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Questions related from Hatem Ali
Dear Colleagues I am trying to do survival analysis model for prediction. My main aim is discrimination I know that harrell c statistic is not time dependent and cannot tell across different...
15 February 2023 3,819 1 View
Dear Colleagues Happy holidays I have done a survival analysis Kaplan meier curves with at risk table reported I have attached the at risk table to this message However, when I calculate...
01 January 1970 8,090 1 View
Dear Colleagues I am struggling to understand stratified cox regression ? In Google it says: The “stratified Cox model” is a modification of the Cox proportional hazards (PH) model that allows...
01 January 1970 7,245 2 View
Hello, I have done a multiple logistic regression to compare low dose versus high dose ATG and it effect on developing PTLD Inthe logistic regression model, the odds ratio was 1.9 which I...
01 January 1970 2,105 4 View
Dear Colleagues I hope all is well. I am doing penalised cox regression in python I have managed to get the coefficients. However, I am struggling to get the confidence interval. I would...
01 January 1970 3,948 8 View
Dear All, I hope all is well. I am trying to do a penalized cox regression analysis in Python. However, in order for the function to work, the "event" and "time" need to be stored as a structured...
01 January 1970 1,425 3 View
Dear Colleagues I found the following link: https://lifelines.readthedocs.io/en/latest/Survival%20Regression.html that gives code for adding Penalties and sparse regression to cox regression...
01 January 1970 4,884 0 View
Dear Team, I found this nice link: https://lifelines.readthedocs.io/en/latest/Compatibility%20with%20scikit-learn.html that ,on python, can do survival analysis using python, and apply lasso...
01 January 1970 6,170 0 View
Dear Collegaues, I hope all is well. Thank you very much for your help I am used to STATA and very new to using R package. STATA has lasso inference for linear and logistic regression. However,...
01 January 1970 188 6 View
Dear Colleagues, I hope all is well. I am sorry for very Naive question as I am very new to using R package. I have imported a dataset from STATA to R package, installed the package for...
01 January 1970 7,577 3 View
Hello Guys, I am trying to do a meta-analysis some studies are mentioning odds ratio with confidence interval while others are converting relative risk with confidence interval So I am trying to...
01 January 1970 4,586 0 View
Dear Colleagues I hope all is well. I have a classification project, the event outcome is imbalanced (25% of the subjects having the event) The data has almost 90 variables that become 250...
01 January 1970 6,502 3 View
I am working on a binary classification task with a pretty straightforward input set of numeric features. One of these features is particularly good, but it cannot be used in real life because...
01 January 1970 5,334 3 View
Hello, I have been trying to apply SMOTE to right censored data How to properly apply SMOTE over-sampling technique on right censored data? I have dataset (210x16) only with around 7%...
01 January 1970 747 0 View
Hello I have some results for a classification model: AUC is 0.56 However, accuracy is 0.9 and specificity is 0.9 I wonder If these are reliable results, given the AUC is just 0.56? Can I...
01 January 1970 569 6 View
Dear Colleagues I hope all is well. I am interested in doing penalized cox regression using PYTHON. I came across the following way to do penalized cox regression: Penalized Cox Models —...
01 January 1970 2,693 4 View
Dear Colleagues I hope all is well. I have done machine learning model for prediction of survival among kidney patients. My boss is keen to do subgroup analysis based on ethnicity to see if our...
01 January 1970 3,491 1 View
Dear Colleagues I came across this paper: "Balanced Random Survival Forests for Extremely Unbalanced, Right Censored Data" I have attached it to this discussion. I am not sure how they did the...
01 January 1970 4,162 0 View
Dear Colleagues I hope all is well. I wonder if you can help me interpreting the integrated brier score In my work , I got integrated brier score of 0.23 My understanding is that 0 means...
01 January 1970 4,770 0 View
Dear All I have a survival data that I divided into training and test dataset. I ran a cox regression model on the training dataset and evaluated the concordance index on the test dataset. The...
01 January 1970 9,598 1 View
