Changes in version 0.1-8 - the package vignette can be found in https://mstasinopoulos.github.io/Functions-from-packages/. Changes in version 0.1-5 - the functions data_part(), data_part_list(), data_Kfold(), data_boot_index() and data_boot_weights() are added. Changes in version 0.1-4 - Function data_leverage() added. Changes in version 0.1-3 - Functions data_str() and data_exclude_class() are modified to work with POSIXct class. - Functions data_dim() and data_omit() are separated. - Function data_cut() added. This function insures that for very large data sets the plotting function like data_plot() and data_xyplot() only use a random part of the data so they are are working fast. - Functions void() and data_void() added. - Function data_part_list() added. - Function data_rename() added. Changes in version 0.1-2 - Partial correlation functiom data_pcor() added. - Replacement of the use of class()== with inherits(). - Bug fix in the function data_re1val() when the variable was a factor.