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Titolo: SURVIVAL ANALYSIS  THE IMPORTANCE OF CENSORED OBSERVATIONS
Autore: WATT DC; AITCHISON TC; MACKIE RM; SIREL JM;
 Indirizzi:
 UNIV GLASGOW,DEPT STAT,MATH BLDG GLASGOW G12 8QQ LANARK SCOTLAND
 Titolo Testata:
 Melanoma research
fascicolo: 5,
volume: 6,
anno: 1996,
pagine: 379  385
 SICI:
 09608931(1996)6:5<379:SATIO>2.0.ZU;29
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 PREDICTING SURVIVAL; MALIGNANTMELANOMA; TUMOR PROGRESSION; PROGNOSTIC MODELS; VALIDATION; MORTALITY;
 Keywords:
 CENSORED OBSERVATIONS; KAPLANMEIER; PREDICTION; SURVIVAL ANALYSIS;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Science Citation Index Expanded
 Citazioni:
 17
 Recensione:
 Indirizzi per estratti:



 Citazione:
 D.C. Watt et al., "SURVIVAL ANALYSIS  THE IMPORTANCE OF CENSORED OBSERVATIONS", Melanoma research, 6(5), 1996, pp. 379385
Abstract
We have considered the issue of predicting from diagnosis of a condition such as malignant melanoma survival past an often arbitrarily chosen fixed timepoint, such as 5 years. Prediction of survival past any timepoint becomes rather complicated due to the presence of 'censoredobservations', and these observations are often ignored in any analysis. Censored observations are subjects who either die of causes other than the disease of interest or are lost to followup. The aim of thispaper is to show that the result of ignoring these 'censored observations' is an underestimation of the probability of survival beyond the fixed timepoint. Ignoring these censored observations results in potentially valuable information on survival being thrown away. This underestimation will often prove to be of considerable magnitude and dependent on the proportion of censored observations present in the data. Itis therefore essential to carry out a full actuarial survival analysis which will incorporate all the information contained in these censored observations.
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Documento generato il 28/11/20 alle ore 22:03:02