Calculus 23 Probability Theory 23 Stochastic Processes 21 Design of Experiments 17 Operations research 17 Computer 16 Applied Numerical Analysis 14 Probability and Statistics 12 Mathematical Statistics 10 Sampling 9 Statistics 9 Algebra 8 Inference 6 Economic development 5 Operations Research-- Information management-- Executive management 5 Probabilities-- Applied mathematics 5 Algebra-- Mathematics 4 Mathematics 4 Topology 4 regression 4 sampling 4 Econometrics 3 INTRODUCTORY POLYMER CHEMISTRY 3 Integer programming 3 Pedagogical algebra-- Mathematics 3 Physical biochemistry 3 Rural development 3 Rural sociology 3 Simplex method 3 Transportation models 3