The National Academies of Sciences, Engineering, and Medicine are private, nonprofit institutions that provide expert advice on some of the most pressing challenges facing the nation and world. Our ...

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Do You Know This Bird? Use this illustration of a California condor to observe its features and make inferences about its behavior and habitat. In the first column, make a list of your observations of ...

Cluster-robust inference and estimation methods have emerged as indispensable tools in empirical research, enabling statisticians and economists to draw valid conclusions from data exhibiting ...