Summary Descriptive statistics: Numerical Measures (STK110)

Descriptive Statistics: Numerical Measures
Chapter 3
 Sample variance:
Measures of Location
Mean: average value.
 Sample:
 Population:



Median: middle w/e arranged
ascending order.
Mode: occurs most.
Geometric Mean: measure of location
calc by finding nth root of product of
n value.
 Analysing growth rate in financial
Standard Deviation: defined 2 b
data.
positive square root of variance.
“s” for sample
Percentiles: prov info abt data spread
over interval from smallest 2 largest.
Coefficient of Variation: measures
std deviation relative 2 mean.
Ect.


Measure of Distribution,
Shape, Relative Location
Measures of Variability and Outliers
Skewness:
Range:

Interquartile Range:

Variance: diff btw value of each
observation (xi) & mean.
 Deviation about mean
 For sample
 For population
 Variance = deviations around mean
squared.
 Population variance: