Fitting a curve similar to capacitor charging current.

Hi all,

Newbie to this forum, but need some excel help. I have collected a
bunch of data from an object as it heats up. The curve is very similar
to a capacitor charging current curve. In my case, manually trying to
approximate this curve, I come up with a formula of y=
(rise)*(1-exp(-time))+ambient. Is there a way in excel to fit a curve
like this or do I need an aftermarket solution? I need something that
will use the data points and perform calculations to determine the
curve.

Thanks,

Sean


--
mcgradys

Sean,

You can add a trendline to see what type of fit works best. When the chart is selected, used Chart
/ Add Trendline...
then choose from logarithmic, exponential, polynominal, power series, etc. When you have selected a
type of curve (depending on the quality of the fit), double click on the new trend line and then on
the Options tab of the dialog that opens, select "Display equation on chart" and "Display R-squared
value on Chart"

HTH,
Bernie
MS Excel MVP


"mcgradys" <[email protected]> wrote in message
news:[email protected]...
>
> Hi all,
>
> Newbie to this forum, but need some excel help. I have collected a
> bunch of data from an object as it heats up. The curve is very similar
> to a capacitor charging current curve. In my case, manually trying to
> approximate this curve, I come up with a formula of y=
> (rise)*(1-exp(-time))+ambient. Is there a way in excel to fit a curve
> like this or do I need an aftermarket solution? I need something that
> will use the data points and perform calculations to determine the
> curve.
>
> Thanks,
>
> Sean
>
>
> --
> mcgradys

You have several answers in the microsoft.public.excel.misc (General
Questions) newsgroup to your separate post of this same question. Separately
posting the same question in multiple newsgroups is generally frowned upon.

Jerry

"mcgradys" wrote:

>
> Hi all,
>
> Newbie to this forum, but need some excel help. I have collected a
> bunch of data from an object as it heats up. The curve is very similar
> to a capacitor charging current curve. In my case, manually trying to
> approximate this curve, I come up with a formula of y=
> (rise)*(1-exp(-time))+ambient. Is there a way in excel to fit a curve
> like this or do I need an aftermarket solution? I need something that
> will use the data points and perform calculations to determine the
> curve.
>
> Thanks,
>
> Sean
>
>
> --
> mcgradys
>

Sorry, I looked and saw different websites, and thought they were similar but different forums. Won't happen again.

Sean