Meta-study of Researches Factors influencing theft Prevention during years 85 to 96 in Tehran metropolis and related strategies

The purpose of this study is to conduct a meta-study (including trans-theoretical, meta-analysis and meta-analysis) on research on factors affecting the prevention of theft during the years 85-96 in the metropolis of Tehran. Eighteen studies in the field of theft prevention through internet search in domestic databases and manual search in organizations and universities in Tehran, were identified and related information was analyzed. In order to collect data, a checklist was compiled based on the existing theoretical foundations and the data were collected using it. The results of meta-theory and meta-method showed that the researchers conducted in the field of research subject (except in the cases of analytical model extracted from the theoretical framework and background study, preliminary test of measuring device, operational definition, measurement of reliability and validity, mentioning limitations and obstacles of research and ethical considerations ) And also the results of the meta-analysis showed that the size index of the combined effect of r in the field of factors affecting the prevention of theft in the fixed model was 0.695 and in the random model was 0.636, which according to Cohenchr('39')s criterion was considerable. But in a separate study, in the field of factors affecting the prevention of theft, the effect of the category of disciplinary factors was more than the categories related to security and socio-cultural factors. The results of Egger regression test, N-error-free test, dual and tweedy correction and fitting test and funnel diagram showed no diffusion bias in the meta-analysis sample. Due to the heterogeneity in the studies, the moderators were analyzed, which indicates the modulating effect of the research sampling method in the field of factors affecting the prevention of theft.