frailties

n.

脆弱( frailty的名词复数 )；虚弱；（性格或行为上的）弱点；缺点

1. The love stories that touch us most deeply are punctuated by human frailty.
   最深深打动我们的那些爱情故事总是打满了人性脆弱的洞孔。
2. Despite his age and frailty, he did not die.
   尽管他年老虚弱，但他没有死。
3. One of the frailties of human nature is laziness.
   人性的弱点之一是懒惰。

Using Frailties in the Accelerated Failure Time Model
LINES, COMPUTERS, AND HUMAN FRAILTIES*
Bivariate Survival Models Induced by Frailties
Proportional hazards models with frailties and random effects.
Modelling heterogeneities in individual frailties in epidemic models
Multivariate Survival Analysis with Positive Stable Frailties
A Weibull Regression Model with Gamma Frailties for Multivariate Survival Data
Health-care system frailties and public health control of communicable disease on the European Union's new eastern border
Estimation of variance in Cox's regression model with shared gamma frailties.
Multivariate survival models induced by genetic frailties, with application to linkage analysis.