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Calibration graphs on Numbers

by JonelleVillar / February 16, 2011 3:18 AM PST

I am new to Numbers and need help to understand the difference I found today between an equation generated in Excel and the one generated in Numbers. I was making a graph to show potentials against the log of an ion concentration. Excel gave it to me right away in the lab, but at home I got an entirely different answer in Numbers.

Any ideas? I would love to stick with one spreadsheet program, preferably mastering iWork.

Thanks.

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WIthout seeing the equation.
by R. Proffitt Forum moderator / February 17, 2011 3:42 AM PST

It would be hard to guess why the result changed.

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Calibration graphs on Numbers
by JonelleVillar / February 17, 2011 5:57 AM PST

Hi R. I had two short columns of values x axis is the log of solution concentration, and y axis is the potentials from the ion selective electrodes (I was measuring fluoride content).
0.70 0.190
1.00 0.175
1.40 0.153
1.70 0.137

When I put this values in the graph for Excel, I got the equation : Y= -0.0533x + 0.2277
When I came home and put the same values into Numbers, I got - well I just rechecked and got the same value. I must have chosen the wrong type of chart. New days bring new solutions.

Anyway R, if you have words of encouragement as to why I should use Numbers over Excel, I am open to hear what you have to say.

Thanks for responding.
Jonelle

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Just one and then it's not a great one.
by R. Proffitt Forum moderator / February 17, 2011 6:21 AM PST

Because Microsoft Excel uses the same files and code under the hood.

Then again you could try Open Office which mimics Excel in other ways and is free.
Bob

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