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Clustering is a phenomenon commonly observed across social science research--students are clustered in classrooms, individuals in households, and companies within industrial sectors, to name but a few examples. This book presents an elementary and systematic introduction to modeling of between-cluster variation, how results are best interpreted, and computational methods for estimation. The book addresses many important issues in the social sciences that can be best described in terms of variation sources and patterns, such as temporal, between-person, and geographical variation. By providing a balanced presentation of the advantages and limitations of these methods, the author has provided an introduction to the subject that will be of great utility to statisticians and students concentrating on social science data analysis.

The WhisperWarm DC Ceiling Mount Fan/Heater (FV-0511VH1) combines powerful ventilation with efficient heating to create a comfortable and healthy indoor environment. Perfect for both new and retrofit installations, this unit features a high-performance 1600W Positive Temperature Coefficient (PTC) heater for instant warmth and a revolutionary ECM motor with SmartFlow Technology to ensure optimal airflow and energy efficiency. With the Pick-A-Flow Airflow Selector, users can easily choose between 50, 80, or 110 CFM to meet various ventilation needs. The WhisperWarm DC also boasts a low-profile grille with a built-in diffuser, advanced heating capabilities, and a flexible installation system for easy setup in both old and new constructions. Ideal for remodeling projects or adding comfort to spaces like bathrooms or assisted living facilities, this fan/heater offers superior performance and easy code compliance for professionals. Color: White.

PureHeat 2-in-1 heats using a cutting-edge PTC (Positive Thermal Coefficient) element that heats the air efficiently without drying it out. It purifies your air with PCO technology that features a high power germicidal UVC bulb. This bulb creates a purifying plasma that reduces mold, bacteria and viruses (even on surfaces) so the months spent with doors and windows closed no longer means months spent in a stuffy indoor environment. Color: Black/Stainless.