Bøker utgitt av Sage Publications Inc Ebooks

This volume addresses the issue of linear constraints in regression modeling. Author Roger A. Wojtkiewicz uses the method of knotted spline variables (also known as piecewise linear regression) and a new method involving group spline variables to model nonlinearity in a variety of situations. Using spline variables to model nonlinearity allows researchers to specify unrestricted models for models that involve interval variables, allowing for greater flexibility in modeling any possible interaction.

This text describes how to design and analyze small efficacy or evaluation studies, typically carried out as part of the development of programs or interventions in areas such as education. The authors provide guidance on designs for small, randomized trials, and also non-randomized causal designs. The final section compares research designs, discusses approaches to choosing a design, and provides guidance on reporting.

This method involves research participants listing what they know or think about the researcher's topic. This book incorporates free-list analyses with other analytical methods and demonstrates their broad applicability. The book starts with descriptive methods, then outlines a predictive statistical framework. The author explains how to collect, clean, and manage free-list data and how to use R to calculate and visualize them.

Qualitative diary methods (QDMs) are a versatile range of multi-modal data collection methods that involve participants recording events and experiences, and emotions and reflections, as they happen, on multiple occasions and over a particular time period. These data collection methods include a pen and paper diary, as well as other electronic modes of diary keeping, including text but also audio, photo-, video-, and app-based diaries that allow for a range of modalities.