Question

where can I find a best line fit calculator?

Answer 1

You're on one ;-)

Answer 2

TI-83+/TI-84 can do it

Answer 3

? what TI..A PROGRAM?

Answer 4

(10, 150) (20, 275) (30, 340) (40, 400) (50, 475)

Title: Intersection Cars
Horizontal axis: Minutes elapsed
Vertical axis: Total cars passing through
this is what they give me

Answer 5

Do you have a TI-83+ Calculator?

Answer 6

nope

Answer 7

What calculator do you have?

Answer 8

:) scientific

Answer 9

You can use an computer free version of the TI-84+

Answer 10

I mean , is there a website where I can use one?

Answer 11

http://www.ticalc.org/archives/files/fileinfo/372/37211.html

Answer 12

5 terms, so a 4th order polynomial... and no scientific calculator can't do this and no zepp unless you have the software for it TI-83's can't do it that I recall (not vanilla).

It's a matter of software.

Answer 13

Let me show you :)

Answer 14

http://puu.sh/J5ih

Here you go

Answer 15

There are 5 coordinates so you expect a quintic function (5 terms, x^4 being the highest)

http://www.wolframalpha.com/input/?i=curve+fit+%2810%2C+150%29+%2820%2C+275%29+%2830%2C+340%29+%2840%2C+400%29+%2850%2C+475%29

\[-\frac{7}{48000}x^4+\frac{19}{800}x^3-\frac{653}{480}x^2+\frac{311}{8}x-125\]

Answer 16

Perfect line fit is \(\large y=7.75x+95.5\)

Answer 17

Not that's not a perfect fit, it's an approximate fit.

Answer 18

I thought that was statistics :|

Answer 19

No?

Answer 20

You can choose any shape, @zepp. Even a logarithmic, sine, etc. shape. The point is to get it close. A polynomial function is the most accurate, typically. For more points

Answer 21

@agentx5 http://im.glogster.com/media/4/15/69/2/15690243.gif

Answer 22

Look at the link above @zepp... To Wolfram Mathematica's processing of the coordinates. It creates a curve that exactly goes through all the points.

Answer 23

The asker is asking for the best line fit, not the actual curve

Answer 24

Yeah that's a LINEAR curve fit. The shape depends on what you want. They are BOTH lines.

Answer 25

@Nana3456 What kind of line do you want?

Answer 26

best line fit :)

Answer 27

One is a line of a polynomial curve, the other is a y=mx+b approximation that is good enough in most applications but does not go though all 5 points. Best fit means the shape that most closely matches.

Answer 28

yes

Answer 29

In the case of a physics Ohm's Law lab you'd expect to use exponential, linear, and logarithmic. In the case of financial statistics you'd use a linear curve fit. In the case of a harmonics question with a cyclic pattern (i.e.: music software) you'd use a sinusoidal curve fit.

It depends on the context ladies & gents!

Answer 30

O.o!

Answer 31

So now back from @zepp to you @Nana3456 , this data you are trying to fit. Are you wanting closest match value for the points between or are you trying to derive something useful like the slope or y-intercept that has other meaning?

Answer 32

you guys lost me ! Sorry o.O?

Answer 33

In short, there's more than one way to do a curve fit. I didn't mean to go technical here on you @Nana3456 , but I had to answer/justify more than one question :-D

Answer 34

They ask me to Draw the line of best fit and to Write the equation for the line of best fit in standard form.

(10, 150) (20, 275) (30, 340) (40, 400) (50, 475)

Answer 35

hehe

Answer 36

Still don't get it :/

Answer 37

http://www.mathsisfun.com/definitions/line-of-best-fit.html

Everywhere, the line of best fit is a linear function, and what you typed in Wolfram is 'curve' and not 'line', @agentx5

Answer 38

Here both of you take a look at the two graphs together:

http://www.wolframalpha.com/input/?i=plot+ {-%287+x^4%29%2F48000%2B%2819+x^3%29%2F800-%28653+x^2%29%2F480%2B%28311+x%29%2F8-125+%2C+7.75x%2B95.5}