Economics 184 Sampling 166 Statistics 113 sampling 44 Social sciences 42 Sampling (Statistics) 41 Probability 36 Methodology 33 Soil Science and Agricultural Chemistry 33 History 30 Research 30 Plant Biotechnology 27 Agricultural Extension 26 Sampling Theory 26 Agriculture 23 Plant Pathology 23 Statistical methods 23 probability 22 regression 21 History and criticism 20 Philosophy 20 Research methodology 18 Mathematical statistics 17 Interviewing techniques 15 statistics 15 Agricultural Entomology 14 Regression analysis 14 Probabilities 13 Qualitative research 13 Random sampling 13