The geometric tolerancing (GPS or GD&T) has increasing importance in machine design, manufacturing and measuring. The geometric tolerances define the deviation of the different kinds of geometric elements in more sophisticated way, than dimensional tolerances. Nevertheless, the application of them requires more wariness in design process, manufacturing process planning and measuring. The key element is the measuring, when the requirements have to be inspected according to the standards, and striving to the maximal productivity and accuracy. The paper presents a new method to evaluate the flatness deviation by limited number of measured points and it uses regression analysis based on partial point sets. The method considers the observation, than the number of measured points increases the evaluated flatness values. The article presents the new method, the results of test, which support it and the result of verification tests also.

几何公差（GPS或GD＆T）在机械设计，制造和测量中的重要性日益提高。几何公差比尺寸公差以更复杂的方式定义了各种几何元素的偏差。然而，它们的应用需要在设计过程，制造过程计划和测量中更加谨慎。当必须根据标准检查要求时，关键要素是测量，并努力实现最大的生产率和准确性。本文提出了一种通过有限数量的测量点来评估平面度偏差的新方法，并使用了基于局部点集的回归分析。该方法考虑了观察，而不是通过测量点的数量来增加评估的平坦度值。