Differences in birth weight associated with the 2008 Beijing Olympic air pollution reduction: results from a natural experiment
Operators conduct the natural experiments
within a broad framework, and the focus of learning is on locating what is working and how it can be replicated or scaled while dampening unwanted consequences at an early moment.
But the same natural experiment
may fail in a country with a
In the empirical part, I apply the assessment algorithm to five examples of natural experiments
from modern Political Science.
In Darwin's case, his interpretation of what happens to finches when they are isolated from each other on different islands of the Galapagos, is one of the best known natural experiments
in all of science.
The results of simulations obtained using numerical finite element models match the findings of natural experiments
5) El-Gamal and Sundaram (1993) highlight the importance of natural experiments
Product usability testing can be conceptualized as quasi and natural experiments
In natural experiments
, comparable populations, in this case the populations of entire states, voluntarily assign themselves different levels of risk.
But the number of observations is not very large and I am not convinced that adding more data points in order to improve statistical significance by going back and including earlier elections would particularly helpful to resolve the difficulties posed by this small number (which is that when the number of natural experiments
is small, accurate statistical inference is difficult).
and elsewhere have provided economists with a series of natural experiments
, allowing them to investigate the impact of tax changes on individual and economic behavior.
Although the difficulties associated with using natural experiments
to analyze the behavior of very rich people are potentially serious, in this paper I will not seek to criticize the methods of the NTR literature.