# Notation

Term | Shorthand | Description |
---|---|---|

Data matrix | We will conventionally represent a data matrix by an upper-case For example, the data matrix And with data, we will conventionally use rows for each observation. Below is an example with a few rows of data, | |

Number of variables | This is the number of variables within the data set. If we are collecting data on the age, weight, and height of patients, then | |

Number of observations | This is the sample size, or the observation size, for our data set. | |

Observation (row of data) | A particular row of data We look at the | |

Variable (column of data) | A particular variable | |

Data point | This refers to the |