Statistical Consultation Line: (865) 742-7731
Accredited Professional Statistician For Hire
  • Contact Form

Psychometrics

Psychometrics is the science that produces empirical evidence for survey instruments

Psychometrics is the science related to the creation, use, and interpretability of survey instruments.*  There are two primary types of psychometric analysis:  Reliability and validity.

Reliability, as grounded in Classical Test Theory (CTT), relates the the consistency, confidence, and precision of outcomes and survey instruments.

Validity is evidence of internal structure, consequences of testing, interpretability, generalizability, associations, and accuracy of outcomes and survey instruments.

In psychometrics, reliability evidence is usually generated first with a pilot study that postulates a given factor structure for the construct of interest. Validity evidence is then yielded in another larger study that confirms the theory and structure of the construct yielded in the pilot study and construct specification.

​Psychometrics play a pivotal role in creating and validating assessment tools used in clinical practice.

Reliability and validity

Reliability is the stability, consistency and precision of measures and outcomes.
Reliability
Validity is the utility, interpretability, and accuracy of measures and outcomes.
Validity

Principal Components Analysis and Confirmatory Factor Analysis

Principal Components Analysis (PCA) is often performed in tandem with reliability. It reduces survey data and accounts for maximum variance in a construct.
Principal Components Analysis
Confirmatory Factor Analysis (CFA) provides evidence that validates the findings from PCA and reliability analyses. CFA is performed in tandem with validity.
Confirmatory Factor Analysis

Back to Research
Research Engineer Home Page

Hire A Statistician

$100.00
Buy Now

DO YOU NEED TO HIRE A STATISTICIAN?

Eric Heidel, Ph.D., PStat will provide you with statistical consultation services for your research project at $100/hour. Secure checkout is available with Stripe, Venmo, Zelle, or PayPal.

  • Statistical Analysis on any kind of project
  • Dissertation and Thesis Projects
  • DNP Capstone Projects
  • Clinical Trials
  • Analysis of Survey Data

*Furr RM, & Bacharach, VR. (2008). Psychometrics:  An introduction. Thousand Oaks, CA: Sage.

Picture

Contact Dr. Eric Heidel
[email protected]
(865) 742-7731

Copyright © 2024 Scalë. All Rights Reserved. Patent Pending.