Standard Deviation Question?

SD is figured using the difference of each data point from the average of all the data points. You cannot adjust the SD, as it requires recalculating a new average without the first three data points.
 
If you are familiar with Microsoft Excel, there is a standard deviation function in it. You can enter the data and it will calculate the SD for you.

Or, if you are using a CED chronograph, you can just delete the first three readings, or any particular reading, and it will calculate the SD based on what's left.

Fitch
 
Thanks appreciate the info.Was using an Oehler I can delete as Iam shooting,But I didn't catch this till later. And was curious as to how the "faster" first speeds had effected the SD.
 
Here is what I did,I guess we don't have Excel loaded.Or I could n't use it whatever.I went to the old stand by Machinary Handbook where I looked up the fomula.Ouch! then I thought how nice it would be to use The old Texas Instruments Ti-36.The manuel is long gone,So I pulled up thier web site.And down loaded pages 11,12.Now I can figure SD fairly painlessly.Jeff
 
Originally Posted By: JeffJonesHere is what I did,I guess we don't have Excel loaded.Or I could n't use it whatever.I went to the old stand by Machinary Handbook where I looked up the fomula.Ouch! then I thought how nice it would be to use The old Texas Instruments Ti-36.The manuel is long gone,So I pulled up thier web site.And down loaded pages 11,12.Now I can figure SD fairly painlessly.Jeff

Well done. A benefit of the TI-36 is that it's portable, can follow you to the range for real time data analysis. I do the same thing with my HP32SII.

Fitch
 


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