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standard deviation
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RMSE vs standard deviation: what does comparing them tell you?
Why the standard deviation of the outcome is the RMSE of a model that always predicts the mean, and how the ratio of the two gives R-squared.
Read the answer →Standard error vs standard deviation: what is the difference?
The SD describes how individual values vary; the standard error describes how a sample mean varies. How to tell which one you need, totals included.
Read the answer →What are degrees of freedom in statistics, really?
Degrees of freedom count how much of your data is left for estimating variability once other quantities are estimated. The idea in plain language.
Read the answer →Why does standard deviation square the differences?
Squaring deviations makes variances add up, ties into least squares and the normal distribution, and keeps the math clean.
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