Recent content by Dthomas3523

If we want to get technical, you'd still only use STDEV.P if you were never going to make anymore of that ammo again. As if you do, or plan to, that 1000 rounds becomes a sample by default. It also depends on "why" you want to analyze the information. If its purely to see what *happened* past...

As long as you don't try to compare an SD calculated with P and one calculated with S, you'd still come to same conclusion in a comparative analysis. As far as shooting 3 rounds in general, if you're attempting to make any major decisions, it doesn't matter if you use S or P, your sample size...

Agreed. Zero difference. Unless someone can come up with a scenario I'm unable to imagine.

No prob. Though I don't think you will make bad ammo if you use STDEV.P as it's going to be very close. There's an argument that could be made that 5 rounds made and tested before making say 200 rounds may not have a good chance to be a fair representation of the 200 not made. As you would...

Essentially all the N-1 denominator is doing is adding in variability. Just on a very basic logical level, if you're planning on using the data to decide to pick a recipe to make more ammo, then it's logical to conclude there will be more variations in your long term data. I think most anyone...

Your question is worded slightly confusing. I'm assuming you are planning on using STDEV.P and using N as the denominator? If so, you are using the entire "population" of the ammo you loaded. You are saying that is all the ammo that you will ever produce like that. Which is fine. If that is...

This basically just comes down to semantics and philosophy. Let's say you take 10 different recipes for a cartridge and make five rounds each. Each of those five rounds makes up the entire population of that ammo for now. You run them over your chrono....you can use population SD under the...

Here is the general reasoning that most seem to agree with: Since you're taking a sample of five rounds from each recipe group, the data collected from each group would represent a sample. In this case, it's appropriate to use the sample standard deviation to analyze the variation in the speeds...

Every chrono except garmin is using sample. Labradar, Magneto, Fx, Oehlar....etc. Reason being is that it's still considered a sample if you intend to make more ammo based on the recipe and process used for the ammo you tested. This logic has been run by several with graduate level statistics...

Hello, did you ever get a response from Garmin? Curious to hear their opinion of why they chose STDEV.P if they defend their choice. Thanks