# ab-Exponential regression Calculator

## Analyzes the data table by ab-exponential regression and draws the chart.

 ab-Exponential regression: y=ABx
 （input by clicking each cell in the table below） data 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit
 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$\normal\ ab{\tiny -}Exponential\ regression\vspace{10}\\(1)\ mean:\ \bar{x}={\large \frac{{\small \sum}{x_i}}{n}},\hspace{10}\bar{lny}={\large \frac{{\small \sum}{lny_i}}{n}}\\[10](2)\ trend\ line:\ y=AB^x,\hspace{10} B=exp{\normal \frac{Sxy}{Sxx}},\hspace{10} A=exp{\bar{lny}-\bar{x}lnB}\\[10]\\(3)\ correlation\ coefficient:\ r=\frac{\normal S_{xy}}{\normal sqrt{S_{xx}}sqrt{S_{yy}}}\\\hspace{20}S_{xx}={\large \frac{{\small \sum}(x_i-\bar{x})^2}{n}}={\large \frac{{\small \sum} x_i^2}{n}}-\bar{x}^2\\\hspace{20}S_{yy}={\large \frac{{\small \sum}(lny_i-\bar{lny})^2}{n}}={\large \frac{{\small \sum} lny_i^2}{n}}-\bar{lny}^2\\\hspace{20}S_{xy}={\large \frac{{\small \sum}(x_i-\bar{x})(lny_i-\bar{lny})}{n}}={\large \frac{{\small \sum} x_i lny_i}{n}}-\bar{x}\bar{lny}\\$
ab-Exponential regression
 [1-10] /41 Disp-Num5103050100200
[1]  2018/11/13 04:37   Male / Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
To enjoy myself to
Comment/Request
[2]  2018/11/08 06:00   Male / Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
Math Assignment
[3]  2018/10/26 06:46   Male / Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
mathproject
[4]  2018/08/03 04:20   Male / 40 years old level / Others / Useful /
Purpose of use
Had data set of micro transaction spending on android game to fit a line to.
Comment/Request
Larger graph would be nice
[5]  2018/07/23 08:46   Female / Under 20 years old / Elementary school/ Junior high-school student / Very /
Purpose of use
homewrok
[6]  2018/05/20 23:44   Male / Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
Homework
[7]  2018/04/26 09:15   Male / Under 20 years old / Elementary school/ Junior high-school student / Useful /
Comment/Request
you should allow the user to make negative inquries
[8]  2018/04/23 08:48   Female / Under 20 years old / High-school/ University/ Grad student / A little /
Purpose of use
Schoolwork
[9]  2018/04/18 13:22   Male / Under 20 years old / High-school/ University/ Grad student / A little /
Purpose of use
Homework
Comment/Request
Good, but no work to show how it is done.
[10]  2018/04/17 01:36   Female / Under 20 years old / High-school/ University/ Grad student / Useful /
Purpose of use
research project

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