random error

Member Training: Confusing Statistical Terms

February 28th, 2020 by

Learning statistics is difficult enough; throw in some especially confusing terminology and it can feel impossible! There are many ways that statistical language can be confusing.

Some terms mean one thing in the English language, but have another (usually more specific) meaning in statistics.  (more…)

Confirmatory Factor Analysis: How To Measure Something We Cannot Observe or Measure Directly

June 18th, 2018 by

by Christos Giannoulis, PhD

Many times in science we are intrigued to measure an underlying characteristic that cannot be observed or measured directly. This measure is hypothesized to exist to explain variables, such as behavior, that can be observed.

The measurable variables are called manifest variables. The unmeasurable are called latent variables.

Latent variables are often called factors, especially in the context of factor analysis.


5 Ways to Increase Power in a Study

June 12th, 2009 by

To increase power:

  1. Increase alpha
  2. Conduct a one-tailed test
  3. Increase the effect size
  4. Decrease random error
  5. Increase sample size

Sound so simple, right?  The reality is that although these 5 ways all work (more…)