PO218 Lecture 2: DESCRIPTIVE MEASURES

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28 Jan 2019

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DESCRIPTIVE MEASURES

Descriptives

• Describes the data

1) Central Tendency

o The most typical observation (most likely)

o 3 Primary measures of central tendency

▪ Continuous:

• Mean/average

** Cannot be used for nominal/ordinal variables

• Median/middle

• Mode/Most frequently occurring observation

→

Proportions

2) Dispersion

o Measures consistency

▪ Continuous

• Variance and Standard Deviation

• Low number = not much variation

• High number = lots of variation

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