It plots the univariate or bivariate. This function is not intended for users but to be called by trend_estimate.
graph_trend(dat, N, tau, dvar, label = NULL, jump = 1:N,
bands = TRUE, las, bivariate = TRUE)is a 2x2 covariace matrix
the number of observations
the smoothed time series
the estimated variance for tau
the vectors of caracters associated to the time points to appear in the axis
if label is too long, jump thin them on the axis
is TRUE to draw the approximately 95% confidence bands around tau
is 1 and 2 if the asis should appear vertical and horizontal, respectively
is FALSE if dat is a univariate time series
The empirical correlation fo the two series