Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Two different SD's. Which one is correct?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Hugnot" data-source="post: 2975190" data-attributes="member: 115658"><p>[ATTACH]521636[/ATTACH][ATTACH]521644[/ATTACH]</p><p></p><p>Two different data sampling types. I interpreted the data as a population as there were 3 measurements. The other method would be to interpret the data as a sample, but no other data was available.</p><p></p><p>This resulted in the sum of squares, 4.047 being divided by N or 3 for a population or N-1 for a sample like 2.</p><p></p><p>My spread sheet shows a sum of squares value of 4.047, and a variance of 2.023 (estimated variance via division of population minus 1)</p><p>This agrees with your calculations. Gathering more data will reduce the 1.4 SD that was displayed by the Magneto Speed.</p><p></p><p>Actual MS data calculations were unknown, but MS treated it as a sample, probably expecting more data. <u>The difference was not caused by "rounding up" it was caused by two different data sampling methods - population (like everything) vs sample (part of everything). Or dividing sum of squares by N-1 (3-1) or N (3).</u></p><p></p><p>I enter MS data into my spreadsheet(s) so I can look & compare. The results have adequate accuracy despite whole number data entries. Open Office is much easier to use than On-Line Excel.</p><p></p><p>So sorry about the pasting remark - I got a history of dealing with data treachery. A good example of which is faking electronic ballot images used for verification. My bad<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused :confused:" loading="lazy" data-shortname=":confused:" /></p></blockquote><p></p>
[QUOTE="Hugnot, post: 2975190, member: 115658"] [ATTACH alt="Screenshot (807).png"]521636[/ATTACH][ATTACH alt="Screenshot (811).png"]521644[/ATTACH] Two different data sampling types. I interpreted the data as a population as there were 3 measurements. The other method would be to interpret the data as a sample, but no other data was available. This resulted in the sum of squares, 4.047 being divided by N or 3 for a population or N-1 for a sample like 2. My spread sheet shows a sum of squares value of 4.047, and a variance of 2.023 (estimated variance via division of population minus 1) This agrees with your calculations. Gathering more data will reduce the 1.4 SD that was displayed by the Magneto Speed. Actual MS data calculations were unknown, but MS treated it as a sample, probably expecting more data. [U]The difference was not caused by "rounding up" it was caused by two different data sampling methods - population (like everything) vs sample (part of everything). Or dividing sum of squares by N-1 (3-1) or N (3).[/U] I enter MS data into my spreadsheet(s) so I can look & compare. The results have adequate accuracy despite whole number data entries. Open Office is much easier to use than On-Line Excel. So sorry about the pasting remark - I got a history of dealing with data treachery. A good example of which is faking electronic ballot images used for verification. My bad:confused: [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Two different SD's. Which one is correct?
Top