384231
A kernel smoother is a statistical technique for estimating a real valued function f ( X ) \ , \ , \ left ( X \ in \ mathbb ^ \ right ) by using its noisy observations , when no parametric model for this function is known .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None