Statistical Analysis Stack Exchange
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Questions tagged [kaplan-meier]

The Kaplan-Meier estimator is a common non-parametric method for survival analysis and for plotting survival graphs. The survival function $S(t)$ calculates the probability of survival past time $t$. It is most useful in comparing the survival of different groups while properly handling censored data.

The Kaplan-Meier estimator is a common non-parametric method for survival analysis and for plotting survival graphs. The survival function $S(t)$ calculates the probability of survival past time $t$. It is most useful in comparing the survival of different groups while properly handling censored data. It is not well suited for estimating survival adjusted for covariates. In such a case, it is better to use other parametric or semi-parametric models, such as the Cox Proportional Hazards model.

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Deriving the Kaplan-Meier estimator with right-censoring

Let $\lambda_j$ be the hazard function for time $t_j$, where $j\in\{1, 2, \ldots, J\}$, and let $d_j, c_j$, and $n_j$ represent the number of "deaths", the number censored, and the number at risk at time $t_j$ respectively. Essentially, this is the…
Alex Richter
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Seeking Advice on Combining Kaplan-Meier Curves with Different Observation Periods and Extrapolation

I hope this message finds you well. I am currently working on a research project involving the comparison of Kaplan-Meier curves from clinical trials with different observation periods. The challenge I'm facing is that the trials have varying…
bitmarks
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will one treatment have an unfair advantage in my Kaplan-Meier comparison?

My data on cancer patients spreads over 18 years. The first nine years the patients are diagnosed with a CT scan. Then PETCT becomes approved. I want to do a survival analysis(Kaplan-Meier) and a comparison of the two different treatments. The event…
flutter
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Kaplan-Meier Subsetting/Selecting Strata for Comparison

When comparing different strata how legitimate is it to merge or eliminate single strata, especially if they represent an intermediate level in order to provide a comparison. Each strata relate to three locations along a bone - distal, middle,…
Cenoc
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Should we freeze the number of people coming in to the study for Kaplan-Meier test

I'm conducting a Kaplan Meier study to determine user retention for a website. I'm planning to limit my timeline to 6 months and see how many users are dropping within that time period. And if a user does not have any action for a month I'm…
DINESHKUMAR MURUGAN
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Kaplan-Meier for repeated measures in different exercise conditions

newbie here with a question: I have a study in 40 subjects (similar amount young vs old) testing time to muscle fatigue (meaning no longer able to perform the task); each subjects performed this test at 60, 80 and 100% of muscle power, with varying…
JVDW
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Comparison Kaplan Meier survival across different time periods

I am familiar with the log-rank test for comparing multiple Kaplan-Meier curves, but I am looking for a test that will show a trend between groups. Lets say the groups are patients seen at different time periods (A 2000-2005; B 2005-2010; C…
Kweetvannix
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Kaplan-Meier curve: Subjects with multiple follow up and event status

I would like to create a K-M curve for my data. My confusion is, I have some patients with multiple observed times and event status (see pic). Events under the same patients are independent. Would it be reasonable to create a K-M plot for all…
curiousmind
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