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Rifles, Reloading, Optics, Equipment
Reloading
? on ES / SD
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<blockquote data-quote="milanuk" data-source="post: 210576" data-attributes="member: 376"><p>So... does anybody here muck around calculating confidence intervals for their mean (average) velocities for comparing the sample mean to the population mean? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></p><p></p><p>Sorry, just finishing up a Stat 201 class. Being a bit of a type 'A' sort to begin with, and moderately proficient w/ Excel to boot... the class opened up a whole bunch of doors for wasting time analyzing data <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>Something to keep in mind... even if you have a small E.S. or 'range' of velocities for the shots fired - the E.S. of all the shots fired from your gun (or at least something like 99.7% of them) will likely be described by your average +/- 3x your stdev value. So if you have a E.S. of 10, most people would be happy, and ignore say, the SD of 4 or 5. Guess what. 5 x 6 = 30, and if you fire enough shots, (30 or more), you'll likely find thats more what your 'actual' ES is - 25-30fps - if you're lucky. In my experience, most of us start making excuses (bad batch of primers, chrono on the blink, wrong phase of the moon, etc.) once our velocities start straying from that tight little bundle of joy we started with. The truth can be ugly sometimes, but ignoring it won't make it go away <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="milanuk, post: 210576, member: 376"] So... does anybody here muck around calculating confidence intervals for their mean (average) velocities for comparing the sample mean to the population mean? :rolleyes: Sorry, just finishing up a Stat 201 class. Being a bit of a type 'A' sort to begin with, and moderately proficient w/ Excel to boot... the class opened up a whole bunch of doors for wasting time analyzing data :D Something to keep in mind... even if you have a small E.S. or 'range' of velocities for the shots fired - the E.S. of all the shots fired from your gun (or at least something like 99.7% of them) will likely be described by your average +/- 3x your stdev value. So if you have a E.S. of 10, most people would be happy, and ignore say, the SD of 4 or 5. Guess what. 5 x 6 = 30, and if you fire enough shots, (30 or more), you'll likely find thats more what your 'actual' ES is - 25-30fps - if you're lucky. In my experience, most of us start making excuses (bad batch of primers, chrono on the blink, wrong phase of the moon, etc.) once our velocities start straying from that tight little bundle of joy we started with. The truth can be ugly sometimes, but ignoring it won't make it go away ;) [/QUOTE]
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