# Quadratic regression Calculator

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

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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 |

- Purpose of use
- Best quadratic fit from noisy Doppler data.
- Comment/Request
- Superb.

[1] 2018/11/30 02:33 Male / 60 years old level or over / A teacher / A researcher / Very /

- Purpose of use
- School Project
- Comment/Request
- Maybe show the Sxx, Sxy, Sxx2, Sx2x2, Sx2y values as well?

[2] 2018/11/26 04:24 Male / Under 20 years old / High-school/ University/ Grad student / Useful /

- Purpose of use
- curve fitting of power electronic converter manufacturer's power loss data to build a simple power loss compensation routine

[3] 2018/11/02 20:06 Male / 50 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.

[4] 2018/09/13 00:20 Male / 40 years old level / An engineer / Very /

- 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.

[5] 2018/08/19 00:51 Male / 60 years old level or over / A retired person / Not at All /

- Purpose of use
- research

[6] 2018/08/13 14:22 Male / 40 years old level / - / A little /

- 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.

[7] 2018/05/22 06:31 - / - / - / - /

- 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.

[8] 2018/05/22 06:17 Female / Under 20 years old / Elementary school/ Junior high-school student / A little /

- 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!

[9] 2018/05/14 04:18 Female / 30 years old level / Others / Useful /

- Purpose of use
- Python quadratic regression calculator

[10] 2018/04/10 05:40 Male / Under 20 years old / High-school/ University/ Grad student / Useful /

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