Plot Line Graph With Error Bars In R
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error bars Two within-subjects variables Note about normed means Helper functions Problem You error bar in r want to plot means and error bars for a dataset.
Error.bar Function R
Solution To make graphs with ggplot2, the data must be in a data frame, scatter plot with error bars in r and in “long” (as opposed to wide) format. If your data needs to be restructured, see this page for more information. Sample data barplot with error bars r The examples below will the ToothGrowth dataset. Note that dose is a numeric column here; in some situations it may be useful to convert it to a factor. tg <- ToothGrowth head(tg) #> len
Errbar R
supp dose #> 1 4.2 VC 0.5 #> 2 11.5 VC 0.5 #> 3 7.3 VC 0.5 #> 4 5.8 VC 0.5 #> 5 6.4 VC 0.5 #> 6 10.0 VC 0.5 library(ggplot2) First, it is necessary to summarize the data. This can be done in a number of ways, as described on this page. In this case, we’ll use the summarySE() function defined on that page, and also at the bottom of this page. (The code for the summarySE function must be entered before it is called here). # summarySE provides the standard deviation, standard error of the mean, and a (default 95%) confidence interval tgc <- summarySE(tg, measurevar="len", groupvars=c( by over 573 bloggers. 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View(mtcars) We begin by aggregating our data by cylinders and gears and specify that we wa Diet & Nutrition (28) Education (1) Evolution (35) Human Ecology (75) Infectious Disease (66) LaTeX (5) Primates (9) R (12) science (17) Social Network Analysis (17) http://monkeysuncle.stanford.edu/?p=485 Statistics (16) Teaching (10) Uncategorized (28) Meta Log in Entries RSS Comments RSS WordPress.org ← Latest Swine Flu Epidemic Curve for the United States Stanford Workshop in Biodemography → http://stats.stackexchange.com/questions/114388/plotting-line-graph-with-error-bar-in-r-from-cross-tabulated-data Plotting Error Bars in R August 24th, 2009 · 52 Comments · R One common frustration that I have heard expressed about R is that there is no automatic error bar way to plot error bars (whiskers really) on bar plots. I just encountered this issue revising a paper for submission and figured I'd share my code. The following simple function will plot reasonable error bars on a bar plot. PLAIN TEXT R: error.bar <- function(x, y, upper, lower=upper, length=0.1,...){ if(length(x) != length(y) | length(y) !=length(lower) | length(lower) with error bars != length(upper)) stop("vectors must be same length") arrows(x,y+upper, x, y-lower, angle=90, code=3, length=length, ...) } Now let's use it. First, I'll create 5 means drawn from a Gaussian random variable with unit mean and variance. I want to point out another mild annoyance with the way that R handles bar plots, and how to fix it. By default, barplot() suppresses the X-axis. Not sure why. If you want the axis to show up with the same line style as the Y-axis, include the argument axis.lty=1, as below. By creating an object to hold your bar plot, you capture the midpoints of the bars along the abscissa that can later be used to plot the error bars. PLAIN TEXT R: y <- rnorm(500, mean=1) y <- matrix(y,100,5) y.means <- apply(y,2,mean) y.sd <- apply(y,2,sd) barx <- barplot(y.means, names.arg=1:5,ylim=c(0,1.5), col="blue", axis.lty=1, xlab="Replicates", ylab="Value (arbitrary units)") error.bar(barx,y.means, 1.96*y.sd/10) Now let's say we want to create the very common plot in reporting the results of scientific experiments: adjacent bars representing the treatment and the control w Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Cross Validated Questions Tags Users Badges Unanswered Ask Question _ Cross Validated is a question and answer site for people interested in statistics, machine learning, data analysis, data mining, and data visualization. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top plotting line graph with error bar in R from cross tabulated data up vote 1 down vote favorite I am wondering how could I line plot mean with error bar of cross tabulated data in R package. My data looks like this Mean Stage Treatment breaker green pink red turning cont 0.06779080 0.1964575 0.010335260 0.005861540 0.05828315 FRM 0.17211680 0.1853831 0.021794200 0.013183020 0.09467819 KNO3 0.24755945 0.2863050 0.007866763 0.002554247 0.06097948 LFR 0.08053258 0.1287083 0.008566730 0.000000000 0.07710268 salt 0.38564291 0.4419331 0.050551620 0.001115087 0.14508939 Standard deviation Stage Treatment breaker green pink red turning cont 0.01504616 0.14157770 0.003498454 0.0037076134 0.032316651 FRM 0.02710538 0.03422274 0.017164023 0.0143484928 0.058139975 KNO3 0.05372195 0.12865178 0.003552846 0.0006738978 0.001983925 LFR 0.04366554 0.05611974 0.009180117 0.0000000000 0.029396442 salt 0.03035888 0.12908778 0.028818513 0.0004681397 0.050566535 data-visualization share edited Sep 4 '14 at 21:39 Dan 230111 asked Sep 4 '14 at 21:30 umesh acharya 369 locked by whuber♦ Aug 6 '15 at 12:35 This question exists because it has historical significance, but it is not considered a good, on-topic question for this site, so please do not use it as evidence that you can ask similar questions here. This question and its answers are frozen and cannot be changed. More info: help center. Error bars representing what? Computed how? –Glen_b♦ Sep 5 '14 at 9:15 Hi Glen_b thanks for responding on my second question. If you correctly remember my first question, then you provided me a script to produce cross tab of mean and sd from factorial design data. the table above derived from same script like with(Chlordata, tapply(Chlorophyll, lPlot Mean And Standard Deviation In R