This paper investigates the impact of immigration on the college enrollment of U.S. natives. Many studies have focused on the effect of increased demand for schooling by immigrants on the enrollment of natives. However, changes in immigrant labor supply may also affect native enrollment by changing local market prices. Using U.S. Census data from 1970 to 2000, I find that state-level increases in the number of immigrant college students do not significantly lower the enrollment rates of U.S. natives. On the contrary, state-level increases in the ratio of unskilled immigrant workers to skilled immigrant workers significantly raise native enrollment rates. These findings suggest that the demand for college is sensitive to wage rates and that college slots are flexibly supplied over a decadal time horizon.
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SUMMARYTests of the log normal distribution versus the exponential distribution were proposed by Cox (1961, 1962), who gave their large-sample distributions. We investigate the adequacy of the asymptotic results and give power functions of the tests. We then use Cox's general results to derive tests for the log normal distribution versus the gamma distribution. Finally, we compare the performance of the separate family tests of the exponential versus the log normal distribution with that of other tests for departure from the exponential distribution.
A. Y. JACKSON
A test for a Poisson process based on ordered sample values is proposed and its distribution and other properties derived. The test statistic is shown to be asymptotically normal and some further approximations to its distribution are investigated. The asymptotic relative efficiency of the test with respect to the asymptotically most powerful test against the alternative of gammadistributed intervals is derived. Finally, a test for an incomplete sample is outlined.
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