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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Two different SD's. Which one is correct?
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<blockquote data-quote="Hugnot" data-source="post: 2974611" data-attributes="member: 115658"><p>Magneto Speed calculated SD using some unknown values. What values did the Magneto Speed actually use to come up with a SD of 1.4? Magneto Speed shows a spread of 2 fps.</p><p></p><p>[ATTACH]521462[/ATTACH][ATTACH]521495[/ATTACH]</p><p>Values of, 2977.8, 2978.1 & 2980.4 were plugged in for SD = 1.161.</p><p></p><p>[ATTACH]521463[/ATTACH][ATTACH]521480[/ATTACH]</p><p></p><p>Values of 2978, 2980, & 2978 -- SD = .943</p><p>Equal SD values of .943 with my spreadsheet & the on-line calculator using whole numbers.</p><p></p><p>I was unable to come up with a SD = 1.4 using 2977.8, 2978.1, 2980.4. All 3 calculations show an <u>equal mean value of 2978.8</u> but Aloeus' has SD = 1.4 -- might be a problem with that. The 1.4 might have been pasted in/over.</p><p></p><p> M-Speed comes up with a SD of 1.4. I don't have much confidence in the MS SD of 1.4.</p><p></p><p>Use more values. Save all data & keep running the On-Line calculator, bigger data sets will provide more useful stats. Difficult to say if sample distribution is a normal distribution with only 3 data points.</p><p></p><p>Many think SD means a behavior deficit.<img class="smilie smilie--emoji" loading="lazy" alt="🤣" title="Rolling on the floor laughing :rofl:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f923.png" data-shortname=":rofl:" /></p></blockquote><p></p>
[QUOTE="Hugnot, post: 2974611, member: 115658"] Magneto Speed calculated SD using some unknown values. What values did the Magneto Speed actually use to come up with a SD of 1.4? Magneto Speed shows a spread of 2 fps. [ATTACH alt="Screenshot (802).png"]521462[/ATTACH][ATTACH alt="Screenshot (805).png"]521495[/ATTACH] Values of, 2977.8, 2978.1 & 2980.4 were plugged in for SD = 1.161. [ATTACH alt="Screenshot (803).png"]521463[/ATTACH][ATTACH alt="Screenshot (804).png"]521480[/ATTACH] Values of 2978, 2980, & 2978 -- SD = .943 Equal SD values of .943 with my spreadsheet & the on-line calculator using whole numbers. I was unable to come up with a SD = 1.4 using 2977.8, 2978.1, 2980.4. All 3 calculations show an [U]equal mean value of 2978.8[/U] but Aloeus' has SD = 1.4 -- might be a problem with that. The 1.4 might have been pasted in/over. M-Speed comes up with a SD of 1.4. I don't have much confidence in the MS SD of 1.4. Use more values. Save all data & keep running the On-Line calculator, bigger data sets will provide more useful stats. Difficult to say if sample distribution is a normal distribution with only 3 data points. Many think SD means a behavior deficit.🤣 [/QUOTE]
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Two different SD's. Which one is correct?
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