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#1 2010-07-24 13:37:51
- George,Y
- Member
- Registered: 2006-03-12
- Posts: 1,379
probability integral
could you please solve
X'(y-Xβ)=0
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#2 2010-07-25 01:17:27
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: probability integral
Hi George,Y;
So:
Sorry George I was still working on it when I put the first piece in.
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 2010-07-25 01:35:21
- George,Y
- Member
- Registered: 2006-03-12
- Posts: 1,379
Re: probability integral
How da you do it
X'(y-Xβ)=0
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#4 2010-07-25 02:24:42
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: probability integral
Hi;
Say
This one I have in a table. Or you can figure it from the tables on wikipedia,
http://en.wikipedia.org/wiki/List_of_in … _functions
which have this integral.
Of course WA will do this for you, just enter:
integrate[E^(-y/2)/Sqrt[2*Pi*y],y,0,infinity] and you will get:
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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#5 2010-07-25 15:06:27
- George,Y
- Member
- Registered: 2006-03-12
- Posts: 1,379
Re: probability integral
Brilliant, bobbym.
I forgot how to use direct substition - time to pick calculus up.
X'(y-Xβ)=0
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#6 2010-07-25 16:55:03
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: probability integral
Hi George,Y;
Brilliant, bobbym.
If only those 2 words actually belonged together.
In this case a small substitution makes the integral close to those in a table.
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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#7 2010-07-31 15:18:47
- samuel12
- Member
- Registered: 2010-07-17
- Posts: 19
Re: probability integral
Bobbym, brilliant and modest
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#8 2010-07-31 16:50:48
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: probability integral
Actually, he is brave and mighty.
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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