Estimate the unrestricted covariance matrix using the...

Given a particular cutoff (`x`

), what is the mean of the new truncated normal?

1 | ```
normalMean(cutoff, mean = 0, sd = 1)
``` |

`cutoff` |
The cutoff value for the truncated normal |

`mean` |
The mean of the non-truncated distribution (defaults to zero) |

`sd` |
The sd of the non-truncated distribution (defaults to 1) |

The mean of a pdf (f(x)) is computed by integrating the function x*f(x) from -Inf to Inf. To compute
a truncated normal, the function remains the same, but the limits change (from -Inf to `cutoff`

).

the mean of the tuncated normal distribution

Dustin Fife

1 2 3 4 5 | ```
### compute mean of a distribution cutoff at mean
normalMean(0, 0, 1)
### compare to simulated data
x = rnorm(1000000, 0, 1)
mean(x[x>0])
``` |

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