He does wan a 'smoothed' curve... Like a least-squares approximarion to his datapoints, the curve does not neccesarily passes over them.
I don't know how to do this in excel... in the past I've used SPSS and matlab, but both are overkill.
Best regards, Santiago
Bob, If you have Excel, you should be able to set up a curve from your data sets. Enter and just let in plot away ( after you set up the initial input/output in curves)
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*From:* pure-silver-bounce@xxxxxxxxxxxxx [mailto: pure-silver-bounce@xxxxxxxxxxxxx] *On Behalf Of *BOB KISS *Sent:* Friday, September 01, 2006 8:37 AM *To:* Pure-Silver@Freelists. Org *Subject:* [pure-silver] D-LOG E CURVE DRAWING PROGRAM
*DEAR PURE SILVER,*
*Does anyone know of a curve drawing program that I can use to plot D-Log E curves from the densities that I read off the test strips I create with my step wedge? *
*To begin with I will use my densitometer. Later I may try it with my scanner but, for now, please let me know about a program where you can set the X axis at steps of .15 Log E units and the Y axis as Density and pump in the readings from my densitometer. I am hoping that there is a program that draws and smoothes the curve to fit the data.*
*Of course I would prefer a free download or to be told that it already exists in my computer hidden in some Windows accessories program but I will buy it if I must. *
*Thanks in advance. *
* CHEERS!*
* BOB*
* *
*Please check my website: http://www.bobkiss.com/ *
* *
*"Live as if you are going to die tomorrow. Learn as if you are going to live forever". Mahatma Gandhi*