A distogram is an extension of the variogram to a multivariate time-series. It computes, for each observation (with a constant interval h between each observation), the euclidean distance normated to one (chord distance)
disto(x, max.dist=nrow(x)/4, plotit=TRUE, disto.data=NULL)A data frame containing distance and distogram values
a matrix, a data frame or a multiple time-series
the maximum distance to calculate. By default, it is the third of the number of observations (that is, the number of rows in the matrix)
If plotit=TRUE then the graph of the distogram is plotted
data coming from a previous call to disto(). Call the function again with these data to plot the corresponding graph
Frédéric Ibanez (ibanez@obs-vlfr.fr), Philippe Grosjean (phgrosjean@sciviews.org)
Dauvin, J.C. & F. Ibanez, 1986. Variations à long-terme (1977-1985) du peuplement des sables fins de la Pierre Noire (baie de Morlaix, Manche Occidentale): analyse statistique de l'évolution structurale. Hydrobiologia, 142:171-186.
Ibanez, F. & J.C. Dauvin, 1988. Long-term changes (1977-1987) in a muddy fine sand Abra alba - Melinna palmate community from the Western English Channel: multivariate time-series analysis. Mar. Ecol. Prog. Ser., 49:65-81.
Mackas, D.L., 1984. Spatial autocorrelation of plankton community composition in a continental shelf ecosystem. Limnol. Ecol., 20:451-471.
vario