Anyone familiar with random variable characteristic series?

Suppose f(x) is a probability distribution of a random variable X, where x is real. We may calculate the Fourier transform of f(x) and this way obtain the so-called characteristic function of...

09 October 2015 9,571 6 View

Can anyone help with variance for combined probabilities?

Suppose that we are given two probability density functions. f(x) with mean 0 and variance sf2 g(x) with mean 0 and variance sg2 Let h(x) = N sqrt( f(x) g(x) ), where N is the normalization...

02 March 2014 4,141 7 View

Is there a description of a "Formula stable" probability distribution?

According to E. Lukacs, "Characteristic functions", 2nd ed., we say that F(x) is a stable probability distribution if for all b1,b2>0 and all real c1,c2 we can find b>0 and real c such that: F(...

11 December 2013 2,034 16 View

Invalid assumption of RVs independence and still good results?

In this paper: http://dx.doi.org/10.1007/s00034-013-9622-3, right before expression (24) I have adopted an evidently false assumption about independence of random variables x_0 and w(iT); but the...

10 November 2013 9,002 0 View

Are there any benefits from output settling in DACs?

Is there known any case in which non-instant output settling of a digital-to-analog converter is preferable? Ideally, the output of DAC is a step function, with immediate transitions. Perhaps if...

10 November 2013 9,454 4 View

Do you know any statistical models for OFDM alternative to Gaussian?

Typically, the probability of OFDM signal having a particular value is assumed to be given by normal distribution (i.e. Gaussian). Do you know any alternative models?

10 November 2013 7,158 4 View

Is there known any generalization of characteristic function?

Characteristic function of a random variable X is defined as E[exp(itx)]. It has been studied a lot and a number of its useful properties are known. Is there known any "generalization" of...

10 November 2013 9,537 6 View

How to find a random variable for given probability distribution defined in terms of distributions of other random variables?

Suppose that X1, X2 are random variables with given probability distributions fx1(x), fx2(x). Let fy(x) = fy( fx1(x) , fx2(x) ) be a known probability distribution of "unknown" random variable Y....

09 October 2013 7,915 4 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View