How To Plot Error Bars In Log Scale
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Logarithmic Error Propagation
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Error Bars On Log Scale Excel
New Message Advanced Search Help Trial software error bars in log-log scale Subject: error bars in log-log scale From: Marco Date: 12 Sep, 2002 08:55:41 Message: 1 of 6
Logarithmic Error Calculation
Reply to this message Add author to My Watch List View original format Flag as spam Anybody knows how can I plot error bars in a semi- or bi-logarythmic scale? The command errorbar does not help... thanx Marco Subject: error bars in log-log scale From: nospam@thank.you (De... Date: 12 Sep, 2002 13:20:21 Message: 2 of 6 Reply error bars on log graphs to this message Add author to My Watch List View original format Flag as spam On Thu, 12 Sep 2002 08:55:41 -0400, Marco
Support Answers MathWorks Search MathWorks.com MathWorks Answers Support MATLAB Answers™ MATLAB Central Community Home MATLAB Answers File Exchange errorbarlogx Cody Blogs Newsreader Link Exchange ThingSpeak Anniversary Home Ask Answer Browse standard error of log transformed data More Contributors Recent Activity Flagged Content Flagged as Spam Help MATLAB Central Community Home MATLAB Answers error propagation log base 10 File Exchange Cody Blogs Newsreader Link Exchange ThingSpeak Anniversary Home Ask Answer Browse More Contributors Recent Activity Flagged Content Flagged as Spam Help Trial software MathWorks https://www.mathworks.com/matlabcentral/newsreader/view_thread/39537 Support Team (view profile) 13,639 questions 13,639 answers 13,638 accepted answers Reputation: 2,612 Vote0 How can I use the ERRORBAR function with a logarithmic axis in MATLAB? Asked by MathWorks Support Team MathWorks Support Team (view profile) 13,639 questions 13,639 answers 13,638 accepted answers Reputation: 2,612 on 27 Jun 2009 Latest activity Commented on https://www.mathworks.com/matlabcentral/answers/99844-how-can-i-use-the-errorbar-function-with-a-logarithmic-axis-in-matlab by Ohad BarSimanTov Ohad BarSimanTov (view profile) 0 questions 0 answers 0 accepted answers Reputation: 0 on 27 Jul 2016 Accepted Answer by MathWorks Support Team MathWorks Support Team (view profile) 13,639 questions 13,639 answers 13,638 accepted answers Reputation: 2,612 255 views (last 30 days) 255 views (last 30 days) When I type the following at the MATLAB prompt, I get a an errorbar with a log x axis:x = 1:100; y = sin(x); e = std(y)*ones(size(x)); errorbar(x,y,e) set(gca,'xscale','log') However, the errorbars of the first point in the resulting figure extend much farther than the other errorbars. I would like a function that can account for the logrithmic X-axis and make all of the errorbars have a uniform width. 1 Comment Show all comments Ohad BarSimanTov Ohad BarSimanTov (view profile) 0 questions 0 answers 0 accepted answers Reputation: 0 on 27 Jul 2016 Direct link to this comment: https://www.mathworks.com/matlabcentral/answers/99844#comment_381798 This is what I got after using others comm
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Graphpad.com FAQs Find ANY word Find ALL words Find EXACT phrase Plotting the geometric mean with geometric SD error bars FAQ# 1910 Last Modified 26-September-2014 The figure below shows a plot of data sampled from a lognormal distribution. Notice that the distribution is not symmetrical. The graph on the left plots the individual data points and superimposes a horizontal line at the arithmetic mean, and error bars showing plus and minus one SD. This is a simple choice in Prism's Format Graph dialog. Showing the mean with SD error bars really does not do a great job of showing the variation in the data. If you only saw the mean and error bars (which many scientists like to plot) without the raw data, you would be mislead. If the data were more skewed, the SD might be large enough that the downward pointing error bar might go below the axis to a negative Y value. The graph in the middle plots the geometric mean along with the 95% confidence interval of that geometric mean. These error bars give you a good sense of how precisely you know the populationgeometric mean, but don't show the amount of scatter. The graph on the right uses a logarithmic axis. This is created in Prism by a setting in the upper right of the Format Axis dialog. The error bars show the arithmetic mean and the error bars show plus or minus one SD. The error bars are symmetrical in terms of the values they represent, but on a log scale the lower error bar is much longer. This still doesn't do a great job of showing variation. If the downward error bar would go to a negative value, Prism (starting with 6.05 and 6.0f) doesn't even show it at all (because negative values cannot be shown on logarithmic axes). What about plotting the geometric mean with the geometric SD? Prism doesn't do this automatically, but you can make it do so with a bit of work. To create the graphs below, I transformed all the values to their logarithms (base 10) using Prism's transform analysis. The Y axis of graph on the left shows the logarithms (the data that are actually plotted). The graph on the right plots antilogarithms instead, along with log spaced minor intervals. These settings are on the Format Axis dialog. The data are still logarithms. We just told Prism to label the Y axis with antilogarithms to make the graph easier to understand, and added log spaced minor ticks to emphasize the logarithmic nature of the axis. The error bars in both cases show the mean of the logarithms plus or minus one SD of the logarithms. In other words, these error bars plot the geometric SD. What is the geometric SD numerically?Run Prism's column statistics