jashobeam
Member
There has to be more to determining the size of a 5-shot group than simply measuring the distance between the two most widely spaced holes. If, for example, four bullets struck the target in the exact same spot making only one hole and the fifth bullet struck the target one inch away, the group size would not be one inch. Perhaps I am looking to measure the group's average as opposed to its spread? Any terminological assistance would be appreciated also.
From what I've concluded, in order to properly average the distance between points of impact I will need to add all distances between POI and then divide by the number of measurements taken. If using the above example of four shots printing only one hole and the fifth shot impacting one inch distant, I would calculate as follows:
Distance between 1st and 2nd shots: 0"
Distance between 1st and 3rd shots: 0"
Distance between 1st and 4th shots: 0"
Distance between 1st and 5th shots: 1"
Distance between 2nd and 3rd shots: 0"
Distance between 2nd and 4th shots: 0"
Distance between 2nd and 5th shots: 1"
Distance between 3rd and 4th shots: 0"
Distance between 3rd and 5th shots: 1"
Distance between 4th and 5th shots: 1"
Total relative distance: 4"
Divide TRD by number of measurements: 4"/ 10 = .4"
Is this the correct method? What method(s) do others use?
Can some mathematician or statistician help me with my terminology?
From what I've concluded, in order to properly average the distance between points of impact I will need to add all distances between POI and then divide by the number of measurements taken. If using the above example of four shots printing only one hole and the fifth shot impacting one inch distant, I would calculate as follows:
Distance between 1st and 2nd shots: 0"
Distance between 1st and 3rd shots: 0"
Distance between 1st and 4th shots: 0"
Distance between 1st and 5th shots: 1"
Distance between 2nd and 3rd shots: 0"
Distance between 2nd and 4th shots: 0"
Distance between 2nd and 5th shots: 1"
Distance between 3rd and 4th shots: 0"
Distance between 3rd and 5th shots: 1"
Distance between 4th and 5th shots: 1"
Total relative distance: 4"
Divide TRD by number of measurements: 4"/ 10 = .4"
Is this the correct method? What method(s) do others use?
Can some mathematician or statistician help me with my terminology?