#### How can i extrapolate and find/show values on a calibration curve

```Im am writing the scientific report where I have a calibration curve. I want
to use that and find the concentration of an unknown sample. This is easily
done by hand, but how do i show it on exel and on the chart itself?
```
 0
Heekla (1)
12/9/2008 5:55:03 PM
excel.charting 18370 articles. 0 followers.

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```I will assume that the calibration curve is linear (y = mx + b)
In some cell (say D1) we can find the slope (m) with the formula
=SLOPE(y-values, x-values)
Something like =SLOPE(B2:B12, A2:A12)
Likewise in say D2 we can find intercept (b) with =INTERCEPT(y-values,
x-values)

Let D3 contain the measured y-value from which you need to compute its
x-value
Let these values be Y and X
So Y =mX + b or X = (Y-b)/m
Turning this into Excel: in cell D4 enter =(D3-D2)/D1

Now having done that, you need to be able to report also your confidence
intervals
See
http://people.stfx.ca/bliengme/ExcelTips/RegressionAnalysisConfidence3.htm

By the way: I hope you are INTERPOLATING for the calibration curve not
EXTRAPOLATING
The former is generally valid, while the later is fraught with dangers

best wishes
--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
remove caps from email

"Heekla" <Heekla@discussions.microsoft.com> wrote in message
news:23EC374A-54F4-4215-B52E-FB328DE5C4E5@microsoft.com...
> Im am writing the scientific report where I have a calibration curve. I
> want
> to use that and find the concentration of an unknown sample. This is
> easily
> done by hand, but how do i show it on exel and on the chart itself?

```
 0
bliengme5824 (3040)
12/9/2008 6:39:27 PM

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