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Deviation?
Help / Support / How-to's / Discussion related to PointBlank Software and External Ballistics in general
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ArXane
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Joined: Mar 17, 2009
Posts: 6

PostPosted: Thu Jul 05, 2012 9:03 am    Post subject: Deviation? Reply with quote

Does the software tell me somewhere what my standard deviation is?
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Vince
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Joined: May 25, 2005
Posts: 14141
Location: Brisbane AUSTRALIA

PostPosted: Thu Jul 05, 2012 8:56 pm    Post subject: Re: Deviation? Reply with quote

Can't say I've ever seen that function in there mate.

That is usually one of the functions of a chronograph. To get a standard deviation you would need to be able to enter the velocity of every round you fire and I don't believe you can do that with PB.

Cheers, Vince

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DallanC
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Joined: Jan 18, 2005
Posts: 3251
Location: Utah

PostPosted: Thu Jul 05, 2012 9:15 pm    Post subject: Re: Deviation? Reply with quote

The old version used to calculate it. Its on my TODO list to bring it into version 2.0 ... I havent had any requests for it till now, but I can bump it up a bit and get it in... its not a big deal to add.


-DallanC
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ArXane
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Joined: Mar 17, 2009
Posts: 6

PostPosted: Thu Jul 05, 2012 9:55 pm    Post subject: Re: Deviation? Reply with quote

DallanC wrote:
The old version used to calculate it. Its on my TODO list to bring it into version 2.0 ... I havent had any requests for it till now, but I can bump it up a bit and get it in... its not a big deal to add.


-DallanC

That would be great. Thanks!
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SyberShooter
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Joined: Jul 23, 2010
Posts: 93
Location: Arizona

PostPosted: Fri Jul 06, 2012 11:53 am    Post subject: Re: Deviation? Reply with quote

I usually calculate all that with my Excel reloading log (including MAD, ES, & 95% SD). Since the straight SD is technically only 65.4% of the expected variance range, I like to calculate the SD to the 95% level (2x SD) which I then add/subtract from the median velocity to arrive at an expected +- range that my reloads should fall within most of the time. Its a nice feature for some situations but in general the +/- velocity spreads can be eye opening (disappointing, alarming, scary etc) on otherwise good loads.
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DallanC
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Joined: Jan 18, 2005
Posts: 3251
Location: Utah

PostPosted: Tue Jul 10, 2012 2:17 pm    Post subject: Re: Deviation? Reply with quote

Ok I have this in and working. I will run a few more tests to double check for bugs then I will push up a new version, probably later tonight.


-DallanC
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