## A Curated List of Our Postings on Technical Topics – Your One-Stop Shop for Methodology

**Random Assignment, Registration and Reporting**

Doing stratified randomization with uneven numbers in the Strata [3]

How to randomize using many baseline variables [4]

Public randomization ceremonies [5]

Designing experiments to measure spillover effects [6]

Mechanism experiments [7] and opening up the black box [8]

Sample weights and RCT design [9]

A pre-analysis plan check-list [10]

The New Trial Registries [11]

What isn’t reported in impact evaluations but maybe should be [12]

Randomization checks: testing for joint orthogonality [13]

**Propensity Score Matching**

Guido Imbens on clustering standard errors with matching [1]

Testing different matching estimators as applied to job training programs [14]

The covariate balanced propensity score [15]

**Difference-in-Differences**

The often unspoken assumptions behind diff-in-diff [16]

**Other Evaluation Methods**

The synthetic control method [17], as applied to regulatory reforms

Regression discontinuity with an implicit index [18]

Using spatial variation [19] in program performance to identify impacts

Small n impact evaluation methods [20]

Can we trust shoestring evaluations? [21]

**Analysis**

Regression adjustment in randomized experiments (part one [22], part two [23])

When to use survey weights [24] in analysis

Adjustments for multiple hypothesis testing [25]

Bounding approaches to deal with attrition [26]

Linear probability models versus probits [27]

Dealing with multiple lotteries [28]

Estimating standard errors with small clusters (part one [29], part two [30])

Decomposition methods [31]

Estimation of treatment effects with incomplete compliance [32]

**Power Calculations and Improving Power**

Does the intra-cluster correlation matter for power calculations if I am going to cluster my standard errors? [33]

Power calculations for propensity score matching [34]

Power calculations 101: dealing with incomplete take-up [35]

Collecting more rounds of data to boost power [36]

Improving power in small samples [37]

**On External Validity**

Weighting for external validity [38]

Will that successful intervention over there get results here? [39]

Learn to live without external validity [40]

Why the external validity of regression estimates can be less than you think [41]

Why similarity is the wrong concept for external validity [42]

A rant on the external validity double standard [43]

**Jargony Terms in Impact Evaluations**

The Hawthorne Effect [2]

The John Henry Effect [44]

Placebo effects [45]

Clinical Equipoise [46]

**Stata Tricks**

Graphing impacts with Standard Error Bars [47]

Calculating the intra-cluster correlation [48]

Generating regression and summary statistics tables in Stata: A checklist and code [49]

- Tags:
- Difference-in-difference [50]
- statistical power [51]
- propensity score [52]
- external validity [53]
- randomization [54]
- Life the Universe and Everything [55]