similar to: sd help

I need some help for a curious question of a friend of mine. She usually does some experiments (3-5 repeats for each exp) and then she calculates mean and standard deviation. In microsoft excel she writes something like the following sample mean sd a 1.25 0.35 b 2.65 0.65 c 3.45 0.50 She can do a vertical barplot graph just giving mean value and specifying the

Hi All, I have a question regarding contingency tables. I would like to calculate the mean and standard deviation of a continuous variable from my own dataset based on the percentages of a contingency table I obtained from a scientific article. dataset<- data.frame(cbind(case=rep(0:1,5), x1=c(1:10), x2=c(0:9))) contingency_table<- matrix(c(100, 75, 65, 85, 90, 87), nrow=3, ncol=3) In

Dear Contributors I would like to perform this operation using a loop, instead of repeating the same operation many times. The numbers from 1 to 4 related to different groups that are in the database and for which I have the same data. x<-c(1,3,7) datiP1 <- datiP[datiP$city ==1,x]; datiP2 <- datiP[datiP$city ==2,x]; datiP3 <- datiP[datiP$city ==3,x] datiP4 <-

I cannot file suggestions on bugzilla, so writing here. As far as I can tell, the manual help page for ``sd`` ?sd does not explicitly mention that the formula for the standard deviation is the so-called "Bessel-corrected" formula (divide by n-1 rather than n). I suggest it should be stated near the top. I would also suggest (feature request!) that either - a population standard

Dear list, I am using R 2.1.1 on a Fedora 3 Linux, 32 bit PC. If I compute the aggregated mean and the standard deviation I get standard deviation values for factors where the mean was not computed. It seems to me that this is somehow related to the NA values. But I don't quite understand what is going wrong? Could it be related to the data import already? Some of the imported data got the

How might one calculate standard deviation, row-wise, for the numeric values in a data frame such as this one V1 V2 V3 V4 V5 1 rs11089130 0.4565 0.4574 0.4569 0.4572 2 rs738829 0.6548 0.6519 0.6448 0.6549 3 rs915674 0.7503 0.7500 0.7517 0.7502 and place the standard deviation in a 6th column called “std_dev”? Regards, Jim [[alternative HTML version deleted]]

How do I trim a matrix to exclude columns that have no standard deviation? Thanks, Chris [[alternative HTML version deleted]]

hi could you help me to solve this issue Question: Using command rweibull(100,8,15), simulate n = 100 realizations from Weibull(8; 15) distribution. Using the simulated sample, compute the sample mean, variance and standard deviation of these observations. I am trying like this sim<-rweibull(100,8,15) # simulated sample SM<-mean(sim) # simulated sample mean var(sim) # variance

Any help with this problem would be greatly appreciated: I need to produce a custom plot i haven't come across in R. Basically, I want to show means, 1st standard deviation and 5th and 95th percentiles visually, using something resembling a boxplot. Is it possible to completely customize a boxplot so that it shows means as the bar (instead of, not as well as medians), standard deviations at

In "An Introduction to R" Version 3.3.1, in "4.2 The function tapply() and ragged arrays", after stderr <- function(x) sqrt(var(x)/length(x)) , there is a note in brackets: Writing functions will be considered later in [Writing your own functions], and in this case was unnecessary as R also has a builtin function sd(). The part "in this case was unnecessary as R also

dear Researchers, i am looking for a function to plot a barplot for each mean value and the related standard deviation, and i can close my week. This is an example of my data set. really Thanks in advance for any help or suggestions Gianni My.mean <- data.frame(Mean=c(0.4108926,0.3949009,0.4520346, 0.4091665,0.4664066,0.3048296,0.4297226,0.4056383,

Dear R help; I'll preface this by saying that the example I've provided below is pretty long, turgid, and otherwise a deep dive into a series of functions I wrote for a simulation study. It is, however, reproducible and self-contained. I'm trying to do my first simulation study that's quite big, and so I'll say that the output of this simulation as I'd like it to be is

Hi: we have following setup: 1. 2.6.16-33-based Xen 3.0.3/Xen-3.0.4 DOM-0 kernels. 2. Using LILO-mbootpack from USB we boot Xen-->DOM-0 setup 3. We mount harddisk and try to install xp.hvm While,we are successful with FCs as DOM-U, for XP we get, VBD (768) could not be connected. We do have max_loop count to 64 and enough loop devices. Note that above error is consistent on both 3.0.3

Hi, I want to do a meta-analysis with count data for treatement/control cases. Mi problem is that I need to use zero values (an informative zero value) for the mean and standard deviation for one of the treatement, but R has a problem: "Studies with zero values for sd.e or sd.c get no weight in meta-analysis". I can agroup the case by Family (byvar=Family). ¿Can you help me? Thanks!

Dear R-users I am trying to recompile a CRAN package on Windows 32. Rtools for 2.14 (that is the version I am running) and miktex were sucessfully installed on my machine. Problems: a) hydroGOF is a CRAN package, but R CMD check does not work on it. C:\Users\eduardo\Documents\R_tests2>R CMD check hydroGOF * using log directory 'C:/Users/eduardo/Documents/R_tests2/hydroGOF.Rcheck'

Dear community Using after_stat() I was able to visualise ggplot with standard deviations instead of a confidence interval as seen in the R help. p1<-ggplot(data = MS1, aes(x= Jahr, y= QI_A,color=Bio, linetype=Bio)) + geom_smooth(aes(fill=Bio, ymax=after_stat(y+se*sqrt(length(y))), ymin=after_stat(y-se*sqrt(y))) , method = "lm" , formula = y ~ x +

Dear r-help, Function sd calculates the standard deviation 'with (n-1) denominator'. Are there any alternatives with n denominator? Thank you very much. -- Best regards Wladimir Eremeev mailto:wl at eimb.ru

need a version of sd [or var] to return population standard deviation (using n rather than n-1 denominator) that will operate on a dataframe containing missings, i.e. unequal n's. any ideas? thx, ted. ---------------------------------------- Ted (Edwin) Blew tblew@ets.org -------------------------------------------------- This e-mail and any files transmitted with it may contain

Hi, I would like to put the mean and + / - the standard deviation as lines on the x axis of a histogram. My attempts using the histogram function have been unable to do this. My searches are unsucessful on this subject. Any ideas are appreciated. Thanks stemp <- 5 6 5 5 5 5 6 5 m <-5.25 stanD <- 0.46291005 using windows xp R 2.6 --------------------------------------------------

sselamat wrote: > > Hi, > Everytime I try to get the standard deviation of a vector and enter > command of sd(x), i get a reply > Error: could not find function "sd" > Can someone help me please? > Thanks. > > Hmmm. Please provide more information, it's hard to imagine how this could happen. Results of sessionInfo() ??? Here's the only way I