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#1
Posted to microsoft.public.excel.charting




Sigmoid Curve
Hi,
Apologies if my question appears basic or I don't include relevant info! I've been asked to plot a sigmoid curve to plot the sales cycle of a product. I don't know if a sigmoid curve is alway a certain shape (like the product life cycle ) or if it depends on the data I enter? Either way, how would I go about plotting one in Excel 2003? I then need to plot several points along this curve  is this also doable? Thanks in advance, Claire 
#2




Answer: Sigmoid Curve
Hi Claire,
No need to apologize, happy to help! A sigmoid curve is a mathematical curve that has an "S" shape, and it is commonly used to model growth or decline over time. In the case of a sales cycle, it can represent the initial slow growth, followed by a period of rapid growth, and then a plateau as sales level off. To plot a sigmoid curve in Excel 2003, you can follow these steps:
To plot several points along the curve, you can add additional data points to your original data and include them in the chart. You can also use the "Trendline" feature in Excel to add a line that follows the curve and displays the equation for the curve. To do this, rightclick on the curve and select "Add Trendline". In the "Format Trendline" window, select the "Display Equation on chart" option. Formula:
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#3
Posted to microsoft.public.excel.charting




Sigmoid Curve
This will tell you what a sigmoid curve is:
http://en.wikipedia.org/wiki/Sigmoid_function If you already have the data and you plot Sales against dates then you may or may not get a sigmoid curve. Generally this would mean sales were slow at first, then took off but later slowed down. If you want to just make up data so that when plotted it looks sigmoidal, please send message to my private email address. best wishes  Bernard V Liengme Microsoft Excel MVP www.stfx.ca/people/bliengme remove caps from email "Claire C" wrote in message ... Hi, Apologies if my question appears basic or I don't include relevant info! I've been asked to plot a sigmoid curve to plot the sales cycle of a product. I don't know if a sigmoid curve is alway a certain shape (like the product life cycle ) or if it depends on the data I enter? Either way, how would I go about plotting one in Excel 2003? I then need to plot several points along this curve  is this also doable? Thanks in advance, Claire 
#4
Posted to microsoft.public.excel.charting




Sigmoid Curve
Hi Bernard,
I need to smooth the curve I created with Excel and can't find the right function to do it in the 2007 MS Excel version. Basically my data resembles an S shape and want to make it sigmoideal. I found this old post and wonder if you could help me. Thanks! Adriana PS: I do not have your private email address. On Wednesday, September 12, 2007 10:00 AM Claire wrote: Hi, Apologies if my question appears basic or I don't include relevant info! I've been asked to plot a sigmoid curve to plot the sales cycle of a product. I don't know if a sigmoid curve is alway a certain shape (like the product life cycle ) or if it depends on the data I enter? Either way, how would I go about plotting one in Excel 2003? I then need to plot several points along this curve  is this also doable? Thanks in advance, Claire On Wednesday, September 12, 2007 12:51 PM Bernard Liengme wrote: This will tell you what a sigmoid curve is: http://en.wikipedia.org/wiki/Sigmoid_function If you already have the data and you plot Sales against dates then you may or may not get a sigmoid curve. Generally this would mean sales were slow at first, then took off but later slowed down. If you want to just make up data so that when plotted it looks sigmoidal, please send message to my private email address. best wishes  Bernard V Liengme Microsoft Excel MVP www.stfx.ca/people/bliengme remove caps from email "Claire C" wrote in message ... 
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