Logarithmic regression Calculator

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

Logarithmic regression: y=A+Bln(x)
    1. (input by clicking each cell in the table below)

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

Logarithmic regression
[1-4] /4Disp-Num
[1]  2018/11/05 13:33   Male / 20 years old level / High-school/ University/ Grad student / Useful /
Purpose of use
Obtaining a more exact correlation between pitot tube position in a square air duct and the flow speed for the purpose of finding the volumetric flow rate of air in said duct. I'm a University senior pursuing a B.S. in Mechanical Engineering in a Thermo-Fluid Systems Lab.
[2]  2018/09/21 23:14   Male / 40 years old level / A teacher / A researcher / Very /
Purpose of use
Allocate awards.
[3]  2017/08/22 02:43   Male / 60 years old level or over / An engineer / Very /
Purpose of use
Frequency drift of a quartz crystal oscillator over extended time.
The Log Regression showed much better correlation to my data than the "built-in" used in excel chart curve-fit utility.

I am told there''s a better way to fit this particular data by using a "sum of log regressions", where 2 independent correlated variables that both follow log function can be modeled. I wold appreciate any feedback, but I''m afraid the details are unknown to me.
[4]  2017/05/16 09:28   Male / Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use


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