# Wald test

**WaldWald estimatorWald statisticWald statistics**

In statistics, the Wald test (named after Abraham Wald) assesses constraints on statistical parameters based on the weighted distance between the unrestricted estimate and its hypothesized value under the null hypothesis, where the weight is the precision of the estimate.wikipedia

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### Joshua Angrist

**AngristJoshua D. Angrist**

For instance, Angrist developed a two-stage least squares (2SLS) equivalent of the efficient Wald estimator.

### Wald

**Wald (disambiguation)**

### Ordinary least squares

**OLSleast squaresOrdinary least squares regression**

### List of statistics articles

**List of statistical topicsList of statistics topicsIndex of statistics articles**

### F-test

**F''-testF testF-statistic**

The F-test is a Wald test.

### Chi-squared test

**chi-square testchi-squared statisticChi-squared**