A joint hazard and time scaling model to compare survival curves.

Multivariate permutation test to compare survival curves for matched data

BACKGROUND In the absence of randomization, the comparison of an experimental treatment with respect to the standard may be done based on a matched design. When there is a limited set of cases receiving the experimental treatment, matching of a proper set of controls in a non fixed proportion is convenient. METHODS In order to deal with the highly stratified survival data generated by multipl...

Permutation Tests to Compare Survival Curves for Matched Data

Riassunto: L’obiettivo di questo lavoro è sviluppare un test per il confronto della sopravvivenza tra gruppi di soggetti appaiati in proporzione non fissa. L’appaiamento produce dati stratificati, con strati spesso di dimensione esigua e con forme di dipendenza entro strato difficili da identificare. Si è pertanto esplorato, in questo contesto, l’uso di test di permutazione quale possibile alte...

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Association between prostate specific antigen change over time and prostate cancer recurrence risk: a joint model

Background: Prostate specific antigen (PSA) is an important biomarker to monitor patients after treated with radiation therapy (RT). The aim of this study is to evaluate the relationship between the PSA data and prostate cancer recurrence using the joint modeling. Methods: This historical cohort study was performed on 422 prostate cancer patients. Inclusion criteria included: patients with loc...

the innovation of a statistical model to estimate dependable rainfall (dr) and develop it for determination and classification of drought and wet years of iran

آب حاصل از بارش منبع تأمین نیازهای بی شمار جانداران به ویژه انسان است و هرگونه کاهش در کم و کیف آن مستقیماً حیات موجودات زنده را تحت تأثیر منفی قرار می دهد. نوسان سال به سال بارش از ویژگی های اساسی و بسیار مهم بارش های سالانه ایران محسوب می شود که آثار زیان بار آن در تمام عرصه های اقتصادی، اجتماعی و حتی سیاسی- امنیتی به نحوی منعکس می شود. چون میزان آب ناشی از بارش یکی از مولفه های اصلی برنامه ...