What are the most popular shrinkage methods?

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...

06 July 2019 2,872 2 View

In LASSO, do the selected features differ from one round of implementation to another?

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....

04 May 2019 2,419 3 View

Where can I find information about the k-out-of-n systems and their reliability?

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...

31 December 2018 8,207 4 View

Is the use of mathematical axioms good or bad in mathematics? Is it difficult to prove axioms?

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?

11 December 2018 4,547 15 View

Where one can find fund for his/her mathematics research?

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

11 December 2017 4,131 4 View

How to simulate a Markov Chain?

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.;...

09 October 2017 6,180 8 View

Do we really need to use the normal approximation to the binomial probabilities when testing statistical hypothesis?

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...

09 October 2017 4,569 5 View

What would you do if you and your colleague agree to coauthor a paper and then he decides to write the paper alone and to publish it under his name?

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...

06 July 2017 5,227 6 View

How can one describe the follwing conditional probability?

05 June 2017 7,309 5 View

What's wrong with the computation of the probability that the exponential spacing Dn becomes less than t>0 for the first time?

04 May 2017 9,773 11 View

Binary Logistic Generalized Linear Mixed model in SPSS. Is it doable?

I want to analyses the proportion of swimming sperm of three species of fish in two salinities. To analyse the proportion of swimming sperm in a Generalized Linear Model, I would use a Binary...

03 March 2021 2,297 3 View

Could you recommend any books about Number Theory?

Beginner level books. High level books. Analytical Number Theory. Algebraic Number Theory. Combinatorical Number Theory. Books about partitions. Books about primes.

03 March 2021 7,174 5 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 1 View

What is Flat Lens Antenna?

28 February 2021 5,433 3 View

How can we simulate an hyperelastic-viscoelastic behavor with Ansys APDL?

I am working on modeling and simulation of biomecanical material behaviour, I have succeded on simulating skin using anisotropic hyperelastic material, on APDL and in our lab's finite element...

28 February 2021 552 3 View

Can impedance of antenna be less than 50 ohms?

I am simulating helix antenna in hfss, right now, giving excitation with 50 ohms port. When I see the results of Z parameter (real). It shows lower than 50 ohms. Do not understand, if it can be...

27 February 2021 4,218 7 View

What are the application of Fixed points thoery in Chemistry.?

It is said that fixed point theory has lot of applications not in the field of mathematics only but also in various areas. So I am looking for applications in Chemistry only..

26 February 2021 3,533 1 View

How to interpolate from a time-series database ?

Hi, I am having trouble with a problem, in the field of Optimal Control and the generation of optimal time-series. Let's consider a system, whose dynamics are represented by dx/dt =...

24 February 2021 9,105 2 View