B "Half of normal distribution"

zasvitim
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Hello.

Is there a name for distribution that describes "broken" Galton box like this?
And distribution formula..

Edit:
I've also attached how it looks like in simulation.

Thanks.
 

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zasvitim said:
Hello.

Is there a name for distribution that describes "broken" Galton box like this?
And distribution formula..

Thanks.
Yes, skip the "of": half-normal distribution.

I guess, your example of the halved Galton Board is better described by the truncated normal distribution.
 
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zasvitim said:
No, it actually looks different - like this:
You mean a bit like this:

525px-Half_normal_pdf.svg.png


I can only see that the parameters differ.
 
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fresh_42 said:
You mean a bit like this:

View attachment 356862

I can only see that the parameters differ.
It's value grows from 0 as particle can not get there - gets out. It's definitely different behaviour.
 
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The Galton box was intended to show that the binomial distribution approached a normal distribution as the sample gets large. If your distribution differs significantly from the "half normal" due to a small sample, then you might call if a "half binomial". I see it called that on some internet web sites. But that name might be informal. I don't see any authoritative name for it. There are several references to "truncated binomial" and it looks like a reasonably well recognized name.
 
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zasvitim said:
It's vague grows from 0 as particle can not get there - gets out. It's definitely different behaviour.
As long as we don't have an equation, we are stuck in guesswork.
 
zasvitim said:
But aren't equations built by mathematicians?

Yes, but you are obviously not satisfied with what they came up with. I'm simply trying to quantify your dissatisfaction.
 
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