# Research Design, methodology

- [Methods: Overview, resources](https://globalimpact.gitbook.io/untitled/methodological-discussion/section-introduction-wip.md)
- ["Qualitative" design issues](https://globalimpact.gitbook.io/untitled/methodological-discussion/qualitative-design-issues.md): Discussion of issues in designing experiments/studies that are not specifically 'quantitative', but are important for gaining clear and useful inference
- [Real-world assignment & inference](https://globalimpact.gitbook.io/untitled/methodological-discussion/splits-randomization.md): Geographic blocks versus individuals How to block/stratify
- [Geographic segmentation/blocked randomization](https://globalimpact.gitbook.io/untitled/methodological-discussion/splits-randomization/geographic-segmentation-blocked-randomization.md): Discussion of blocking/randomizing treatments by post/zip code or other region, allowing us to more accurately tie treatments to ultimate outcomes
- [Difference in difference/'Time-based methods'](https://globalimpact.gitbook.io/untitled/methodological-discussion/splits-randomization/difference-in-difference-time-based-methods.md)
- [Facebook split-testing issues](https://globalimpact.gitbook.io/untitled/methodological-discussion/splits-randomization/facebook-split-testing-etc.md)
- [Simple quant design issues](https://globalimpact.gitbook.io/untitled/methodological-discussion/simple-quant-design.md): How many observations, how to assign treatments, etc.
- [Adaptive design/sampling, reinforcement learning](https://globalimpact.gitbook.io/untitled/methodological-discussion/adaptive-design-sampling-reinforcement-learning.md)
- ['Observational' studies: issues](https://globalimpact.gitbook.io/untitled/methodological-discussion/observational-studies-misc.-issues.md)
- [Analysis: Statistical approaches](https://globalimpact.gitbook.io/untitled/methodological-discussion/analysis-statistical-approaches.md): What to do with the data after you collect it (and what you should put in a pre-analysis-plan).


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