This paper extends the linear lasso estimators to non-linear case. We are especially interested in GMM type of Lasso estimators. Lasso estimators are generalization of ridge regression in least squares. With this setup we can deal with identification problem introduced by weak instruments. When...

It is common in applied econometrics to test a highly persistent process under the null hypothesis against an alternative of a unit root process. We show that the conventional asymptotic critical values for the stationarity tests of Kwiatkowski et al. and Leybourne and McCabe may have...

We propose a pretest, bootstrap Kolmogorov-Smirnov test, to differentiate between weak and nearly-weak asymptotics. This is based on bootstrapping Wald Continuous Updating Estimator (CUE) based test. Since Wald CUE test has different limits under weak and nearly-weak cases this can be used in a...