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#1 2012-06-23 07:36:37
- amberzak
- Member
- Registered: 2012-03-16
- Posts: 80
Degrees of Freedom
Statistics this time.
I have a poisson distribution, and I am just trying to work out my degrees of freedom.
I have 7 columns of data. I have the mean. I have not worked out the variance yet. But I do have the total frequency.
So does the total expected frequency count as a constraint
In other words, is my degree of freedom 7-1=6 or 7-2=5
(it does make a difference because 7-1 means that it is a poisson distribution and 7-2 means it isn't)
Don't think outside the box. Think there is no box
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#2 2012-06-23 07:51:43
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Degrees of Freedom
Hi;
I could be wrong but degrees of freedom occur in chi square tests.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#3 2012-06-23 07:56:17
- amberzak
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- Registered: 2012-03-16
- Posts: 80
Re: Degrees of Freedom
Yes, thats what I'm doing. 
Sorry
Don't think outside the box. Think there is no box
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#4 2012-06-23 07:59:19
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Degrees of Freedom
It is usually 7 pieces of data = 7 - 1 = 6 df.
I would have to see the question to understand more.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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