Posts: 64

Threads: 25

Joined: Oct 2013

Quote:

Just a note - the user fit is not really for fitting, rather for editing and adjusting the line in the plot more then anything.
There is not a best fit because the trig/logarithm ones can go so awry and take way too long. I suppose it could be limited to the well behaved fits or something...

TW

In my years of teaching, I have always thought that the best fit selection on previous HP calculators was not the best way to fit data .

It is sometimes misleading to students to use this selection when fitting data. Sometimes it is possible to get a higher regression coefficient or a smaller RMSE using the best fit of data to a linear function when the student is supposed to know(Since they have already been told this by their instructor or it is in the lab handouts,[which most of them do not read] that the phenomena should behave as a natural exponential function.

This the same kind of idea that Tim talked about as regards the CAS not being a Black Box,

I have students every semester that do not know that a numerical result is incorrect,even when they are told up front the possible range of values they should expect to get beforehand.

Charles Dickens had a quote about Medical Students,but I think it applies to students in general.