Collection of miscellaneous useful and semi-useful functions

Fast computation of simple regression slopes for each predictor represented by a column in a matrix

1 | ```
mfastLm_cpp(y, x, addintercept)
``` |

`y` |
A vector of outcomes. |

`x` |
A matrix of regressor variables. Must have the same number of rows as the length of y. |

`addintercept` |
A logical that determines if the intercept should be included in all analyses (TRUE) or not (FALSE) |

A data frame with two variables: coefficients and stderr that gives the slope estimate and corresponding standard error for each column in x.

Claus Ekstrom <claus@rprimer.dk>

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