function that generates a comparison plot among several packages
comparison.Plt(
pckgDwnlds.lst,
t0,
t1,
cmb = TRUE,
noMAvgs = FALSE,
noCBs = FALSE,
device = "PDF",
dirSave = NULL
)nested list containing the several packages to process
initial date
final date
boolean flag, indicating whether the plots are shown in the same (default) graph or not
boolean flag, indicating whether moving averages are displayed (default) or NOT --set to TRUE--
boolean flag, indicating whether shaded confidence intervals are displayed (default) or NOT --set to TRUE--
string to select the output format: 'PDF'/'PNG'/'JPEG' or 'screen'
specify a valid directory where to save the file