In this blog series, we will cover some basic definitions in statistics which are used to summarise numerical data. We will see them under four headings.
Measures of central tendency: These are measures which can be used to quantify or represent the most typical value or the centre of a data set. Below are the 3 commonly used measures of central tendency.
Mean
Median
Mode
Measures of dispersion: These measures indicate the variability or the spread of a dataset. Below listed are the commonly used measures of dispersion or spread
range
interquartile range
variance - population variance and a sample variance
Five-number summary for a numerical data set
minimum
maximum
first quartile
third quartile
second quartile or median
Some Adhoc Definitions
- outlier