There is a simple relationship between Ln(X) and Log(X)
If Y = aLn(X) then Y = 2.303*a*Log(X)
The value 2.303 is more exaclty given by =1/LOG(EXP(1))



see also
http://www.stfx.ca/people/bliengme/E...&%20LOGEST.htm
http://www.stfx.ca/people/bliengme/E...Polynomial.htm

--
Bernard V Liengme
www.stfx.ca/people/bliengme
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"Greg" wrote in message
...
Is there anyway to get a common log trendline for an EXCEL graph. I know
how
to get the natural (ln) log trendline but I need a common log
trendline/line
equation in order to properly analyze my ELISA experiment.