1 citations · 1 across the 3 of their papers we have counts for
6 papers
One Goodness-of-Fit Test Is Not Enough: Error-Controlled Localization of Misfit in Logistic Risk Models
Ebrahim Khaled Ebrahim, Ahmed El-Kotory, Osama Abd El-Aziz Hussein
A goodness-of-fit test tells whether a logistic risk model fits, but the analyst also needs to know what is wrong: an overall risk that is too high is repaired by updating the inte…
Foundation or Formula? A Simulation-Based Comparison of Google's TimesFM-3 and Classical Time-Series Models
Ebrahim Khaled Ebrahim, Somaia Mohamed Ali, Ahmed El-Kotory
Time-series foundation models such as Google's TimesFM-3 forecast series they were never trained on, but whether they should replace classical methods such as ARIMA and exponential…
Three-group variance-ratio tests for heteroscedasticity in linear regression: an exact null distribution and an outlier-resistant version
Ahmed El-Kotory, Ebrahim Khaled Ebrahim
Tests for heteroscedasticity in linear regression lose their level or power in three situations: when the data contain outliers, when the variance is not monotone, and when it chan…
[EDGE] A grouped calibration test for logistic regression that tolerates a few corrupted records
Ebrahim Khaled Ebrahim, Ahmed El-Kotory, Osama Abd El-Aziz Hussein
The Hosmer-Lemeshow calibration test groups patients by predicted risk for a valid reference and loses power that more groups cannot recover. Later tests weight each record's resid…
Benchmarking Goodness-of-Fit and Calibration Algorithms for Logistic Regression Classifiers: A Large-Scale Simulation Study under Sparse Data
Ebrahim Khaled Ebrahim, Ahmed El-Kotory
Binary logistic regression is among the most widely used classification algorithms, yet a classifier is only trustworthy if its predicted probabilities are well calibrated. The cla…
A modified Hosmer-Lemeshow goodness-of-fit test for asymmetric links: second-order power and robustness
Ebrahim Khaled Ebrahim, Ahmed El-Kotory, Ibrahim Galal Khattab
The Hosmer-Lemeshow test is the routine check of fit for logistic regression, yet it is weak against a wrong link, and the directed tests that are stronger lose their level when a…