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research design

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Model Perspective
Model Perspective
May 31, 2025 · Fundamentals

Unlocking Everyday Natural Experiments: Design, Examples, and Analysis

This article explains what natural experiments are, how they differ from controlled trials, and provides practical steps, classic cases, and analytical methods like DID, RDD, and IV to help readers discover and design credible real‑world experiments.

Difference-in-Differencescausal inferenceinstrumental variables
0 likes · 10 min read
Unlocking Everyday Natural Experiments: Design, Examples, and Analysis
Model Perspective
Model Perspective
May 4, 2025 · Fundamentals

Assumptions vs. Hypotheses in Mathematical Modeling: When to Use Each?

This article clarifies the distinct roles of assumptions and hypotheses in mathematical modeling, explains their typical forms and verification requirements, provides practical examples, compares their key dimensions, and offers guidelines for writing high‑quality assumptions and testable hypotheses.

assumptiondata validationhypothesis
0 likes · 8 min read
Assumptions vs. Hypotheses in Mathematical Modeling: When to Use Each?
Model Perspective
Model Perspective
Jan 10, 2024 · Fundamentals

How Many Survey Responses Do You Really Need? A Practical Guide to Calculating Sample Size

Determining the right sample size is crucial for reliable survey results, and this article explains the key factors—population size, confidence level, margin of error, response rate, and effect size—while walking through a concrete example of calculating the needed respondents for a university library service study.

confidence intervalmargin of errorresearch design
0 likes · 7 min read
How Many Survey Responses Do You Really Need? A Practical Guide to Calculating Sample Size