| bw_tt_pi | R Documentation | 
The smoothing parameters are selected by the method of Wen and Wu (2015).
bw_tt_pi(udata, rho.add = TRUE)
bw_tt_cv(udata, rho.add = T)
| udata | data. | 
| rho.add | logical; whether a rotation (correlation) parameter shall be included. | 
Optimal smoothing parameters as in Wen and Wu (2015): a numeric
vector of length 4; entries are (h, \rho, \theta_1, \theta_2).
Kuangyu Wen
Wen, K. and Wu, X. (2018). Transformation-Kernel Estimation of Copula Densities Journal of Business & Economic Statistics, 38(1), 148–164.
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