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Very Hot Topic (More than 25 Replies) Statistics and NRA accuracy testing. (Read 6904 times)
joeb33050
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Re: Statistics and NRA accuracy testing.
Reply #15 - Sep 28th, 2018 at 4:35pm
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JLouis wrote on Sep 28th, 2018 at 4:18pm:
Unless I am missing something the IBS is related to 600yd. Benchrest shooting but I could be wrong. If so it might make more sense but it also really does not pertain to most of us. JoeB please clarify what statistics we are actually looking at it is now a bit more confusing on what exactly is being pointed out?

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JLouis


J;
The IBS .pdf file is too large to post here, I just tried. This is the 2017 group IBS 100 and 200 yard national match. All the data I used is 100 and 200 yard group data.

I have all the data, will be happy to send some or all to anyone. email me at joeb33050@yahoo.com and I'll send the files.

joe b.
  
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joeb33050
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Re: Statistics and NRA accuracy testing.
Reply #16 - Sep 28th, 2018 at 4:37pm
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marlinguy wrote on Sep 28th, 2018 at 2:15pm:
I guess I don't get it, or don't care to.


If you don't get it, I'd be happy to help.
If you don't care, that's fine.
joe b.
  
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JLouis
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Re: Statistics and NRA accuracy testing.
Reply #17 - Sep 28th, 2018 at 4:47pm
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Thanks for the clarification JoeB and highly appreciated but I will also stick to my original comment. But I am also interested in what the NRA might have to say even though I might not agree with it. 

JLouis
  
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joeb33050
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Re: Statistics and NRA accuracy testing.
Reply #18 - Sep 28th, 2018 at 4:52pm
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JLouis wrote on Sep 28th, 2018 at 4:47pm:
Thanks for the clarification JoeB and highly appreciated but I will also stick to my original comment. But I am also interested in what the NRA might have to say even though I might not agree with it. 

JLouis


The 2017 IBS report is here:

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JLouis
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Re: Statistics and NRA accuracy testing.
Reply #19 - Sep 28th, 2018 at 5:25pm
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Thank you JoeB highly appreciated on my behalf and I do intend to review it but might not comment on it? 

JLouis
  
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Jeff_Schultz
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Re: Statistics and NRA accuracy testing.
Reply #20 - Sep 28th, 2018 at 5:34pm
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joeb33050 wrote on Sep 28th, 2018 at 11:21am:

I consider the NRA results to be suspect-perhaps false.


A mighty thin evidence.  
[/quote]

It just got thicker
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[/quote]
That's complete nonsense! I just looked at the scores from the latest match in Camillus, NY from the J Louis post. 1st place was .209; 15th place was just over .3 and 29th place was just over .4. 1" + groups at 100 yds in IBS competition? It never happened.
  
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joeb33050
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Re: Statistics and NRA accuracy testing.
Reply #21 - Sep 29th, 2018 at 6:48am
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Jeff_Schultz wrote on Sep 28th, 2018 at 5:34pm:
joeb33050 wrote on Sep 28th, 2018 at 11:21am:

I consider the NRA results to be suspect-perhaps false.


A mighty thin evidence.  


It just got thicker
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[/quote]
That's complete nonsense! I just looked at the scores from the latest match in Camillus, NY from the J Louis post. 1st place was .209; 15th place was just over .3 and 29th place was just over .4. 1" + groups at 100 yds in IBS competition? It never happened.
[/quote]

Yes, IBS 100 yard 5-shot groups >1" (almost) never happen, and 5 group aggs happen less often.

I never said that they do.
Years ago I made a computer model of group sizes; from 2 to 10 shots per group. This will simulate ex 200,000 5-shot groups.
Model + some algebra and I made a table of ratios, 2-10 shots per group, 2-10 groups per set.
To check the arithmetic and model, I kept records of largest group/smallest group in my shooting. My record avg looked like the model/algebra expected avg, so I figured the arithmetic was correct.

Then, lately, I checked CBA  records for 3 years. Looked ok.
Data was scarce, so to American Rifleman, and NRA data looked very different. ?????????????////


Then to IBS data, looks like mine and CBA.

What we're measuring is largest group/smallest group in a set of groups, ex 1"/.5" = 2.00 in a set of 5 groups. We expect 1.91, get 2.00.

Mine, CBA and IBS suggest the arithmetic is correct, NRA is off and I can find no explanation.

There are no group sizes in the tables above.
  
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joeb33050
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Re: Statistics and NRA accuracy testing.
Reply #22 - Sep 29th, 2018 at 6:52am
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This is the table of largest/smallest group sizes expected.

  
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calledflyer
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Re: Statistics and NRA accuracy testing.
Reply #23 - Sep 29th, 2018 at 9:52am
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I bet you know some card tricks too. This is just smoke and smell.
  
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joeb33050
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Re: Statistics and NRA accuracy testing.
Reply #24 - Sep 29th, 2018 at 11:08am
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calledflyer wrote on Sep 29th, 2018 at 9:52am:
I bet you know some card tricks too. This is just smoke and smell.


So;
Do you not understand, AND not agree?
Or do you understand, AND not agree?

An important distinction to the thinking person.

Let's see, called flyer? This is for you.


  
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calledflyer
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Re: Statistics and NRA accuracy testing.
Reply #25 - Sep 29th, 2018 at 3:03pm
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Just don't think it's anything to bother figgerin' out. What would I improve by doing so?
  
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JLouis
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Re: Statistics and NRA accuracy testing.
Reply #26 - Sep 29th, 2018 at 3:46pm
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Ignore it and move on instead ridiculing the poster who has interest in it as might others.
  
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