Correct spelling for the English word "GEQML" is [d͡ʒˈɛkmə͡l], [dʒˈɛkməl], [dʒ_ˈɛ_k_m_əl] (IPA phonetic alphabet).
GEQML stands for Generalized Expectation Maximization Quasi Maximum Likelihood, which is a statistical estimation technique used in econometrics. It is a generalized version of the Expectation Maximization (EM) algorithm that incorporates the Quasi Maximum Likelihood (QML) method.
In the field of econometrics, GEQML refers to a two-step estimation procedure that aims to estimate the parameters of a statistical model. The first step is the Expectation Maximization algorithm, which is an iterative method that computes maximum likelihood estimates for models with incomplete or missing data. This step involves computing the expected values of the missing data, based on initial parameter estimates, and then maximizing the likelihood function.
The second step, the Quasi Maximum Likelihood method, is used to estimate the parameters once the expected values of the missing data are obtained. Quasi Maximum Likelihood is a robust estimation technique that accommodates heteroscedasticity, which is a situation where the error terms have different variances. This method allows for more accurate parameter estimation when there are deviations from the assumption of constant error variances.
Overall, GEQML combines the EM algorithm's ability to handle missing values with the Quasi Maximum Likelihood's robustness to heteroscedasticity. By doing so, it provides a powerful estimation technique that can be used in econometric models with missing data and heteroscedastic errors.