Error Bars On Log Scale Excel
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April 21st, 2008, 04:45 AM #1 gstuart Newbie Joined: Apr 2008 Posts: 3 Thanks: 0 Error bars on log-transformed plots? excel chart error bars Hello - I am a genetics researcher. I have a series
Excel Chart Error Bars 2010
of data points with errors (standard errors), that I wish to plot as a column plot with error excel chart error bars 2013 bars: GENE, AVG FOLD CHANGE, SE Gene1, 2193.10, 1200.74 Gene2, 96.28, 9.08 Gene3, 39.02, 22.51 Gene4, 5.88, 0.82 Gene5, -0.68, 0.33 Gene6, 1.14, 0.02 Gene7, -1.46, 0.16 Gene8, -1.56, 0.50 how to insert error bars in excel mac Gene9, -1.58, 0.10 Gene10, -1.88, 0.45 Gene11, -2.04, 0.45 Gene12, -6828.82, 975.41 Positive values are up-regulated genes; negative values are down-regulated genes (re: gene expression levels). I wish to plot this as a column plot on a log scale (y-axis) with negative values below the zero baseline, positive values above, and with the errors indicated. Something like: 1000 100 10
How To Put Error Bars In Excel Mac
* 1 * 0------------------- -1 * -10 * -100 -1000 but with bars instead of the asterisks - you get the idea. I can do this easily enough using MS Excel, by taking the log of the absolute value, multiplying the result by +1 or -1 (to restore the original "directionality" - i.e. up- or down-regulated). A couple of questions: (Q1) Is it "better" to use log (base 10) or ln (natural) log transformations? (Q2) How would I present the error bars - would I log (or ln) -transform the standard errors, for example, and plot these [or the absolute values of these, since the log of numbers <1 are negative; e.g. log(0.5) = -0.301)]? I tried finding the answer to these questions in Google, but I wasn't very successful. ... I would very much appreciate any comments regarding the log-transformation of data and plots of log-transformed data, particularly regarding error bars! Thank you! Sincerely, Greg :-) April 22nd, 2008, 01:06 PM #2 gstuart Newbie Joined: Apr 2008 Posts: 3 Thanks: 0 He
graphs can give a concise and compact form of representation, while graphs made poorly can be misleading and very confusing. Why use logarithmical graphs? If you find vertical error bars in excel yourself with data spread on an extremely large area, the graph will be how to add standard deviation bars in excel very compact and you may miss some sharp drops in values because of this. A semi-logarithmical graph is has
Logarithmic Error Propagation
one of the two axes (usually the abscissa) in a logarithmical form. The logarithmical base is usually 10, but can also be “e” or any other base. Well let's suppose you http://mymathforum.com/algebra/2903-error-bars-log-transformed-plots.html have the following table: X 1 2 5 10 20 50 100 200 500 1000 2000 Y 1 2 4 16 256 65536 4.29E+09 1.84E+19 3.4E+38 1.16E+77 1.3E+154 The corresponding Excel scatter chart is this: On the other hand, if you extract the logarithm of both X and Y rows you get this table: log_x 0 0.3 0.7 1 1.3 1.7 2 2.3 2.7 http://bubble.ro/Logarithmic_scale_graphs_in_Excel.html 3 3.3 log_y 0 0.3 0.6 1.2 2.41 4.82 9.63 19.27 38.53 77.06 154.13 And its corresponding graph: Does it make sense now? I thought so How to obtain the logarithmic graph Double click the axis that you want to be on a logarithmical scale. In the "Scale" tab, select the "Logarithmical Scale" option and click ok. Then, go to the Chart Options (in the Chart menu) and in the "Gridlines" tab check the "Minor gridlines" on the axes you want depending of the desired graph type: semi-logarithmical or logarithmical. That's it ! Hope this helps ! » Permalink Posted by: Nitro on March 18, 2006 at 14:51. » Comments Har har Very interesting. I never thought logarithmic scales would lighten up my life ;)... Posted by SunBeam on March 20, 2006 at 05:19 PM. Tip Just remember to use the normal values when you select source for the graphic, Excel does the log operation for you. Posted by Mika on March 21, 2006 at 01:18 AM. Hello, sort anoob here hello ladies and gents! I've been kind of lurking around. I love this site! thanks fo
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or remove error bars in a chart Applies To: Excel 2007, Word 2007, Outlook 2007, PowerPoint 2007, Less Applies To: Excel 2007 , Word 2007 , Outlook 2007 , PowerPoint 2007 , More... Which version do I have? More... Error bars express potential error amounts that are graphically relative to each data point or data marker in a data series. For example, you could show 5 percent positive and negative potential error amounts in the results of a scientific experiment: You can add error bars to data series in a 2-D area, bar, column, line, xy (scatter), and bubble charts. For xy (scatter) and bubble charts, you can display error bars for the x values, the y values, or both. After you add error bars to a chart, you can change the display and error amount options of the error bars as needed. You can also remove error bars. What do you want to do? Review equations for calculating error amounts Add error bars Change the display of error bars Change the error amount options Remove error bars Review equations for calculating error amounts In Excel, you can display error bars that use a standard error amount, a percentage of the value (5%), or a standard deviation. Standard Error and Standard Deviation use the following equations to calculate the error amounts that are shown on the chart. This option Uses this equation Where Standard Error s = series number i = point number in series s m = number of series for point y in chart n = number of points in each series yis = data value of series s and the ith point ny = total number of data values in all series Standard Deviation s = series number i = point number in series s m = number of series for point y in chart n = number of points in each series yis = data value of series s and the ith point ny = total number of data values in all series M = arithmetic mean Top of Page Add error bars On 2-D area, bar, column, line, xy (scatter), or bubble chart, do one of the following: To add error bars to all data series in the chart, click the chart area. To add error bars to a selected data point or data series, click the data point or data series that you want, or do the following to select it from a list of chart elements: Click anywhere in the chart. This displays the Chart Tools, adding the Design, Layout, and Format tabs. On the Format tab, in the Curre