forecast_starting: Forecast starting at given time
In Mamie/PILAF: PILAF: Phylodynamics InfLuenzA Forecast

Forecast starting at given time

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forecast_starting(tree, last_time, week_start, year_start, formula, label,
  pred = 4, pref = TRUE, n = 1, include_trunc = T,
  thresh = 0.019)

`tree`	A phylo object
`last_time`	The last sampling time in the tree
`week_start`	The week of first forecast timepoint
`year_start`	The year of first forecast timepoint
`formula`	The formula for BNPR forecast
`label`	A character string as label for the time series
`pred`	The number of weeks to forecast
`pref`	Whether using preferential sampling
`n`	The number of samples near the truncation time
`include_trunc`	Whether to include the truncation timepoint
`thresh`	Maximum distance from truncation time of the n samples