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March 25th, 2008, 03:46 PM  #1 
Newbie Joined: Mar 2008 Posts: 1 Thanks: 0  Root Sum Squared(RSS) or Root Mean Squared(RMS).when to use?
Hello, I have looked everywhere and I can't find a clear explanation (in plain language) of when to use RSS or RMS... can someone please explain. I am trying to apply this to a design with numerous parts in a manufacturing environment. Assuming all tolerances have normal variation. Which do I use 
March 27th, 2008, 02:53 AM  #2 
Member Joined: Sep 2007 Posts: 30 Thanks: 0  Rss for standard deviation, RMS closer to mean
I know in manufacturing processes RSS is used to combine errors of independent events. For example if 3 processes each add +/2% error to a product parameter then the expected total error after the 3 processes is the RSS sum of 2% or 3.46%. I am not sure in a manufacturing process where RMS is used. It typically is used to average values that have a mean of zero if not squared. For example a voltage with a sine wave characteristic would use RMS of the sine wave to calculated average power. 

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