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Iranian Journal of Health Sciences، جلد ۱، شماره ۳، صفحات ۵۸-۷۰
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عنوان انگلیسی A New Nonparametric Regression for Longitudinal Data
چکیده انگلیسی مقاله In many area of medical research, a relation analysis between one response variable and some explanatory variables is desirable. Regression is the most common tool in this situation. If we have some assumptions for such normality for response variable, we could use it. In this paper we propose a nonparametric regression that does not have normality assumption for response variable and we focus on longitudinal data. Materials and Methods: Consider nonparametric estimation in a varying coefficient model with repeated measurements ( X tij Yij ij, , ), for i=1, …, n and j =1 ,… , ni where Xij=TXijo Xijk ( ,..., ) and ( X tij Yij ij , , ) denote the jth outcome , covariate and time design points, respectively , of the ith subject. The model considered here is Y (tij) i (tij) T Yij ij    , where ( )  ( 0 ( ),..., ( )) , for k  0 T t k  t  t  , are smooth nonparametric functions of interest and (t )  i is a zero-mean stochastic process. The measurements are assumed to be independent for different subjects but can be correlated at different time points within each subject. For evaluating this model, we use data of a cohort of 289 healthy infants born in Shiraz in 2007. The proposed nonparametric regression was fitted to them for obtaining effect rates of mother weight, mother arm circumference and maternal age at delivery time and maternal age at first menarche on boy’s arm circumference. Results: proposed nonparametric regression showed the varied effect of each independent variable over the time but other models achieved constant effect over the time that is in controversy with the inherent property of these natural phenomena. Conclusion: This study shows that this model and the spline nonparametric estimator could be useful in different areas of medical and health studies.
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نویسندگان مقاله حامد تابش | hamed tabesh
ph.d. of biostatistics, department of biostatistics and epidemiology, school of health, ahvaz jundishapur university of medical sciences

سازمان اصلی تایید شده: دانشگاه علوم پزشکی جندی شاپور اهواز (Ahvaz jundishapur university of medical sciences)

آزاده ساکی | azadeh saki
ph.d. of biostatistics, department of biostatistics and epidemiology, school of health, ahvaz jundishapur university of medical sciences

سازمان اصلی تایید شده: دانشگاه علوم پزشکی جندی شاپور اهواز (Ahvaz jundishapur university of medical sciences)

سمیرا مردانیان | samira mardaniyan
msc. student of biostatistics, department of biostatistics and epidemiology, school of health, ahvaz jundishapur university of medical sciences

سازمان اصلی تایید شده: دانشگاه علوم پزشکی جندی شاپور اهواز (Ahvaz jundishapur university of medical sciences)

نشانی اینترنتی http://jhs.mazums.ac.ir/browse.php?a_code=A-10-343-16&slc_lang=en&sid=en
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زبان مقاله منتشر شده en
موضوعات مقاله منتشر شده مدیریت خدمات بهداشتی و درمانی
نوع مقاله منتشر شده پژوهشی
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