From the Help Desk: Local Polynomial Regression and Stata Plugins

From the help desk: Bootstrapped standard errors

Bootstrapping is a nonparametric approach for evaluating the distribution of a statistic based on random resampling. This article illustrates the bootstrap as an alternative method for estimating the standard errors when the theoretical calculation is complicated or not available in the current software.

Local Polynomial Regression

Local Polynomial Regression and SIMEX

This paper introduces a new local polynomial estimator and develops supporting asymptotic theory for non-parametric regression in the presence of covariate measurement error. We address the measurement error with Cook and Stefanski’s simulation-extrapolation (SIMEX) algorithm. Our method improves on previous local polynomial estimators for this problem by (1) using a bandwidth selection procedu...

Robust Regression in Stata

In regression analysis, the presence of outliers in the data set can strongly distort the classical least squares estimator and lead to unreliable results. To deal with this, several robust-to-outliers methods have been proposed in the statistical literature. In Stata, some of these methods are available through the commands rreg and qreg. Unfortunately, these methods only resist to some specif...

Telecommunications Help Desk

Troubleshooting problems Moves, adds and changes to telephone equipment or service New service, voicemail, caller menus, special calling features and plans, caller ID, music on hold, international dialing Fax machines and codes, headsets [2], conference calls [3], speaker phone rental [4] Call accounting and billling Telephone bill login [5] We also manage plans, orders, service, billing and tr...