logarithmic curve fittting regression
logarithmic curve fittting regression
(OP)
I am referring to the regression formulas as mentioned in the HP-67 Standard Pack. I have translated into basic language the regression formulas for Linear, Exponential and Power curve fitting and they all work alright. However I am unable to make the Logarithmic formula work and I think there must be some mistake in the formula itself. Can any oldtimer check, or supply another formula from another source? (which I am unable to locate).
I do not need the Basic program lines but just a correct formula which will work correctly for Logarithmic curve fitting.
Many thanks and I will do my best to reciprocate.
Pieropiero
I do not need the Basic program lines but just a correct formula which will work correctly for Logarithmic curve fitting.
Many thanks and I will do my best to reciprocate.
Pieropiero





RE: logarithmic curve fittting regression
<nbucska@pcperipherals.com>
RE: logarithmic curve fittting regression
the transformation to fit the data into a logarithmic curve works for values of independent variable where x>0 otherwise you will get an error message. Did you consider this fact?
m777182
RE: logarithmic curve fittting regression
RE: logarithmic curve fittting regression
Show us your input data -
Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora.
RE: logarithmic curve fittting regression
ftp.agilent.com/pub/mpusup/pc/hbw/hbwnotes/xstats.mb
the three formulas for linear, exponential, power regression all work alright but I am unable to make the logarithmic regression formula work
the problem is definitely not with negative input.
I am not sure if I can read the formula correctly.
Can someone explain step by step to me how I can properly
proceed? I am probably wrong in summatory handling
RE: logarithmic curve fittting regression
RE: logarithmic curve fittting regression