EEasley Posted November 10, 2011 Share Posted November 10, 2011 Hi- I am adding scatter data to a GTPlot reaction path that I created in REACT. I would like to include error bars on the scatter data, but I am not sure how to go about adding the standard deviations in the spreadsheet. I have already calculated the standard deviation of each analyte in Excel for major cations and anions, and then I am using the reported standard deviation by GeoTech, who rents the multimeter I used to measure field pH and temperature. Basically, I would like to simply add that the pH has a standard deviation of +/- 0.2 pH units and that temp has a standard deviation of 0.15 degrees C. Is there a simple way to just add in the standard deviation, or do I have to enter the standards and measured values in the GSS spreadsheet (as described in the user guide). My main concern is that I am only using reported standard deviation values from the equipment provider for pH and temperature, as I didn't run any calibrations myself (but now I am thinking I should have!). Please let me know if you have any suggestions! Thanks! Elisabeth Easley Quote Link to comment Share on other sites More sharing options...
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