Auxiliary Functions for Phenological Data Analysis
Connected sets in a matrix
Converts string date to Julian date
Converts a date (day,month,year) to Julian date
Daylength at julian day i on latitude l
Number of days between two dates
Phenological observations
Finds connected sets in a matrix or data frame
Converts Julian date into string date
Converts Julian date to integers day,month,year
Boolean test for leap year
Converts numeric matrix to data frame
Maximal connected set in a matrix
Maximal day length on latitude l
Dense design matrix for phenological data
Fits a two-way linear fixed model
Fits a robust two-way linear model
Fits a two-way linear mixed model
Converts a numeric data frame to matrix
Sequential Mann-Kendall test for time series.
Kendall's normalized tau
Provides some easy-to-use functions for time series analyses of (plant-) phenological data sets. These functions mainly deal with the estimation of combined phenological time series and are usually wrappers for functions that are already implemented in other R packages adapted to the special structure of phenological data and the needs of phenologists. Some date conversion functions to handle Julian dates are also provided.