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Education is one of the important sectors to contribute the quality of human resources in Indonesia, education is indicator of human development index trough mean years schooling and expected years of schooling. One of education problems in Indonesia is a high number of drop out. In 2017 Indonesia has 31,123 drop out in a grade of senior high school. Drop out is students who leave school before graduation at a certain grade of education, the lower drop out numbers the better education. East Java is the province with the most number of student drop out of school population after West Java, in amount to 3,850 for senior high school in 2017.

This research method using Generalized Poisson Regression to find out the factors that affect the number of student dropped out of school in East Java. Poisson regression commonly used regression model for count data that assumed mean is equal to variance. In the fact this assumption is difficult to realize, there is overdispertion, its means mean is not equal with variance so the models that can be used is generalized poisson regression. Based on the research that has been done, get the results is variables that effect significantly to the number of student drop out in East Java was percentage of poor people and expectation years of schooling. If percentage of poor people rises, drop out increase. If expectation years of schooling rises, drop out decrease.

East Java, Drop Out, Generalized Poisson Regression