Psychometrics · Research · Statistics · Psychology

The Science of Human Behavior, Measured.

A digital space at the intersection of psychological theory and empirical analysis — dedicated to psychometrics, quantitative methodology, and the psychology of the digital world.

About

I’m Giorgi Tchumburidze – Associate Professor of Psychology and head of the Psychology in the Digital World program at BTU (Business and Technology University) in Tbilisi, Georgia. My work focuses on educational assessment, psychometric validation, and large-scale studies like PISA, PIRLS, and TIMSS. This site is my professional home: a place for research, tools, and writing about the measurement of human behavior.

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65
Interactive Modules
56K
Lines of R Code
8
Topic Areas
3
ILSAs Covered

Current Research

PISA

Psychological Predictors of Reading Achievement

Evidence from PISA Georgia — examining how self-efficacy, growth mindset, and belonging predict reading literacy.

Digital Divide

Digital Divide 2.0

Combining PISA 2022 data with primary survey research to examine digital inequality among Georgian students.

Psychometrics

PSS-10 & Self-Efficacy Scale Validation

Psychometric validation of Georgian versions of the Perceived Stress Scale and General Self-Efficacy Scale.

Cultural Psychology

Cultural Life Scripts Replication

A 2026 replication of the 2016 Cultural Life Scripts study in the Georgian context.

Open Source Tool

Statistical Concepts Explorer

An interactive R Shiny application with 65 modules covering introductory statistics through advanced psychometrics. Built with ~56,000 lines of R code across 8 topic areas.

Explore SCE →
R CONSOLE
library(shiny)
library(mirt)
library(lavaan)
# 65 modules, 8 topics
# From descriptive stats
# to advanced IRT models
runApp(“SCE”)

Teaching

Psychology in the Digital World

A program at BTU exploring how digital technologies shape human cognition, behavior, and well-being. Courses cover research methodology, psychometrics, and the intersection of psychology with technology.

Research Methods Psychometrics PISA / PIRLS / TIMSS Digital Psychology

Latest from the Blog

Recent articles on psychometrics, R tutorials, research notes, and more.

  • Sample Size: How Much Data Do You Actually Need?
    “How many participants do I need?” It’s probably the single most common question students and early-career researchers ask me when they’re designing a study. And it’s a fair question, you can’t conduct research without knowing how much data to collect. … Read more
  • From SPSS to R – Why the Switch Matters
    If you studied psychology in Georgia, or in most of the world, really, you learned statistics through SPSS. You opened the data, you clicked through menus, you got tidy output tables, and you wrote up your results. SPSS has been … Read more
  • PsychoMetrika APP – Item Analysis for Teachers and Lecturers, Without the Code
    If you teach, you give tests. Quizzes, midterms, finals, classroom assessments. They’re a core part of how we measure what students have learned. But here’s a question most teachers never ask: how good are your tests, actually? Most assessment in … Read more