Description Usage Arguments Value Examples

Creates a trend vector for a continuous exposure.

1 2 |

`n` |
A non-negative integer specifying the number of days to simulate. |

`trend` |
A character string that specifies the desired trend function. Options are: "no trend": No trend, either seasonal or long-term (default). "cos1": A seasonal trend only. "cos2": A seasonal trend with variable amplitude across years. "cos3": A seasonal trend with steadily decreasing amplitude over time. "linear": A linear long-term trend with no seasonal trend. "curvilinear": A curved long-term trend with no seasonal trend. "cos1linear": A seasonal trend plus a linear long-term trend.
See the package vignette for examples of the shapes of these trends. |

`slope` |
A numeric value specifying the slope of the trend, to be used
with |

`amp` |
A numeric value specifying the amplitude of the seasonal trend. Must be between -1 and 1. |

`custom_func` |
An R object specifying a customized function from
which to create a trend variable. Must accept the arguments |

`...` |
Optional arguments to a custom trend function |

A numeric vector of simulated exposure values for each study day, to be used to generate data with seasonal trends.

1 | ```
calc_t(5, "cos3", amp = .5)
``` |

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