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Validity and Reliability in Psychological Research

The Crucial Role of Measurement Quality

Ensuring Accuracy and Consistency

Ensuring research findings are accurate and consistent is crucial. Validity and reliability are key concepts in evaluating the quality of psychological research.

Core Definitions

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Validity

Refers to the extent to which a test, study, or measure actually measures what it claims to measure.
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Reliability

Refers to the consistency and repeatability of measurements.

Types of Validity

Validity ensures that research conclusions are justified and accurate representations of the phenomena studied.

A

Internal Validity

Degree to which results can be attributed to the manipulation of the IV rather than other factors. Threats include extraneous variables, confounding variables, demand characteristics, and participant effects. Controlled experiments with randomisation and standardisation tend to have high internal validity.
B

External Validity

Extent to which findings can be generalized beyond the study sample to other people, settings, or times.
  • Population Validity: Can results be generalized to other groups?
  • Ecological Validity: Can results apply to real-life settings?
  • Temporal Validity: Do results hold over time?
C

Construct Validity

The extent to which a test or procedure accurately measures the theoretical construct it is supposed to measure. Important when operationalising variables.
D

Other Validities

Face Validity: Whether a measure looks like it measures what it is supposed to, based on subjective judgement. Concurrent and Predictive Validity: How well a test compares or predicts outcomes relative to established measures.

Measures of Reliability

Reliability ensures that if the study or test were repeated, the results would be consistent.

1

Test-Retest Reliability

Consistency of results when the same test is administered to the same people on two occasions. High correlation indicates good reliability.
2

Inter-Rater Reliability

Degree to which different observers or raters produce consistent scores or judgements. Important for observational and qualitative data coding.
3

Internal Consistency

Extent to which items within a test measure the same construct (e.g., using Cronbach’s alpha).

Methods to Improve Validity and Reliability

Strategies researchers employ to maximize the quality of their findings.

✓

Standardisation

Using consistent procedures and instructions.
✓

Pilot Testing

Trial runs to identify problems with measures.
✓

Clear Definitions

Clear Operational Definitions: Reducing ambiguity in variables.
✓

Training and Measures

Training Observers: To improve inter-rater reliability. Using Established Measures: Psychometrically tested instruments.

Key Threats and Considerations

Factors Reducing Quality

Demand Characteristics: Participants changing behavior based on perceived expectations can reduce validity. Social Desirability Bias: Participants responding in a way that makes them look good. Experimenter Bias: Subtle cues from researchers influencing participant behavior.

Random Error: Fluctuations in measurement due to unsystematic factors reduce reliability.

The Reliability-Validity Link

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Critical Evaluation: Lower reliability limits validity since inconsistent results cannot truly measure constructs. Assessment is essential when critically evaluating research findings.

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Research Validity Deck
Term
Validity in Research

What is validity in research?

Answer
Definition

The extent to which a test or measure accurately measures what it claims to measure.

Term
Internal Validity

What is internal validity?

Answer
Definition

The degree to which results can be attributed to the manipulation of the independent variable rather than other factors.

Term
Threat to Internal Validity

Name a threat to internal validity.

Answer
Examples

Extraneous variables, confounding variables, demand characteristics, or participant effects.

Term
External Validity

What is external validity?

Answer
Definition

The extent to which findings can be generalized to other people, settings, or times.

Term
Types of External Validity

What are the types of external validity?

Answer
Types

Population validity, ecological validity, temporal validity.

Term
Construct Validity

Define construct validity.

Answer
Definition

The extent to which a test accurately measures the theoretical construct it intends to measure.

Term
Face Validity

What is face validity?

Answer
Definition

Whether a measure appears to measure what it is supposed to, based on subjective judgement.

Term
Test-Retest Reliability

What is test-retest reliability?

Answer
Definition

The consistency of results when the same test is given to the same people on two different occasions.

Term
Inter-Rater Reliability

What is inter-rater reliability?

Answer
Definition

The degree to which different observers produce consistent measurements or judgments.

Term
Improving Reliability and Validity

How can reliability and validity be improved?

Answer
Methods

Through standardisation, pilot testing, operational definitions, observer training, and using established measures.

Term
Demand Characteristic Threat

Why is demand characteristic a threat to validity?

Answer
Explanation

Because participants may change behavior to meet perceived expectations, distorting true results.

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🔍 Research Methods Quiz

1. What does internal validity primarily concern?

Internal validity focuses on the causal relationship between the independent and dependent variables, ensuring that changes are due to the manipulation rather than confounds.

2. Which type of validity assesses if findings apply to real-life contexts?

Ecological validity refers to how well findings generalize to natural settings.

3. Which method is best for improving inter-rater reliability?

Training ensures different raters apply coding or judgments consistently.

4. True or False: High reliability guarantees high validity.

High reliability means consistent results but does not ensure the test measures what it is intended to (validity).

5. Which is NOT a threat to validity?

Random error primarily affects reliability, causing inconsistency, rather than validity directly.

📊 Results

  • Notes and Quiz
  • Psychology
  • A Level
  • Research Methods
  • OCR