# Stats terminology

rename
immysheep's
version from
2017-06-17 13:43

## Section

Question | Answer |
---|---|

Quartiles | The three points that divide the data in ascending order into 4 equal groups which comprises a quater of the data. A quartile is a type of quantile. |

Quantile | Given an ECDF p=Fn(x), the quartile is defined as its inverse, Fn-1(x) |

Percentile | Is a quantile of a particular percent point, Fn-1(p), 0 < p < 100 |

Individual space | The space consists of elements (points) each of which corresponds to each record (row vector) of relational data. |

Variate space | The space consists of elements (points) each of which corresponds to each variate (Column vector) of relational data. |

Orthogonal | When the angle between two vectors, xi and xj, is 90 degrees. Thus the inner product = 0. |

Levels | The elements of the domain of factor variables. |

The factor variable | Is a variable whose data class is character. |

The signal noise ratio | Given a linear model, y=Xb + e, the SN ratio is defined as the ratio of squared norms llXbll^2 / llell^2 |

Degree of freedom | The dimension of the variate space to which the data vector belongs in the linear context. |

The random variable | A variable which has not got an actual number yet, but will have one which is governed by a probability distribution. |

The p-value | The p-value is the upper (and/or lower) probability of a test statistic of interest under the null hypothesis. |

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