The article introduces a new test for panel data models that helps researchers check if their models are accurate. This test is like a quality check for the models. By using a special method, the researchers can estimate the model and calculate the test result. The test result follows a standard pattern, making it easy to compare with known values. A correction is also applied to improve the accuracy of the test. This correction helps to consider the errors in the estimation process and gives better results, especially when dealing with small amounts of data.