Yıl: 2021 Cilt: 13 Sayı: 1 Sayfa Aralığı: 13 - 27 Metin Dili: İngilizce DOI: 10.5336/biostatic.2020-80208 İndeks Tarihi: 17-02-2022

Comparison of the Statistical Tests for Two Crossing Survival Functions

Öz:
ABSTRACT Objective: Testing the equality of two survival functions is frequently used in survival analysis studies. The most preferred method in the literature is the log-rank (LR) test, but it provides misleading results in evaluating the crossing survival functions in which the proportional hazards assumption is violated. Therefore, different comparison tests have been proposed. In this study, currently proposed partitioned LR tests and weighted Lin- Wang tests were compared with LR and weighted LR tests. Material and Methods: Type I error rates and powers of comparison tests were compared in different sample sizes and censoring rates using the Monte Carlo simulation technique. The weaknesses and strengths of the comparison tests were examined in various scenarios. In addition to the simulation study, comparison tests were evaluated using open source real-life data set. Results: Simulation results showed that all tests provided reasonable Type I error rates. The most successful results in the scenarios of crossing survival functions belonged to partitioned LR tests. It was observed that the location of the crossing point affected the performance of the tests adversely. Conclusion: Proportional hazards assumption should be tested before comparing two survival functions. It is recommended to use the LR test, when the proportional hazards assumption is provided and the use of partitioned LR tests in the comparison of crossing survival functions.
Anahtar Kelime:

Kesişen İki Yaşam Fonksiyonu İçin Kullanılan İstatistiksel Testlerin Karşılaştırılması

Öz:
ÖZET Amaç: İki yaşam fonksiyonunun benzerliğinin araştırılması yaşam analizi çalışmalarında sıklıkla kullanılmaktadır. Literatürde, en çok tercih edilen yöntem log-rank (LR) testidir ancak bu yöntem orantılı hazardlar varsayımının ihlal edildiği kesişen yaşam fonksiyonlarını değerlendirmede yanıltıcı sonuçlar sunmaktadır. Bu nedenle kesişen yaşam fonksiyonlarını değerlendirmek için literatürde farklı karşılaştırma testleri önerilmiştir. Bu çalışmada, literatürde önerilen güncel yöntemlerden parçalanmış LR testleri ve ağırlıklandırılmış Lin-Wang testlerinin, LR ve ağırlıklandırılmış LR testleri ile karşılaştırılması amaçlanmaktadır. Gereç ve Yöntemler: Monte Carlo simülasyon tekniği kullanılarak, karşılaştırma testlerinin Tip I hata oranları ve güçleri, farklı örneklem büyüklükleri ve sansür oranlarında karşılaştırıldı. Karşılaştırma testlerinin zayıf ve güçlü yönleri çeşitli senaryolarda incelendi. Simülasyon çalışmasına ek olarak, karşılaştırma testleri gerçek hayattaki bir veri seti üzerinde değerlendirildi. Bulgular: Simülasyon sonuçları, tüm testlerin makul Tip I hata oranları sağladığını gösterdi. Kesişen yaşam fonksiyonlarına ait senaryolarda en başarılı sonuçlar parçalanmış LR testlerine aitti. Kesişme noktasının konumunun, karşılaştırma testlerinin performansını olumsuz yönde etkilediği gözlendi. Sonuç: Orantılı hazardlar varsayımı, 2 yaşam fonksiyonu karşılaştırılmadan önce test edilmelidir. Orantılı hazardlar varsayımı sağlandığında LR testinin, kesişen yaşam fonksiyonlarının karşılaştırılmasında ise parçalanmış LR testlerinin kullanılması önerilmektedir.
Anahtar Kelime:

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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APA ÖZEN H, BAL C, ÇOLAK E (2021). Comparison of the Statistical Tests for Two Crossing Survival Functions. , 13 - 27. 10.5336/biostatic.2020-80208
Chicago ÖZEN Hülya,BAL Cengiz,ÇOLAK Ertuğrul Comparison of the Statistical Tests for Two Crossing Survival Functions. (2021): 13 - 27. 10.5336/biostatic.2020-80208
MLA ÖZEN Hülya,BAL Cengiz,ÇOLAK Ertuğrul Comparison of the Statistical Tests for Two Crossing Survival Functions. , 2021, ss.13 - 27. 10.5336/biostatic.2020-80208
AMA ÖZEN H,BAL C,ÇOLAK E Comparison of the Statistical Tests for Two Crossing Survival Functions. . 2021; 13 - 27. 10.5336/biostatic.2020-80208
Vancouver ÖZEN H,BAL C,ÇOLAK E Comparison of the Statistical Tests for Two Crossing Survival Functions. . 2021; 13 - 27. 10.5336/biostatic.2020-80208
IEEE ÖZEN H,BAL C,ÇOLAK E "Comparison of the Statistical Tests for Two Crossing Survival Functions." , ss.13 - 27, 2021. 10.5336/biostatic.2020-80208
ISNAD ÖZEN, Hülya vd. "Comparison of the Statistical Tests for Two Crossing Survival Functions". (2021), 13-27. https://doi.org/10.5336/biostatic.2020-80208
APA ÖZEN H, BAL C, ÇOLAK E (2021). Comparison of the Statistical Tests for Two Crossing Survival Functions. Türkiye Klinikleri Biyoistatistik Dergisi, 13(1), 13 - 27. 10.5336/biostatic.2020-80208
Chicago ÖZEN Hülya,BAL Cengiz,ÇOLAK Ertuğrul Comparison of the Statistical Tests for Two Crossing Survival Functions. Türkiye Klinikleri Biyoistatistik Dergisi 13, no.1 (2021): 13 - 27. 10.5336/biostatic.2020-80208
MLA ÖZEN Hülya,BAL Cengiz,ÇOLAK Ertuğrul Comparison of the Statistical Tests for Two Crossing Survival Functions. Türkiye Klinikleri Biyoistatistik Dergisi, vol.13, no.1, 2021, ss.13 - 27. 10.5336/biostatic.2020-80208
AMA ÖZEN H,BAL C,ÇOLAK E Comparison of the Statistical Tests for Two Crossing Survival Functions. Türkiye Klinikleri Biyoistatistik Dergisi. 2021; 13(1): 13 - 27. 10.5336/biostatic.2020-80208
Vancouver ÖZEN H,BAL C,ÇOLAK E Comparison of the Statistical Tests for Two Crossing Survival Functions. Türkiye Klinikleri Biyoistatistik Dergisi. 2021; 13(1): 13 - 27. 10.5336/biostatic.2020-80208
IEEE ÖZEN H,BAL C,ÇOLAK E "Comparison of the Statistical Tests for Two Crossing Survival Functions." Türkiye Klinikleri Biyoistatistik Dergisi, 13, ss.13 - 27, 2021. 10.5336/biostatic.2020-80208
ISNAD ÖZEN, Hülya vd. "Comparison of the Statistical Tests for Two Crossing Survival Functions". Türkiye Klinikleri Biyoistatistik Dergisi 13/1 (2021), 13-27. https://doi.org/10.5336/biostatic.2020-80208