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Welcome to the eGyanKosh page dedicated to “Block-3: Diagnostics of Model Assumptions and Variable Selection,” an essential study material for students enrolled in the IGNOU 2025 curriculum. This resource is designed to enhance your understanding of critical concepts related to statistical modeling, including the validation of model assumptions and the strategic selection of variables for analysis. As part of our commitment to providing accessible education, we offer this comprehensive study material for free download, empowering you to delve deeper into these vital topics and excel in your academic journey. Explore the resources available here and take the next step in mastering the complexities of model diagnostics and variable selection.