Pharmacological applications of statistics are growing rapidly, as is the whole area of molecular biological statistics. Many times, good graphics are more informative than statistics. Adding a constant changes all but the geometric mean by the same constant. Range Percentiles Quartile, Quintile, Decile, etc. Sample Variance Standard Deviation Coefficient of variation Properties of variation measures Sample variance has units that are the square of the units of the observations.
Standard deviation has the same units as the observations.
Coefficient of variation has no units, and is helpful in understanding the magnitude of the variation without regard to the magnitudes of the observations. Adding a constant to the observations results in adding a constant to the sample variation and the standard deviation. Multiplying by a constant multiplies the sample variation by the square of the constant, but multiplies the standard deviation by the constant. Resources The Anscombe dataset in Excel format.