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  1. Y

    Accuracy testing my new stock

    I don't mean to say I'd mix the ammo - just that I might repeat the test with a different kind of ammo to see if the results are any different. I also have an ulterior motive for 20-shot groups, since I've also been researching how to measure the statistical significance of the difference...
  2. Y

    Accuracy testing my new stock

    Hey folks! Within the next few weeks (+/- depending on work stuffs) I'll be doing a side-by-side test to see if replacing my factory non-accustock with an accufit accustock makes my Savage 16 LWH more accurate. It's going to be fairly simple (20 rounds with the old stock v 20 rounds with the...
  3. Y

    Tics not Tik Toc

    +1 for permethrin, in case anyone still wasn't convinced :). One caveat: once it's dry, permethrin is harmless to pets, but the liquid form is highly toxic to cats, so if you have them just make sure they don't have access to your gear while it's drying. Conversely, you can spray it directly...
  4. Y

    Statistics for differentiating between groups?

    It matters because the mean radius has a well-established interpretation in the shooting world, as it defines the Circular Error Probable and the military and many other research bodies have established ways of inferring your likelihood of hitting your target based on previous measurements of...
  5. Y

    Statistics for differentiating between groups?

    How do you figure this?
  6. Y

    Statistics for differentiating between groups?

    Are you saying that, given a big enough n, the average size of n 2-shot groups gives you the same number as the mean radius of a single group of size 2n??
  7. Y

    Statistics for differentiating between groups?

    A big part of what I'm trying to say is that these two methods (calculating average radius and calculating the average distance between two-shot groups) absolutely do not accomplish the same thing, unless by "same thing" you mean that both are measures of precision. Sure, they're both that, but...
  8. Y

    Statistics for differentiating between groups?

    Returning to this: it doesn't matter how many groups you shoot. Groups with fewer shots will always average smaller sizes than groups with more shots. If you shoot more groups and take the average, you'll get a better average, but you'll still only be measuring the average size of your n-shot...
  9. Y

    Statistics for differentiating between groups?

    OK.
  10. Y

    Statistics for differentiating between groups?

    This is a bit ironic to say only a few posts after telling me to spend more time practicing my technique and less time worrying about ammo.
  11. Y

    Statistics for differentiating between groups?

    How does the situation change with more groups?
  12. Y

    Statistics for differentiating between groups?

    And yet here you are, commenting on a stats thread :ROFLMAO:
  13. Y

    Statistics for differentiating between groups?

    Apologies if I was tearing down a straw man. The issue I'm getting at, which from what I can tell is widely misunderstood in the shooting world, is this: We shoot practice/testing groups in order to try and figure out how confident we can be that we'll hit our target when push comes to shove...
  14. Y

    Statistics for differentiating between groups?

    No, you have to do it my way. Ya know, once I figure out my way from talking to people on the internet.
  15. Y

    Statistics for differentiating between groups?

    You were warned in the OP ;)
  16. Y

    Statistics for differentiating between groups?

    You're not limiting the amount of environmentally induced variance by shooting fewer shots in each group. You're simply not observing the variance, which is basically like saying ignorance is bliss. This is, in point of fact, one of the most widespread and dangerous misunderstandings I...
  17. Y

    Statistics for differentiating between groups?

    Ah, I see what you're getting at Brent. I am thinking of this from a different angle though. Let's say I buy a few boxes of Nosler e-tip factory ammo (load A) and a few boxes of Hornady superformance CX factory ammo (load B) for my 7mm-08. For the sake of argument, let's say I have an indoor...
  18. Y

    Statistics for differentiating between groups?

    I'm not sure how you're differentiating between testing groups and testing loads here. Can you elaborate or provide an example?
  19. Y

    Statistics for differentiating between groups?

    I finally came back around to this, and I'm curious what you mean by needing more groups. Can you elaborate? So far the best option I can see for comparing two groups of n shots is to measure the radius of each shot and then compare the two distributions with a Wicoxon Rank Sum test, which...
  20. Y

    Statistics for differentiating between groups?

    I'd love to read that essay, if you still have a copy. I've forgotten how to do a proper power calculation to figure out how many samples need to be taken for the CLT to apply in any given case, but I remember the rule of thumb was thirty samples. So, we're talking about 60 rounds per load in...

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