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Questions related from Mohamed I. Riffi
Shrinkage methods are used in machine learning to select features and classify them. These methods are also referred to as methods of regularization regression. They include, ridge, lasso, and...
07 July 2019 2,952 2 View
LASSO ( Least Absolute Shrinkage and Selection Operator) is a regularization method used in logistic regression to select the related features of a high-dimensional gene expression data sets....
05 May 2019 2,484 3 View
Dear Colleagues, I am trying to use some results on m-spacings of the gamma (and exponential) distributions on the reliability of the k-out-of-n systems. I found a way to describe the life time...
01 January 2019 8,279 4 View
Some people consider mathematical axioms as points of strength of mathematics, other say that axioms are points of weakness. My question is why?! Is it so difficult to prove mathematical axioms?
12 December 2018 4,618 15 View
I am looking for recent subjects in the area of using Markov chains in queueing models or theory for the thesis of a master student in mathematics. Thanks a lot in advance. Mohamed I Riffi
02 February 2018 6,480 5 View
I wounder if any one can enlighten me on the possibility of getting support for a mathematics research I am working on. Thanks so much in advance for your help. Mohamed I. Riffi
12 December 2017 4,196 4 View
Most of statistics textbooks approximate the binomial probabilities by the normal probabilities when testing binomial hypothesis especially when the sample size n is large enough. Now, since we...
10 October 2017 4,640 5 View
This Fall, I am teaching my master students an introductory course on Markov chains. I am looking for an easy/clear method to explain the theoretical basis of simulating a Markov chain; i.e.;...
10 October 2017 6,269 8 View
What do you do when you and your colleague in RG agree to write a research paper and provide him with your ideas and some proofs and then he decided is to write the paper alone and to publish it...
07 July 2017 5,294 6 View
Suppose that an urn contains r red balls and w white balls. If n balls are removed from the urn without noticing their colors, then the probability, p, of drawing a red ball from the remaining...
06 June 2017 7,381 5 View
Let X1, X2, ..., Xn be a random sample of size n for the standard exponential distribution and X1:n, X2:n, ..., Xi:n be the corresponding order statistics, where X1:n
05 May 2017 9,845 11 View
Dear Colleagues, Suppose that you have a random sample of size n from the set of positive integers. Some of the elements of this random sample will be prime numbers. Determine the positions of...
01 January 1970 8,094 8 View