Data types |
Data subtypes |
Examples |
Statistically manipulable? |

Continuous | Interval | Date | Yes - parametric tests (e.g., t-test, ANOVA) |

Ratio | Age | Yes - parametric tests | |

Ordinal | Size place | Yes - nonparametric tests (e.g., Chi-squared) | |

Nominal | Coded (numbers or words) | Gender code | Yes - nonparametric tests |

Descriptive (uncoded numbers or words) | Notes, IDs | No | |

Note: parametric tests may be used only when the sample data follow a Gaussian distribution |