethan Johnsons wrote: Please let me ask you another quick question. I have results for e coli, and am trying to get 95% CI with the sd (1.783956). I got the result from another tool as (1.21, 3.42). But, I like to verify it with R. What function do you use for this? e.coli=c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) sd(e.coli, na.rm = FALSE) [1] 1.783956 Sorry for the newbie question. e.coli - c(27.5,24.6,25.3,28.7,23,26.8,24.7,24.3,24.9) library(nlme) mod1 - gls(e.coli ~ 1) intervals(mod1) Approximate 95% confidence intervals Coefficients: lower est.upper (Intercept) 24.16206 25.5 26.90460 attr(,label) [1] Coefficients: Residual standard error: lower est.upper 1.204986 1.783956 3.417651 thx much ej __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
