If the reader wants to know the details of FuzzyCDF, please refer to the Chapter 4 of the paper: Fuzzy Cognitive Diagnosis for Modelling Examinee Performance.
@article{liu2018fuzzy,
title={Fuzzy cognitive diagnosis for modelling examinee performance},
author={Liu, Qi and Wu, Runze and Chen, Enhong and Xu, Guandong and Su, Yu and Chen, Zhigang and Hu, Guoping},
journal={ACM Transactions on Intelligent Systems and Technology (TIST)},
volume={9},
number={4},
pages={1--26},
year={2018},
publisher={ACM New York, NY, USA}
}