Study design

Contingency analysis study requirements and dataset layout.

Requirements

  • 2 categorical variables.

or:

  • A qualitative response variable.
  • A categorical factor variable with 2 or more levels.

or:

  • 2 or more repeated measurements on a qualitative response variable.

Dataset layout

Use a column for each variable (Eye color, Hair color); each row has the values of the variables.

Subject (optional) Eye color Hair color
1 Brown Black
2 Blue Red
3 Blue Blonde
4 Brown Red
5 Green Blonde
6 Hazel Brown
7 Blue Blonde
8 Brown Black
9 Green Red
10 Green Blonde

Frequency form dataset layout

Use a column for each variable (Eye color, Hair color) and a column for the number of cases (Frequency); each row has the values of the variables and the frequency count.

Eye color Hair color Frequency
Brown Black 69
Brown Brown 119
Brown Red 26
Brown Blonde 7
Blue Black 20
Blue Brown 84
Blue Red 17
Blue Blonde 94
Hazel Black 15
Hazel Brown 54
Hazel Red 14
Hazel Blonde 10
Green Black 5
Green Brown 29
Green Red 14
Green Blonde 16