Statistical methods Social sciences 721 Quality control 522 Statistics 327 Computer programs 313 Engineering 298 Process control 262 Research 251 Economics 202 Data processing 200 Commercial statistics 183 Production management 156 Methodology 144 Management 135 Six sigma (Quality control standard) 130 Probabilities 128 Mathematical models 121 Mathematical statistics 95 Experimental design 94 Industrial management 88 Reliability (Engineering) 85 Signal processing 67 Psychology 66 Science 65 Decision making 62 SPSS (Computer file) 61 Medicine 60 SPSS for Windows 53 Forecasting 48 Data mining 45