Abstract:
Methods and apparatuses for measuring parameters of integrated circuit devices may be provided. The methods may include performing detecting operations on samples to obtain a set of data. Each detecting operation may include irradiating a light beam to the samples using a light irradiation part and detecting reflected light from the samples using a light detector. The samples may have values of a parameter different from one another. The method may also include obtaining a principal component based on the set of data and obtaining a regression model for the parameter using the principal component and values of the parameter of the samples.