  In this article, I introduce the sivqr command, which estimates the
coefficients of the instrumental variables (IV) quantile regression model
introduced by Chernozhukov and Hansen (2005). The sivqr command offers several
advantages over the existing ivqreg and ivqreg2 commands for estimating this IV
quantile regression model, which complements the alternative "triangular model"
behind cqiv and the "local quantile treatment effect" model of ivqte.
Computationally, sivqr implements the smoothed estimator of Kaplan and Sun
(2017), who show that smoothing improves both computation time and statistical
accuracy. Standard errors are computed analytically or by Bayesian bootstrap;
for non-iid sampling, sivqr is compatible with bootstrap. I discuss syntax and
the underlying methodology, and I compare sivqr with other commands in an
example.
