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Cross Tabs
: Is a summary of information from 2 variables.
Sometimes they are called Contingency Tables.
Important Definitions:
Joint Distribution:
how the 2 variables are distributed together
Marginal Distribution:
how 1 variable is distributed without accounting for the other variable
Conditional Distribution:
how the 1 variable is distributed given a particular value of the other variable
Example:
Happy
Not
Happy
In class
2
48
At Home
40
10
What is the first thing you should do in a crosstab situation (if it is not already provided)?
Example of joint, marginal, and conditional:
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View Full DocumentSection 3.1
Sample Statistics

numerical measures of location, dispersion, shape, and association computed for
data FROM A SAMPLE
Population parameters
numerical measures of location, dispersion, shape, and association computed
for data FROM A POPULATION
Note: most of the time, we will just say statistic or parameter. Keep in mind statistics are always from
the sample and parameters are always from the population.
In addition, sometimes, statistics are referred to as
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 Spring '08
 MARTIN
 Variance

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