Undergraduate can use mixed OLS to deal with panels. For panel data, three models can be used: mixed OLS(POLS), random effect (RE) and fixed effect (RE). I can't write my graduation thesis at all. If you are writing a paper, you will generally use the fixed or double fixed mode directly and mindlessly. However, if you are writing a big homework or the teacher asks for a test, you need to mix OLS, random effects and.

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Introduction to panel data

In the linear regression model of panel data, for different sections or different time series, if only the intercept term of the model is different and the slope of the model is the same, this model is called fixed effect model. In addition to fixed effect model, typical panel data analysis methods include random effect model and mixed effect model.

Fixed effect model (FEM) assumes that all included studies have the same real effect quantity, while the real effect in random effect model (REM) varies with different studies. Based on different modes of operation, the average comprehensive effect is also different. As early as 1976, the first Meta analysis used FEM to merge meta, based on its statistical simplicity and heterogeneous cognition.

Therefore, the finite element method has been widely used. Until 2006, three-quarters of meta-analysis articles were still in use. However, with the continuous updating of methodology and the understanding of heterogeneity, the understanding and analysis of the internal structure of evidence merger by methodological researchers gradually began to question the "ideal" state of FEM. Subsequently, the finite element method was gradually used to replace part of the finite element method.