Kilem Li GwetKilem Li Gwet, PhD, received his doctorate in Mathematics from Carleton University's School of Mathematics and Statistics, Ottawa (Canada), in 1997. His research focused on the design and analysis of statistical surveys. Over the years, his research nterests have expanded to include inter-rater reliability, a field in which he has authored numerous influential books and papers. His work on inter-rater reliability can be explored through his profile on ResearchGate.Dr. Gwet's expertise in multivariate data analysis led him to apply Principal Component Analysis (PCA) to inter-rater reliability data. This experience inspired him to author his first book on PCA, which offers a mathematically rigorous yet practical approach using Microsoft Excel for implementation. His work on PCA provides a valuable resource for researchers and analysts seeking to understand and apply this important statistical technique.Dr. Gwet is always open to feedback and inquiries. You can reach him at gwet@agreestat.com, and he will respond promptly. Read More Read Less