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micro micro
wrote...
Posts: 170
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10 years ago
I'm plotting a graph with one of the axis being concentration which has a range of 160 - 0.04 ppm and 0 ppm. How would you normalize the axis/data since log cannot be used (since I'm considering 0 concentration as well)?
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wrote...
#1
Staff Member
Educator
10 years ago
Quote from: micro (10 years ago)
160 - 0.04 ppm and 0 ppm

The range is from 0 to 160 ppm? Not following this correctly, I don't think.
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micro Author
wrote...
#2
10 years ago
Correct 160 ppm to 0 ppm. But the concentration intervals are a factor 2 e.g.:
160
80
40
20
10
5
2.5
1.25 etc...

This could be infinite on going down to zero thats why I mentioned 0.04 ppm as the last one. The problem is that to 0.04 ppm, the small concentrations are 'lost' in a graph since the limit of the upper range is 160...a much larger number.
wrote...
#3
Staff Member
Educator
10 years ago
So, it's going down exponentially. SQRT(x) or x^(1/2)

I think your question is more so a software issue, right? You can't seem to plot it accurately due to space constraints. In this case, you can't use log. Hmm, what are you using for your software?
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micro Author
wrote...
#4
10 years ago
I want to normalize the data so I can plot them. At the moment since 160 is so far from the lower values, the lower values appear overlapped in order to accomodate the higher values. Its irrelevant which software is used (I'm using excel) because the same principles apply. Because I am considering 0 concentration, I cannot use log to normalize it.
wrote...
#5
Staff Member
Educator
10 years ago
Data goes from 160 down to <1 ?
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micro Author
wrote...
#6
10 years ago
Yep and then 0.
wrote...
#7
Staff Member
Educator
10 years ago
Quote from: micro (10 years ago)
Yep and then 0.

That's not good. How do you know it's exponential decrease then? Do your values from 1 to 0 decrease exponentially? Perhaps you may need to remove 160 then.
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