Types of Measure

Central Tendency tells you about the centers of the data. Useful measures include the mean (Weighted Mean, Harmonic Mean, Geometrical Mean), median, and mode (Mode, Multimode). 
Harmonic Mean is the reciprocal of the arithmetic mean of the reciprocals.
n∑in(1xi)\frac{n}{\sum_i^n(\frac{1}{x{i}})}∑in​(xi1​)n​
 ,  where i=1,2,...ni=1,2,...ni=1,2,...n
 and nnn
 is the number of items in the dataset xxx
 . 
Geometric Mean is the n-th root of the product of all nnn
 elements xix_ixi​
 in a dataset xxx
.
∏inxin\sqrt[n]{\prod_i^n x_{i}}n∏in​xi​​
 , where i=1,2,...ni=1,2,...ni=1,2,...n
 and nnn
 is the number of items in the dataset xxx
 .
Variability tells you about the spread of the data. Useful measures include variance, Standard deviation, Skewness, Percentile, and Range.
Correlation or Joint Variability tells you about the relation between a pair of variables in a dataset. Useful measures include covariance and the correlation coefficient.
Last modified 3yr ago