The present guide provides a practical guide to conducting latent profile analysis (LPA) in the Mplus software system. This guide is intended for researchers familiar with some latent variable modeling but not LPA specifically. A general procedure for conducting LPA is provided in six steps: (a) data inspection, (b) iterative evaluation of models,…

A tutorial introduction to data models in general is provided, with particular emphasis on the relational and network models defined by the two proposed ANSI (American National Standards Institute) database language standards. Examples based on the network and relational models include specific syntax and semantics, while examples from the other…

Shocked by static? Mixed up about magnets? Curious about currents? Teachers can get past memorizing all those electricity-related formulas, rules, and procedures so they can understand the subject at a level deep enough to teach it with confidence and comfort. Here to help is "Electricity and Magnetism," the fifth title in the award-winning NSTA…

Suggests a model for using a spreadsheet to allocate academic library salary increases. Seven variables are incorporated in the model: (1) experience; (2) difficulty of the job; (3) initiative; (4) cost of living; (5) inflation; (6) equity; and (7) merit. One reference is listed. (MES)

Developed to identify and qualitatively assess computer system evaluation techniques for use during acquisition of general purpose computer systems, this document presents several criteria for comparison and selection. An introduction discusses the automatic data processing (ADP) acquisition process and the need to plan for uncertainty through…

Presents a planning model for the automation of operations in a large hospital library and specifically describes the design and implementation of a local area network. Part 1 deals with the evolution of the idea, system planning, and design, and Part 2 addresses installation and implementation issues. (EM)