# Basic Statistical Symbols[*]

C

A distribution, also called the distribution for the independent variable

U

A distribution that is that the not same as X, also called the dependent variable

SC

Sum all the elements [numbers] in the distribution

SC2

Square all the elements [numbers] then add them to each other

(SC)2

Add all the elements then square the summation

N

The number of elements in a population distribution

n

The number of elements in a sample distribution

X1

The first element [number] in a distribution

X2

The second element [number] in a distribution

Xn

The last element in a distribution

All the elements between two points in a distribution

SCY

Multiply X1 by Y1, X2 by Y2, , Xn by Ynand sum the distribution

a

Greek letter for alpha: the intercept or a type I error

b

Greek letter for beta: the slope or a type II error

s

Greek letter for sigma, meaning the standard deviation for the population

s

Letter s, meaning the standard deviation for the sample

s2

Letter s square, meaing the variance for the sample
s1 In a time series, the first data point; subscripts note the location of the data point
sn – 1 In a time series, the second to the last data point.
sn  In a time series, the last data point.

m

Greek letter mu, meaning the [arithmetic] mean of the population

Also call "X-bar" meaning the [arithmetic] mean of the sample

Md

Median

Mo

Mode

Gm

Geometric mean

Hm

Harmonic mean

[*] Population vs Sample

The population includes all objects of interest whereas the sample is only a portion of the population. Parameters are associated with populations and statistics with samples. Parameters are usually denoted using Greek letters while statistics are usually denoted using Roman letters.