KirkLindstrom.com - Articles - 2012  - ECRI:  How to Calculate WLI Growth from ECRI's Weekly WLI Data Series
Kirk Windsurfing at Palo Alto in SF Bay in May 2009  How to Calculate WLI Growth Rate
  Formula for ECRI's WLI Growth Rate
Kirk Windsurfing at Coyote Point November 2009
 
Chart of Average Annual CPI Inflation Rate
 
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December 1, 2012:  ECRI's weekly Excel spreadsheet , published here, includes the U.S. WLI (Weekly Leading Index) and  WLI Growth Rate series.  WCRI's WLI growth is a series of raw numbers in the spreadsheet without the underlying calculations.  The exact formula to calculate ECRI's WLI growth rate comes from a 1999 article1 published by Anirvan Banerji, the Chief Research Officer at ECRI.                        Article: Beware of Annuities
 
 
Here is the formula:  
WLIg = [m*(MA1/MA2)^n] – m

"MA1" = 4 week moving average of the WLI
"MA2" = moving average of MA1 over the preceding 52 weeks
"n"= 52/26.5
"m"= 100

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Here is my most recent chart of WLI and WLI growth published in my Seeking Alpha article, "ECRI Says Recession Began In July, Rising SPY Could Point To A Recovery Ahead"
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note 1.  Source:  The formula comes from an article published in 1999 by Anirvan Banerji, the Chief Research Officer at ECRI, titled "The three Ps: simple tools for monitoring economic cycles - pronounced, pervasive and persistent economic indicators."

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