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Rifles, Reloading, Optics, Equipment
Reloading
Blackpilled by Hornaday #50, #52 - Statistics with Ontarget TDS and Taran
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<blockquote data-quote="RegionRat" data-source="post: 2970728" data-attributes="member: 57231"><p>Any chance there is a radius and diameter being swapped by accident somewhere?</p><p></p><p>Hang in there, double check your version against their (on Target TDS) individual radius values, and be patient while they answer your request. Lets see what they come back with.</p><p></p><p>In industrial settings, we tend to use CEP at a level set by specs and contracts. However, there is nothing wrong with using Mean Radius to test differences experimentally by using basic statistical tests.</p><p></p><p>The standard deviation of a sample is amplified by arbitrary convention, not by physics. It isn't real and it can over or under estimate when you extrapolate with it.</p><p></p><p>As for using SD population versus SD sample, as long as you are not switching back and forth or trying to extrapolate too far ahead, it won't matter which one you use as long as you do it the same for both treatments when comparing them and by using at least 15 or more shots for each.</p><p></p><p>Be careful when assuming that shot dispersion follows Normal Gaussian distribution. If you are zooming way down, it often doesn't. </p><p></p><p>That said, you can do just fine learning to shoot/load with normal distribution math. A student still needs to have very good workmanship and shooting skills that don't come from a screen or keyboard, so put an equal effort into the workshop and range time. Good Luck and have fun!</p></blockquote><p></p>
[QUOTE="RegionRat, post: 2970728, member: 57231"] Any chance there is a radius and diameter being swapped by accident somewhere? Hang in there, double check your version against their (on Target TDS) individual radius values, and be patient while they answer your request. Lets see what they come back with. In industrial settings, we tend to use CEP at a level set by specs and contracts. However, there is nothing wrong with using Mean Radius to test differences experimentally by using basic statistical tests. The standard deviation of a sample is amplified by arbitrary convention, not by physics. It isn't real and it can over or under estimate when you extrapolate with it. As for using SD population versus SD sample, as long as you are not switching back and forth or trying to extrapolate too far ahead, it won't matter which one you use as long as you do it the same for both treatments when comparing them and by using at least 15 or more shots for each. Be careful when assuming that shot dispersion follows Normal Gaussian distribution. If you are zooming way down, it often doesn't. That said, you can do just fine learning to shoot/load with normal distribution math. A student still needs to have very good workmanship and shooting skills that don't come from a screen or keyboard, so put an equal effort into the workshop and range time. Good Luck and have fun! [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Blackpilled by Hornaday #50, #52 - Statistics with Ontarget TDS and Taran
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