Alto is properly the term for the second top part in four-part mixed-voice vocal writing. Applied to voices it means no more than can muddle their way through the alto part, which is not saying a whole lot, because the alto part is notoriously mind numbing (not that itâs not an essential part of the whole, or that weâre not grateful for the people who deal with it).
Longitudinal data system. Longitudinal data system is a data system capable of tracking student information over multiple years in multiple schools. The term appears in Federal law of the United States to describe such a system. Federal funding is provided to aid the design and implementation of such systems.
The measurement model is the part which relates measured variables to latent variables. The structural model is the part that relates latent variables to one another. Statistically, the model is evaluated by comparing two variance/covariance matrices. From the data a sample variance/covariance matrix is calculated.