- A person parameter on the latent scale in the model.
- Rasch (1PL) constrains discrimination; 2PL lets items differ; 3PL adds guessing.
- They spend items near your level.
- Item exposure and coaching are security issues for high-stakes tests.
- A modelling assumption that items are not secretly one item in disguise.
- Inspection-time lite and odd-even switch lite are different item types.
What is theta?
A person parameter on the latent scale in the model. It is not a street IQ and not your 2-back hit count. Práctica — no es un CI clínico.
Rasch versus 2PL?
Rasch (1PL) constrains discrimination; 2PL lets items differ; 3PL adds guessing. Manuals name the model. This site does not run one. Práctica — no es un CI clínico.
Why adaptive tests feel shorter?
They spend items near your level. Short web quizzes that feel hard are not automatically IRT-adaptive. Práctica — no es un CI clínico.
Can I “beat” IRT by practising items?
Item exposure and coaching are security issues for high-stakes tests. Practising this site’s toys is fine; it still is not a licensed theta. Práctica — no es un CI clínico.
Local independence?
A modelling assumption that items are not secretly one item in disguise. Speeded 16-trial clouds violate lots of assumptions. That is expected for a toy. Práctica — no es un CI clínico.
What to try?
Inspection-time lite and odd-even switch lite are different item types. Neither calibrates a published IRT bank. Práctica — no es un CI clínico.
❓ La gente también pregunta
What is construct validity?
Construct validity is the argument that a score reflects a named idea — working memory, not “being clever in general.” It is built from theory, patterns of correlations, and failed rival explanations. A 20-trial number-Stroop lite can feel like control. Feeling is not a validity coefficient. This site never reports a licensed IQ. Práctica — no es un CI clínico.
What is construct validity? →What is criterion validity?
Criterion validity asks whether a score lines up with something you care about that is not the test itself — a later grade, a supervisor rating, or a Wechsler index. Concurrent means measured at the same time; predictive means later. A visual 2-back lite has no published criterion table. It is not an employment screen and not an IQ. Práctica — no es un CI clínico.
What is criterion validity? →What is content validity?
Content validity is whether the item set covers the skill or knowledge you claimed. A spelling test with only the letter Q is a coverage failure. Shape-span lite samples a tiny visuospatial sequence. It does not cover “all spatial intelligence.” Experts, blueprints and reviews build content arguments. A weekend hackathon does not. Práctica — no es un CI clínico.
What is content validity? →What is a confidence interval?
A 95% confidence interval is a procedure: if you repeated the study under the same model, 95% of such intervals would cover the parameter. It is not the probability that this one interval magically contains the truth after you saw it. Licensed IQ manuals turn a standard error into a range around a scaled score. Digit-span lite does not. Treat any integer from this site as a toy count. Práctica — no es un CI clínico.
What is a confidence interval? →What is a g-loading?
In a factor analysis of several tests, a general factor (g) can appear. A subtest’s loading says how much it shares that factor in that sample and battery. Matrices often load high; some speeded motor tasks load lower. A loading is not your worth. N-back lite is not a published g-loading table. This site does not output g. Práctica — no es un CI clínico.
What is a g-loading? →