Quadratic regression Calculator

Analyzes the data table by quadratic regression and draws the chart.

Quadratic regression: y=A+Bx+Cx2

    1. (input by clicking each cell in the table below)
data 

Guidelines for interpreting correlation coefficient r :
  0.7<|r|≦1        strong correlation
  0.4<|r|<0.7     moderate correlation
  0.2<|r|<0.4     weak correlation
  0≦|r|<0.2         no correlation



Quadratic regression
[1-10] /59Disp-Num
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[1]  2019/03/21 10:49   Female / Under 20 years old / Elementary school/ Junior high-school student / Useful /
Purpose of use
Algebra 1 homework
Comment/Request
Add ability to make predictions from model.
[2]  2019/03/19 08:11   Female / Under 20 years old / High-school/ University/ Grad student / A little /
Purpose of use
Algebra 1 homework
[3]  2019/03/15 23:54   Male / Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
Pre-Calculus homework
Comment/Request
A+Bx+Cx² is not standard in anything I've seen, ax²+bx+c seems to be much more common
[4]  2019/03/08 10:18   Male / Under 20 years old / Elementary school/ Junior high-school student / Useful /
Purpose of use
Homework
Comment/Request
Make the results copy-pastable.
[5]  2019/02/13 10:12   Female / Under 20 years old / High-school/ University/ Grad student / A little /
Purpose of use
Algebra 2 homework
Comment/Request
Have the data table of the graph available. Also, the formula is not one proper order according to powers.
[6]  2018/11/30 02:33   Male / 60 years old level or over / A teacher / A researcher / Very /
Purpose of use
Best quadratic fit from noisy Doppler data.
Comment/Request
Superb.
[7]  2018/11/26 04:24   Male / Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
School Project
Comment/Request
Maybe show the Sxx, Sxy, Sxx2, Sx2x2, Sx2y values as well?
[8]  2018/11/02 20:06   Male / 50 years old level / An engineer / Very /
Purpose of use
curve fitting of power electronic converter manufacturer's power loss data to build a simple power loss compensation routine
[9]  2018/09/13 00:20   Male / 40 years old level / An engineer / Very /
Purpose of use
Used to find closest quadratic fit for the angle of swirl between jet engine combustion system and exhaust temperature as a function of power level.
Comment/Request
Loved that I could paste a 44 point data straight in from Excel. Nice. Worked perfectly.
[10]  2018/08/19 00:51   Male / 60 years old level or over / A retired person / Not at All /
Purpose of use
Seeing if Social Security benefits/age is a quadratic equation
Comment/Request
Gave me A=20,000 B=0 C=6. Nonsense results.
Perhaps your equations explode when B=0.
Maybe for small B, you need to expand the equation as a series.

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