Fundamentals of Statistics contains material of various lectures and courses of H. Lohninger on statistics, data analysis and chemometrics......click here for more. 
Home Univariate Data Measures of Location Mean Quadratic Mean  
Quadratic MeanThe quadratic mean is referred to as root mean square (RMS) in electrical engineering and is used to calculate the effective value of and alternating current or voltage: Due to the averaging of the squares of the observations x_{i} the quadratic mean may not become negative and must not be seen as a "mean" at all  the quadratic mean is in fact a measure of the energy content of a signal. 

Home Univariate Data Measures of Location Mean Quadratic Mean 