Linear regression algorythms & project

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If anyone knows where i will get algorithms for linear regression & programs on data mining. I have to find out periodicity existing in shopping analysis & i have to find out error in periodicity of time ig. after purchasing one item approximately how many days another item got purchased.I have to find linear equation
y=ax+b.
f(x)=(24-x)/18*(sin(x)+1.5).
g(x)=f(x)/(ax+b).
It is a project of Cyclic model analysis on sequential patterns.(shopping project)if any link you know please give me.

Posted 19-Feb-11 17:41pm

Member 7685573

Updated 20-Feb-11 3:55am

#realJSOP

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Sandeep Mewara 19-Feb-11 23:49pm

on Google?

Albin Abel 20-Feb-11 0:42am

I am seeing this question second time. Google it, if couldn't find anything response back. I could give the algorithm for linear reg. But there is lot of codes available in net. If you don't understand them you ask specific questions

A basic statistics book gives you the steps. You can derive the algorithm from that steps too

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OriginalGriff · Answer 1 · 2011-02-19T21:03:00

Solution 1

Google is your friend: http://www.google.co.uk/search?sourceid=chrome&ie=UTF-8&q=algorithms+for+linear+regression[^]

Learn to use it: it is a lot quicker than asking a question.

Alternatively, look in any statistics book, and you will find the process outlined step-by-step.

Posted 19-Feb-11 21:03pm

OriginalGriff

Comments

Espen Harlinn 20-Feb-11 8:12am

Right :)

CPallini · Answer 2 · 2011-02-20T02:28:00

Solution 2

Usually the method of least squares http://en.wikipedia.org/wiki/Least_squares[^] is good enough for linear regression.

Member 7685573s wrote:
f(x)=(24-x)/18*(sin(x)+1.5).
g(x)=f(x)/(ax+b).

What's the role of the above functions?
:)

Posted 20-Feb-11 2:28am

CPallini

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Albin Abel 21-Feb-11 0:30am

Yes, least squares are the principle behind regression. But it is needed to remove the colinearity if present in the variables before performing regression for precise results in real world application. He has to tell what accurate level of regression coefficients he wants to derive. My 5

Member 13730025 · Answer 3 · 2018-03-16T12:00:00

Solution 3

Cost function: least squares
If you are using mat lab or a free version of matlab, you can utilize the cost function quite easily. Just make sure you have an instantaneous upstate for your function for every variance you test. You could also use the “normal function” if you don’t want to hard crack everything.

Posted 16-Mar-18 12:00pm

Member 13730025

Updated 16-Mar-18 12:26pm

Comments

Patrice T 16-Mar-18 18:35pm

you are 7 years too late.