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 how do i plot a logistic curve?
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## how do i plot a logistic curve?

#1
March 8th 08, 06:40 PM posted to microsoft.public.excel.misc
 Trussman external usenet poster Posts: 9
how do i plot a logistic curve?

I am trying to plot a logistic curve and determine r2 values for 13 data points
(0,38558),(10,49371),(20,62980),(30,76212),(40,922 28),(50,106022),(60,123203),(70,132165),(80,151326 ),(90,179323),(100,203212),(110,226546),(120,24871 0),(130,281422)
#2
March 8th 08, 06:59 PM posted to microsoft.public.excel.misc
 Sean Timmons external usenet poster Posts: 1,696
how do i plot a logistic curve?

Not sure if you just want one value, but if so, there's a formula, LOGEST
that will return statistics for the curve. In your example, it returns
1.014717061. If that's what you wanted, put your X in, say, column A and your
Y in clumn B.

=LOGEST(B1:B100,A1:A100,TRUE,FALSE)

where the first TRUE indicates the constant is calculated normally or FALSE
if equal to 1.

and second FALSE indicates return m-coeffs and the constant b or TRUE
OR, if you want a chart, highlight your Xs and Y's, select line as the chart
type. Ensure you set your values as needed, then right click on the resulting

Otherwise, I have no idea what you need because I never took advanced stats.
:-)

"TRUSSMAN" wrote:

> I am trying to plot a logistic curve and determine r2 values for 13 data points
> (0,38558),(10,49371),(20,62980),(30,76212),(40,922 28),(50,106022),(60,123203),(70,132165),(80,151326 ),(90,179323),(100,203212),(110,226546),(120,24871 0),(130,281422)

#3
March 9th 08, 03:57 AM posted to microsoft.public.excel.misc
 Trussman external usenet poster Posts: 9
how do i plot a logistic curve?

Thank you for your reply. I am trying to find a way to fit a logistic curve
to the scattergraph I have, and finding each value seems a little too work
intensive, do you have any other suggestions?

"Sean Timmons" wrote:

> Not sure if you just want one value, but if so, there's a formula, LOGEST
> that will return statistics for the curve. In your example, it returns
> 1.014717061. If that's what you wanted, put your X in, say, column A and your
> Y in clumn B.
>
> =LOGEST(B1:B100,A1:A100,TRUE,FALSE)
>
> where the first TRUE indicates the constant is calculated normally or FALSE
> if equal to 1.
>
> and second FALSE indicates return m-coeffs and the constant b or TRUE
> indicates return additional regression stats.
> OR, if you want a chart, highlight your Xs and Y's, select line as the chart
> type. Ensure you set your values as needed, then right click on the resulting
> graph line and click Add trendline. Pick your trend line type.
>
> Otherwise, I have no idea what you need because I never took advanced stats.
> :-)
>
> "TRUSSMAN" wrote:
>
> > I am trying to plot a logistic curve and determine r2 values for 13 data points
> > (0,38558),(10,49371),(20,62980),(30,76212),(40,922 28),(50,106022),(60,123203),(70,132165),(80,151326 ),(90,179323),(100,203212),(110,226546),(120,24871 0),(130,281422)

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