Surveys Social sciences 4 Methodology 3 Research 3 Sampling (Statistics) 3 Social surveys 3 Statistics 3 Empirische Sozialforschung 2 India 2 Information and Documentation 2 Methodologie 2 Umfrage 2 Action Research 1 Agencies and Organizations 1 Agricultural entomology 1 Agriculture 1 Animal Ecology 1 Applied statistics 1 Biological Control 1 Biological control agents 1 Biological pest control agents 1 Case Studies 1 Census 1 Databases 1 Development 1 Documentary sources 1 Economic analysis 1 Environment 1 Error analysis (Mathematics) 1 External validity 1