Most succinctly put, standard deviation is about where the data are clustered in one sample data, while SEM is where the means would be clustered around many samples taken of a given set of things.

Homogeneity of variance is the assumption that your data sets are equal in variance. It allows for the validation of ...

You can test this assumption in PROC GLM by using the HOVTEST option in the MEANS statement, requesting a homogeneity of variance test. This section discusses the computational details behind these ...

A research team from the Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of Sciences has ...

So for each sample-like component ... we begin by looking at the proportion of the variance present in all genes contained within each principal component (Fig. 1d). Note that although the ...