There are multiple definitions:

1. kernel density estimate(English)

   • the application of kernel smoothing for probability density estimation, i.e., a non-parametric method to estimate the probability density function of a random variable based on kernels as weights
   • AMISE, MISE, PKDE
   • Statistics, Signal analysis
   • https://mathiso….github.io/kde/
   • https://doi.org…OC.2021.3052449

2. kappa deleting element(English)

   • DNA, RS
   • Hematology
   • https://doi.org…3/nar/15.6.2699