Questions tagged [risk]

Risk has several meanings in different contexts within statistics

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How to model data where an individual could be in more than one group within the data, but is more likely to only appear once?

I have multiple cohorts of patients with different index symptoms/events, and am looking to predict cancer risk for each separate cohort, including certain covariates of interest to see which ...
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1 vote
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Calibration plot in survival analysis

I'm trying to evaluate my parametric proportional hazards and accelerated failure models in terms of calibration. There seem to be many ways to summarise calibration, but they give a single summary ...
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Different absolute risks

There are two absolute risks at one year after either initiating drug A or drug B regarding a disease. Drug A: 2,3% (2,1% - 2,7%) Drug B: 1,4% (1,0% - 1,8%) Could one say that risk using drug B is ...
• 171
1 vote
26 views

Defining two thresholds in a binary classification model

In the context of binary classification, models usually output probability values ranging from $0$ to $1$, and then use a default threshold of $0.5$ to decide wether to classify an observation in one ...
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Are diagnostic tests and clinical (risk) prediction models in medicine essentially the same thing?

In medicine, are diagnostic tests (e.g. covid test, HIV test, ...) and risk prediction models essentially the same thing? If not, in which aspects do they differ (from statistical point of view)? ...
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Doubt regarding limiting distribution on Vasicek model

I was reading an article from Vasicek where he's concerned about deriving the limiting loss probability distribution on a credit risk model with 2 factors. I am here presenting a somewhat different ...
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Convert Multivariate PDF to Anomaly based Risk Score on scale 0 to 1

I have defined a multi-variate normal distribution over a number of risk factors. Currently the PDF over the risk factor observations ranges from infinitesimally values to a maximum of ~2.1. While the ...
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Return period of vine copula

In the formula for "OR" joint return period of 3-dimensional copula modeling, we need to find C(u,v,w) but when we model using vine, we are only able to obtain the copula C(uv|w). So, how to ...
60 views

Value at Risk / Tail Value at Risk

Question: Let X be a random variable with the following loss distribution k Pk 0 0.50 1000 0.30 2000 0.10 5000 0.06 10000 0.04 – Calculate 95% ...
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Infimum of a set - Value at Risk

I don't understand these semantics. Can somebody tell me with easy words and some other examples how to understand this last equation and why it equals 0? How to understand this colon after variable '...
85 views

Difference between generalisation error (Vapnik risk) and frequentist (statistical) risk

I'm reading these lecture notes: http://www.iro.umontreal.ca/~slacoste/teaching/ift6269/A19/notes/lecture5.pdf I always learned: "risk is the expected loss". In these lecture notes I see two ...
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1 vote
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Combining hazard ratios

I was wondering if someone could help me with a doubt about hazard ratios (HR). I have access to a publication reporting HR of death given exposure A obtained through Cox regression. Reported HRs are ...
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