Meta-study of Researches Factors influencing theft during years 85 to 96 in Tehran metropolis and strategies to deal with it

The purpose of the present study was don meta-study about research done in relation to the theft during the years 85 to 96 in Tehran metropolis. 10 studies were identified in the field the occurrence of theft. The results part of the meta-theory and meta-method showed that the researches carried out on the subject of the research except in cases (the analytical model extracted from the theoretical framework and basics review, preliminary test of measuring instrument, operational definition, assess reliability and validity, the mention of research limitations and barriers and ethical considerations) are at a rather favorable level and also, the results of meta-analysis showed that the combined effect size index in the field of factors affecting of theft in the fixed model is 0.438 and randomized model 0.414,which according to Cohen's criterion, had a large amount of effect size. But in a separate survey, in the area of effective factors in the occurrence of theft effect size of individual factors was more than family and cultural-social factors. Results demonstrated that the publication bias in meta-analysis sample. Due to the heterogeneity in the studies, the moderators were analyzed which showed the moderating effect of the year and the sampling method.