*for the computation of the timevarying correlation
*for nonparametric smoothing
*for statistical tests on timevarying correlations

test_equality()
 Compute equality test between correlation coefficient estimates at two time points

test_ref()
 Test difference between correlation coefficient estimates and a value of reference
*for the computation of the confidence intervals
Data
A dataset to illustrate functionalities:

stockprice
 Daily Closing Prices of Major European Stock Indices, April 2000December 2017