Is there a (dis-)advantage in dicotomizing Likert data?

Given there is some k-step (k=3 or 5 or 7 etc) Likert data with "absolutely no" on one side, "absolutely yes" on the other side, and "neutral" in the middle. A correct way to analyze such...

07 August 2020 1,107 5 View

Is it correct to call lo(w)ess "non-parametric"?

It's a weighted least-squares polynomial regression, so it's based on assuming normal errors, and the normal probability model is parametric. However, in some statistics book and online statistics...

28 October 2018 2,985 6 View

Patlak slopes from dynamic PET data with delayed begin of acquisition?

I'm currently working with pesudo-dynamic PET scans, i.e. data containing sequentially acquired time frames. Using all the time frames I can 'easily' compute the Ki-values (slopes of the...

11 August 2016 4,566 1 View

Are these models equivalent?

27 January 2016 410 7 View

How to calculate the sample size (t-test) when additional data is available to estimate the standard error?

Consider following case: There are k different groups, but only the mean difference between 2 of these groups should be tested (t-test, consider the assumptions are met and alpha and beta are...

14 October 2015 7,922 11 View

No title

Bernhard of Chartres says in his Glosses on Plato, that such an ideal state cannot exist in this world. Is this now his own opinion, or does he refer to Republic IX 592ab? Because: As far as I...

04 December 2014 2,696 3 View

Could optogenetics provide a new interface between electronics and biological nervous systems?

The control of robotic prosthesis via signals from the nervous system has reached an impressive level in recent years. However, the feedback of signals from the prosthesis back into the nervous...

18 May 2014 8,935 7 View

Least-squares only for normal distributed errors - can anyone help?

A parameter of a statistical model should be estimated from iid data. For simplicity, let's consider a single-parameter model. The likelihood principle sais that the best estimate for the...

18 March 2014 4,717 56 View

Deviance as -2*log(LR): why -2?

I tried to find out why the deviance in GLMs is defined as -2*log(LR) (with LR being the likelihood ratio). Why the factor -2? Often, authors state that this way the deviance for a normal model...

28 April 2013 1,813 3 View

Precision of the estimate of a proportion

Background: From a binomial experiment (k successes in n trials), the proportion of successes in the "population" is estimated by p = k/n. This estimate has a standard error of SE =...

14 February 2013 3,748 9 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

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

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 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

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View