Is there a mathematical proof showing how random assigment guarantees the same probability for the individual to be selected?

Considere a completely randomized design, where every unit is randomly assigned to a treatment group. Let's say we have 30 observations and 3 treatment groups. When we choose one observation at...

09 October 2018 5,011 17 View

Is anyone familiarized with the use of the "Delta method" in the calculation of the SE's of the long run coefficient after estimating an ARDL model?

After estimating an ARDL model in eviews, you can ask for the long run coefficients by clicking view > coefficients diagnostic > long run form and bound test. My question is: how standard...

01 February 2018 9,644 2 View

Why eigenvectors seem incorrect in python?

01 February 2018 5,615 4 View

Should we considere Structural Breaks when testing for granger non causality following Toda - Yamamoto procedure?

Dear Sir or Madam: Should we considere Structural Breaks when testing for granger non causality following Toda - Yamamoto procedure? I mean should i considere breaks in the slope or intercept or...

07 August 2017 1,308 0 View

Should I considere structural breaks in an ARDL model?

Dear Sir or Madam, Is it correct to considerer structural break in the data by adding a Dummy2000 (which adquire values of 1 since the year 2000) and an interaction term, Dummy2000*X1. Y =...

31 December 2016 10,021 7 View

What would you suggest when structural break is present?

Dear Sir or Madam, Your opinion will be highly appreciated! I'm using annual series from 1965 to 2015. Chow test suggest that there is one break date (1980) in my dependent variable (Y). Should I...

11 December 2016 9,423 1 View

Should I fix Multicollinearity or should I leave it?

I would like to read your opinions about the next issue: the model (ARDL) is CO2 emissions (lco2pc) as a function of oil prices (lop) and GDP per capita (lgdppc). All variables in log form.Oil...

11 December 2016 7,545 10 View

Would you prefer Traditinal Granger causality or Toda yamamoto procedure to test for granger causality?

My model is Y(X1,X2), where Y=CO2 emissions, X1 = gdp per capita, X2 = oil prices. When i tested using traditional Granger causality, X1 and X2 do granger cause Y. When i tested for granger...

11 December 2016 1,726 2 View

Is my model still stable?

Dear sir or madam: I was wondering if these results show that my ardl model is stable. I mean if we see the cusum square graph the blue is outside the band and then comeback within the...

10 November 2016 2,571 6 View

What do you do when unit root testing?

Hello! After reading several websites, i still can't be 100% sure when chosing between none, Intercept only, Trend only and both (trend and inercept) for unit root testing. So, i will really...

09 October 2016 3,395 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

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

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View