Plot Mean And Standard Error In R
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error bars Two within-subjects variables Note about normed means Helper functions Problem You want to plot error bars in r plot means and error bars for a dataset. Solution
Summaryse R
To make graphs with ggplot2, the data must be in a data frame, and in barplot with error bars r “long” (as opposed to wide) format. If your data needs to be restructured, see this page for more information. Sample data The examples below
Ggplot2 Error Bars
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 supp dose #> 1 4.2 r calculate standard error 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("supp","dose")) tgc <
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Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each scatter plot with error bars in r other. Join them; it only takes a minute: Sign up Plot mean and standard deviation by category in R up vote 4 down vote favorite 1 I'm trying to plot a simple plot with mean and sd barrs http://cookbook-r.com/Graphs/Plotting_means_and_error_bars_(ggplot2)/ by three levels of a factor. After two hours of searching on the internet, then checking the Rbook and Rgraphs book I'm still not finding the answer. I think this is because is a very simple question... plus I do not understand very well how R works yet. I have a simple data frame with three columns: my categories, mean, sd. I would like to do a plot with the mean by category and its sd barrs, just http://stackoverflow.com/questions/24626280/plot-mean-and-standard-deviation-by-category-in-r like this one My dataframe looks like this color mean.temp sd black 37.93431 2.267125 red 37.01423 1.852052 orange 36.61345 1.339032 I'm so sorry for asking this dumb question but I sincerely couldn't find any simple answer to my simple question. Thank you very much in advance, (I will also appreciate any advice regarding basic literature about R plots). r plot mean share|improve this question edited Oct 16 '15 at 2:27 SwiftArchitect 16.6k55489 asked Jul 8 '14 at 7:42 Maria 4816 1 maybe this helps (if you don't mind using ggplot2): cookbook-r.com/Graphs/Plotting_means_and_error_bars_(ggplot2) –beetroot Jul 8 '14 at 8:04 Thank you! I'll take a look –Maria Jul 9 '14 at 7:47 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted Create a data.frame holding your data: foo <- data.frame(color=c("black","red","orange"), mean.temp=c(37.93431,37.01423,36.61345), sd=c(2.267125,1.852052,1.339032)) Now, we first plot the means as dots, making sure that we have enough room horizontally (xlim) and vertically (ylim), suppressing x axis annotation (xaxt="n") and all axis labeling (xlab="", ylab=""). plot(1:3,foo$mean.temp,pch=19,xlab="",ylab="",xaxt="n",xlim=c(0.5,3.5), ylim=c(min(foo$mean.temp-foo$sd),max((foo$mean.temp+foo$sd)))) Next, we plot the standard deviations as lines. You could also use three separate lines commands, which may be easier to read. This way, we first collect the data into matrices via rbind(). R will automatically turn these matrices into vectors and recycle them. The NAs are there so we don't join the end of one line to the
boxplot to summarize distributions. Means and standard errors are calculated from the raw data using describe. Alternatively, plots of http://www.personality-project.org/r/html/error.bars.html means +/- one standard deviation may be drawn. Usage error.bars(x,stats=NULL, ylab = https://www.quora.com/What-is-the-best-way-to-plot-mean-with-standard-error-in-bar-using-R "Dependent Variable",xlab="Independent Variable", main=NULL,eyes=TRUE, ylim = NULL, xlim=NULL,alpha=.05,sd=FALSE, labels = NULL, pos = NULL, arrow.len = 0.05,arrow.col="black", add = FALSE,bars=FALSE,within=FALSE, col="blue",...) Arguments x A data frame or matrix of raw data stats Alternatively, a data.frame of descriptive stats from (e.g., describe) ylab y label xlab error bars x label main title for figure ylim if specified, the limits for the plot, otherwise based upon the data xlim if specified, the x limits for the plot, otherwise c(.5,nvar + .5) eyes should 'cats eyes' plots be drawn alpha alpha level of confidence interval – defaults to 95% confidence interval sd if TRUE, draw one error bars in standard deviation instead of standard errors at the alpha level labels X axis label pos where to place text: below, left, above, right arrow.len How long should the top of the error bars be? arrow.col What color should the error bars be? add add=FALSE, new plot, add=TRUE, just points and error bars bars bars=TRUE will draw a bar graph if you really want to do that within should the error variance of a variable be corrected by 1-SMC? col color(s) of the catseyes. Defaults to blue. ... other parameters to pass to the plot function, e.g., typ="b" to draw lines, lty="dashed" to draw dashed lines Details Drawing the mean +/- a confidence interval is a frequently used function when reporting experimental results. By default, the confidence interval is 1.96 standard errors of the t-distribution. If within=TRUE, the error bars are corrected for the correlation with the other variables by reducing the variance by a factor of (1-smc). This allows for comparisons between variables. The error bars are norma
in bar using R?UpdateCancelAnswer Wiki1 Answer Hideyoshi MaedaWritten 210w agoif you like pretty pictures using ggplot2...have a look at this...http://wiki.stdout.org/rcookbook...327 ViewsView More AnswersRelated QuestionsHow do I use R gglopt to plot 3 sets in one plot?What is the meaning of the error "Error in terms.formula (formula) : '.' in formula and no 'data' argument" in R? This error came in when I wa...What's the best way to prepare a file of data for use in R to plot multiple overlaid scatterplots?In R programming, when you use apply function in the following way (apply (store.df, 2,mean-median) why does it return an error?How do I plot a bar graph in R?How do you apply a filter to bar plot counts in R?If I want to do some remote computing at home through a terminal, what is the best way to quickly view output of R plots?R (programming language): What is the most elegant plot you have made using "ggplot2"?Data Visualization: What is the easiest and most elegant way to get started with R plotting?How do I draw a bar graph using r language?What is the best way to communicate the results of data analysis using R language?Should I learn R or just use Python for meteorological / geographical graph plotting?What are the best ways to use Excel, R language, and other tools to find obscure trends in data?How do I plot a scatterplot using R language with plot command when one vector is having several NA values?How can I create the least squares regression (Minimum mean square error) line in R?What are some good resources for learning R?How does R plot its graphs? Using a backend like Gnuplot or completely autonomous?What is a way to plot decision tree boundaries with R?How can I add "dot plots" to a map using ArcGIS or R?Which R package should be used for forecasting and plotting by a stationary wavelet?Related QuestionsHow do I use R gglopt to plot 3 sets in one plot?What is the meaning of the error "Error in terms.formula (formula) : '.' in formula and no 'data' argument" in R? This error came in when I wa...What's the best way to prepare a file of data for use in R to pl