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Which mean to use and when? - Cross Validated So we have arithmetic mean (AM), geometric mean (GM) and harmonic mean (HM) Their mathematical formulation is also well known along with their associated stereotypical examples (e g , Harmonic mea
How to read scientific notation output (numbers that include e)? What does the notation like 8 6e-28 mean? What is the 'e' for? (2 answers) Closed 7 years ago After running the lm regression model using R, sometime one is bound to get very small P values or values in the covariance matrix Something of the sort: -1 861246e-04 for example in a covariance matrix
mean - Averaging variances - Cross Validated Context is everything here Are these theoretical variances (moments of distributions), or sample variances? If they are sample variances, what is the relation between the samples? Do they come from the same population? If yes, do you have available the size of each sample? If the samples do not come from the same population, how do you justify averaging over the variances?