Re: am stuck with quadratic function

[Macy]

"...best quadratic fit..."

You didn't specify WHAT deems a 'best fit'

Probably want best fit as the sqrt of the sum of squared errors
but sometimes there are 'weighted' criteria, assigning importance to the data 
in different manners
there is an old DOS program that will do the former, instantly, while trying to 
plot the data, but as with most polynomial solutions it weights the answers 
'away' from the origin, in other words, larger numbers take precedent NOT 
percentage numbers.

So begs the question, what EXACT criteria is meant by 'best fit'?



--- address@hidden wrote:

From: Yud <address@hidden>
To: address@hidden
Subject: am stuck with quadratic function
Date: Mon, 26 Aug 2013 03:22:21 -0700 (PDT)

Hello guys i need your help for a quadratic function assignment. the question
reads as follow:

the sales figures for a business are as follow for the first six months of
the year:
40,000$, 44000$,  52000$, 64000$, 80000$, 84000$. the owner beleives that
the sales curve can be approximated by a quadratic function. find the best
quadratic fit to the data, and use it to estimate the projected sales for
the rest of the year.

thanks a lot in assisting me for this one. I need the code that need to be
input to Octave to acheive the solutions.

many thanks in advance...
yud



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