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Lecture 2

# STAT 101 Lecture Notes - Lecture 2: Contingency Table, Dependent And Independent Variables

Department
Statistics
Course Code
STAT 101
Professor
haleyjeppson
Lecture
2

Page:
of 4
2.1\$ Summarizing\$ and\$ Displaying\$ a\$Single\$ Categorical\$ Variable
Frequency\$ table-contains\$ categories\$ and\$ your\$ values
Relative\$ frequency\$ table-displays\$ the\$ percentages\$ of\$ the\$ categories
Frequency) Tables
Bar) Charts)
Pie) Chart
Chapter(Two
Saturda y,\$ Septem be r\$ 3,\$ 2016
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Response\$ variable-variable\$ of\$interest\$ (rows)
Explanatory\$ variable-explains\$ the\$ differences\$ in\$ the\$ response\$ variable\$
(columns)
Contingency\$ table-compares\$ various\$ variables
Marginal\$ distributions-looks\$ at\$ percentages\$ for\$ each\$ variable\$ separately,\$
take\$ the\$ total\$ of\$ each\$ subcategory\$ divided\$ by\$ the\$ grand\$ total
Conditional\$ distributions-looks\$ at\$ percentages\$ for\$ one\$ variable\$
conditioned\$ on\$ a\$particular\$ category,\$ take\$ the\$ totals\$ of\$ the\$ specific\$
category\$ divided\$ by\$ just\$ the\$ total\$ in\$that\$ row\$
The) Relationship) Between) Two) Categorical) Variables
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category\$ divided\$ by\$ just\$ the\$ total\$ in\$that\$ row\$
Rows\$ are\$ categories\$ of\$ response\$ variable\$ while\$ columns\$ are\$ the\$
categories\$ of\$ the\$ explanatory\$ varible\$
Mosaic\$ plot-graphical\$ summary\$ of\$ conditional\$ distributions\$ in\$
contingency\$ table
Association=\$ lines\$ of\$ plot\$ do\$not\$line\$ up,\$ conditional\$ distributions\$ are\$
different
No\$association=\$ lines\$ in\$plot\$match\$ up,\$conditional\$ distributions\$ are\$ the\$
same
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