Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Posted to microsoft.public.excel.misc
external usenet poster
 
Posts: 9
Default 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   Report Post  
Posted to microsoft.public.excel.misc
external usenet poster
 
Posts: 1,696
Default 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
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)

  #3   Report Post  
Posted to microsoft.public.excel.misc
external usenet poster
 
Posts: 9
Default 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)

Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
How do you graph a logistic growth curve? Skip Excel Discussion (Misc queries) 0 October 4th 06 12:55 AM
How can I plot data in different columns to same curve Sirritys Excel Discussion (Misc queries) 7 June 4th 06 11:46 AM
How can I plot data in different columns to same curve? Sirritys Charts and Charting in Excel 1 June 2nd 06 01:35 PM
How do I plot the derivative of a curve in Excel? Rients Excel Worksheet Functions 1 March 21st 06 11:36 PM
Plot the sin curve along the line y=x Rbp9ad Charts and Charting in Excel 3 December 21st 05 01:43 AM


All times are GMT +1. The time now is 08:13 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 ExcelBanter.
The comments are property of their posters.
 

About Us

"It's about Microsoft Excel"