### Abstract:

The objectives of this research are: to study the characteristics of students in the Faculty
of Engineering at Rajamangala University of Technology Pra Nakorn, North Bangkok Campus,
that influence to the risk of withdrawal from Calculus 2 for Engineers; to predict the risk of
withdrawal from Calculus 2 for Engineers; and to use the results of the study for planning and
solving the problems of withdrawal from Calculus 2 for Engineers. The sample is 226 students in
the Faculty of Engineering at Rajamangala University of Technology who enrolled the Calculus 2
for engineers in the second semester of the academic year 2009. The data are from the
questionnaire. The factors considered are grad point average, the number of enrollments for the
Calculus 1 for engineers, Calculus 1 for Engineers grade, the number of courses that emphasize
on calculation that were enrolled in the second semester of the academic year 2009, the sacrifices
of students for the Calculus 2 for Engineers course and the need to withdraw from Calculus 2 for
Engineers course before other courses. The logistic regression model in which the parameters are
estimated by using Bayesian methods is used for analyzing the data. The study shows that the
factors that influence to the risk of withdrawal from the Calculus 2 for Engineers are grade point
average, Calculus 1 for Engineers grade, the number of courses that emphasize on calculation that
were enrolled in the second semester of the academic year 2009 and the sacrifices of students for
the Calculus 2 for Engineers and the need to withdraw from Calculus 2 for Engineers before other
courses. The factor that does not influence to the risk of withdrawal from the Calculus 2 for
Engineers is the number of enrollments for the Calculus 1 for Engineers.