Error Bars Log Graph
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scale Subject: error bars in log-log scale From: Marco Date: 12 Sep, 2002 08:55:41 Message: 1 of 6 Reply to this message Add author graph with error bars in excel 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
Graph With Error Bars In R
(De... Date: 12 Sep, 2002 13:20:21 Message: 2 of 6 Reply 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
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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 https://www.graphpad.com/support/faq/plotting-the-geometric-mean-with-geometric-sd-error-bars/ sampled from a lognormal distribution. Notice that the distribution is not symmetrical. The http://labs.physics.dur.ac.uk/skills/skills/logscales.php 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 error bars 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 graph with error 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
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