Description Usage Arguments Value

Internal function. Calculates the crude one-sided difference quotients and the second-order difference quotients based on the height data and the observed time points.

1 |

`data` |
As in |

`tobs` |
As in |

`YI` |
An N times (n-1) matrix with rows given by the values of the one-sided difference quotients |

`Xtilda` |
An n by N matrix with columns given by the values of the second-order difference quotients |

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