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Bookmark or Share- Finding mean when class sizes are unequal - Cross ValidatedMean number of absent days per student: (Total number of absent days) / ( Number of students) = 487 / 40 = 12.175 Hence the mean number of absent days per student is approximately 12. But as Henry pointed out: Your groups are overlapping, that is: It is not clear to which group a student belongs, who has 6 absent day or 10 absent days.
- What is the difference between "mean value" and "average"?The mean you described (the arithmetic mean) is what people typically intend when they say "mean" and, yes, that is the same as average. The only ambiguity that can occur is when someone is using a different type of mean, such as the geometric mean or the harmonic mean, but I think it is implicit from your question that you were talking about ...
- How to read scientific notation output (numbers that include "e")?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 ...
- What's the difference between "mean independent" and independent?Mean independence is less restrictive as it is a one number summary of the values of u, for each level of x. To be more exact, mean independence between u and x would mean that for each value of x, a one number summary of the values of u, the average weighted by the conditional density function of u given x, is constant.
- What does LS (least square) means refer to? - Cross ValidatedObviously, I know what "mean" refers to and I know when one estimates a mean for a population from a sample, one has to put some measure of confidence to it, or a measure of standard error, otherwise it's just a number - this does not seem to be the case with LS-means measure (at least not in the papers I encountered, maybe they just did a ...
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