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] /52Disp-Num
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[1]  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
[2]  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.
[3]  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.
[4]  2018/08/13 14:22   Male / 40 years old level / - / A little /
Purpose of use
research
[5]  2018/05/22 06:31   - / - / - / - /
Bug report
Every calculation that I have done with your site has given me mixed up data. Your a and c values are switched, other than that confusing part, your site is great. Please fix that one piece everything else is helpful.
[6]  2018/05/22 06:17   Female / Under 20 years old / Elementary school/ Junior high-school student / A little /
Purpose of use
Help on HW
Bug report
a =/= 12.9285... a = 0.5833...
c =/= 0.5833... c = 12.9285

Values of a and c are mixed up, b is correct.
[7]  2018/05/14 04:18   Female / 30 years old level / Others / Useful /
Purpose of use
Helping son with Advanced Algebra homework (calculator with regression analysis needed)
Comment/Request
The inputs were simple and it''s a great tool. If possible, please show the value of the max or min on the graph and the coordinating numbers below for more analysis. Keep up the good work!
[8]  2018/04/10 05:40   Male / Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
Python quadratic regression calculator
[9]  2018/03/21 04:49   Female / Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
Finding the correlation between musical notes and their wavelengths because I got bored in my engineering class.
[10]  2018/03/14 05:23   Male / - / An engineer / Very /
Purpose of use
Building a stepper motor based antenna elevation mechanism for aiming antennas for moon bounce communication. Formula is used to calculate number of steps required to achieve desired elevation angle. Platform movement is not linear so this is perfect for adjusting the number of steps to get from one angle to another.

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