The purpose of this research is important, is to study the factors of service quality that deliver results on brand loyalty D TAC. Of a group of teenagers Cu The square and create equation by means of quantitative research.Users DTAC teenagers chamchuri square. The questionnaires, the coefficient of reliability 0.978 were analyzed by using the multiple regression analysis (Multiple Regression Analysis) were factor service quality (y). What is the factor can touch x1) factors of trust (x2) factors of the response (x3).05 equation Y ̂ = 0.575 (0.130) X1 (0.212) X2 (0.095) X3 (0.119) X4 (0.347) X5
key words: quality, service, loyalty
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