Question

مدل های تغییر رفتار ارائه شده در مطالعه، در جزئی شدن فاکتورها تردیدی به خود راه نداده اند،

Answer 1

(The following translation is based on pure guesswork. The reason is that the original sentence in Persian is not very meaningful: چه طور ممکن است که مدل ها در جزئی شدن  فاکتورها تردید نکنند!)

The models for changed behaviour (or, maybe, "the changes in behaviour patterns") presented in this study have been unrelenting/unyielding in reducing the effect of the factors.