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Introduction to Contingency Tables definitions

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  • Contingency Table
    A matrix displaying frequencies for combinations of two categorical variables, with rows and columns representing categories.
  • Categorical Variable
    A data type with distinct groups or categories, such as grade level or car ownership status.
  • Frequency Table
    A chart listing counts for each category of a single variable, summarizing how often each occurs.
  • Cell Frequency
    The count found at the intersection of a specific row and column in a contingency table, representing a unique category combination.
  • Row Total
    The sum of all frequencies in a row, indicating the total count for a specific category across another variable.
  • Column Total
    The sum of all frequencies in a column, showing the total count for a specific category across another variable.
  • Grand Total
    The overall sum of all frequencies in a contingency table, representing the total number of observations.
  • Marginal Probability
    The likelihood of a single category occurring, calculated using row or column totals divided by the grand total.
  • Joint Probability
    The chance of two events happening together, found by dividing a cell frequency by the grand total.
  • Conditional Probability
    The probability of one event occurring given that another event has already occurred, using a cell frequency over a row or column total.
  • Category Total
    The total count for a specific group, found in the row or column totals of a contingency table.
  • Intersection
    The point in a contingency table where a specific row and column meet, representing a unique combination of categories.
  • Survey
    A method of collecting data from individuals, often used to gather information for contingency tables.
  • Event
    A specific outcome or category of interest in probability calculations, such as being a senior or driving a car.