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How to show the critical difference (CD)/ least significant difference (LSD) in a chart

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By C V Singh


Researchers and Scientists usually need to show LSD within the graphics to explain the effect of different treatments. It is easier to show the standard errors in charts or graphs using Microsoft Excel program but difficult to show the LSD as program has options for standard error but not for LSD. If one represents the treatment difference and explains it with standard error it does not convey the exact meaning. LSD can be shown in a graph easily following few simple steps as shown below.

Step 1. Prepare the table and leave one row blank between treatments and LSD rows..

Step 2. Insert either a line or Bar diagram and select the data in the Microsoft Excel worksheet.

Step 3. In the blank row (between treatment and LSD row), put a value higher than the maximum data value shown for production. Here we placed 22 (Max. value=17.2)

Step 4.  Click on the chart and select the data (Include the blank row which you have just filled with value 22. Chart will show straight line for this data series in straight line chart but a bar column in bar chart. Click on this data series and change bar chart to line chart.

Step 5. Now right click on the added line and click "format data series". 

Now select "Y Error Bar" and select the custom button.

Now click in the blank space of "+" button enter the LSD vales for all the years and pree the enter button. Repeat the same for "-" button

Step 6. This is your last step. Right click on data series and select pattern.

Under the line menu, click "none" and also select "none" under the marker value.

This procedure is for Office 2003. You can show a bar column in place of line using Office 2007.



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