How to create a trend line in cfchart?

I can create a scatter chart in cfchart - but I do not know how to create a linear regression trend line in the same chart as a second data series.
Kodemonki provided an answer in a forum discussion a few years ago (http://forums.adobe.com/message/192848#192848).
But I am not able to make it work (I have a dangerously small knowledge of coldfusion and statisitcal formulas).
Can someone tell me where i put in my to data query variables - such as for a query that gives results for two data fields, "Item1" and "Item2".
Thanks!
Here is Kodemonki's solution:


     <cfset min = 0>
     <cfset max = ceiling(arrayMax(grabData["value"])) + 1>
     <cfset n = grabData.recordCount>
     <cfset sum_x = 0>
     <cfset sum_x2 = 0>
     <cfset sum_xy = 0>
     <cfloop from="1" to="#grabData.RecordCount#" index="i">
          <cfset sum_x = sum_x + i>
          <cfset sum_xy = (i*grabData.value[i]) + sum_xy>
          <cfset sum_x2 = sum_x2 + (i*i)>
     </cfloop>
     <cfset sum_y = arraySum(grabData["value"])>
     <cfset slope = round(((n*sum_xy) - (sum_x*sum_y))/((n*sum_x2) - (sum_x*sum_x)))>
     <cfset intercept = round((sum_y - (slope*sum_x))/n)>
     <cfset best_fit = QueryNew("id, value")>
     <cfloop from="1" to="#grabdata.RecordCount#" index="i">
          <cfset queryAddRow(best_fit)>
          <cfset value = round((slope*i) + intercept)>
          <cfset QuerySetCell(best_fit, "id", grabData.xlabel[i])>
          <cfset QuerySetCell(best_fit, "value", value)>
     </cfloop>
     <cfchart scalefrom="#min#" scaleto="#max#" title="#GrabDatapointInfo.label#" format="jpg" chartHeight="450" chartwidth="500" xaxistitle="Month/Year">
          <cfchartseries type="line" query="best_fit" valuecolumn="value" itemcolumn="id"/>
          <cfchartseries type="line" query="grabData" valuecolumn="value" itemcolumn="xlabel"/>
     </cfchart>

Have you read the docs for CFCHART, CHCHARTSERIES, etc? Did you mess around with the example code sufficiently so you understand how the tags work?
http://help.adobe.com/en_US/ColdFusion/9.0/CFMLRef/WSc3ff6d0ea77859461172e0811cbec22c24-79 30.html
Adam

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CFChart does not do trend lines of any type. However, it is
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Logarithmic:
Not sure what you are asking here.
In theory, cfchart does do log-lin and log-log charts.
However, it is so buggy, and the scaling problems are so
great, that we have never been able to get it to work well.
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You cannot control these directly. Here are some workarounds:
For "Category" axis:
Make sure the "isBucketed" property is set to true (this is the
default).
If that is not enough, add extra bars to your data series,
usually value zero. It's not ideal but it may be good enough.
For "Scale" axis:
Usually this works well enough. Otherwise, try toggling the
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The only other recourse is to manually scale the plot using the
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How to create trend line in cfchart?

I can create a scatter chart in cfchart - but I do not know how to create a linear regression trend line in the same chart as a second data series. Kodemonki provided an answer in a forum discussion a few years ago (http://forums.adobe.com/message/192848#192848) - but I am not able to make it work (I have a dangerously small knowledge of coldfusion and statisitcal formulas). Can someone tell me where i put in my to data query variables - such as for a query that gives results for two data fields, "Item1" and "Item2".
Here is Kodemonki's solution:


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