I am trying to figure out which approach I should use to plot the KM Survival estimator. I am referring to different resources. One from the Survival Analysis Course provided through Coursera and another through a tutorial provided via KDD. https://www.researchgate.net/publication/319151424_Machine_Learning_for_Survival_Analysis_A_Survey

I have attached the file capture with the data I am working on and I would like to understand whether I am doing it correctly. I am trying to plot the survival probability for the population and it is similar to the approach used in the Coursera module on Life Tables. But I noticed that the formula used to calculate the proportions of patients surviving past time t seems to give the same results as the S(t) formula given in the KDD tutorial. So I am now not very sure if this S(t) formula is to calculate the proportion of subjects surviving past time t or for the probability of survival because the formula used to calculate the latter seems to be different if I use the approach taught in the Survival Analysis course. My data consist of subjects that have left the study in between and also at two time points, new subjects entered the study.

I also wish to know if it is really necessary to display the KM estimator chart using the steps or is it acceptable to plot it as how I have done it in the attached file.

Thank you and look forward to get some advice on this.

I have attached the file capture with the data I am working on and I would like to understand whether I am doing it correctly. I am trying to plot the survival probability for the population and it is similar to the approach used in the Coursera module on Life Tables. But I noticed that the formula used to calculate the proportions of patients surviving past time t seems to give the same results as the S(t) formula given in the KDD tutorial. So I am now not very sure if this S(t) formula is to calculate the proportion of subjects surviving past time t or for the probability of survival because the formula used to calculate the latter seems to be different if I use the approach taught in the Survival Analysis course. My data consist of subjects that have left the study in between and also at two time points, new subjects entered the study.

I also wish to know if it is really necessary to display the KM estimator chart using the steps or is it acceptable to plot it as how I have done it in the attached file.

Thank you and look forward to get some advice on this.

Last edited: