Description Usage Arguments Value Examples

Simulates a time series of continuous exposure values with or without a seasonal and / or long-term trend.

1 2 3 | ```
continuous_exposure(n, mu, sd = 1, trend = "no trend", slope, amp = 0.6,
cust_expdraw = NULL, cust_expdraw_args = list(),
start.date = "2000-01-01", ...)
``` |

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

`mu` |
A numeric value giving the mean exposure across all study days. |

`sd` |
A numeric value giving the standard deviation of the exposure values from the exposure trend line. |

`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. |

`cust_expdraw` |
A character string specifying a user-created function which determines the distribution of random noise off of the trend line. This function must have inputs "n" and "mean" and output a vector of simulated exposure values. |

`cust_expdraw_args` |
A list of arguments other than "n" and "mean" required by the cust_expdraw function. |

`start.date` |
A date of the format "yyyy-mm-dd" from which to begin simulating daily exposures |

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

A data frame with the dates and simulated daily exposure values from `n`

days.

1 2 3 | ```
continuous_exposure(n = 5, mu = 100, sd = 10, trend = "cos1")
continuous_exposure(n=10, mu=3, trend="linear", slope = 2,
cust_expdraw=rnorm, cust_expdraw_args = list(sd=.5))
``` |

eesim documentation built on June 4, 2017, 1:03 a.m.

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