What is Tobit Multiplicative Heteroscedasticity Regression?

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How can I apply modified poisson regression on stata?

Currently, I'm working with cohort study that has binary outcome. I read differnt literatures regarding the regression approches to determine relative risk for binary outcomes, use of the...

06 December 2022 2,331 1 View

How radon22 radioactive and stable isotope of water tracers can quantify groundwater recharge and discharge in semi-arid areas?

The use of environmental tracers that are relevant for groundwater and surface water interactions constitutes a powerful tool for understanding the source, flow and mixing dynamics of water...

03 January 2022 1,124 3 View

Any body who can share me the standard row data for JCPDS card no. 00-049-1642 and 00-048-1548 is highly appreciated .?

I have synthesized Zirconia and copper oxide metal oxides whose JCPDS card no is indicated here. But I need the standard data for these metal oxides or JCPDS card no. 00-049-1642 and 00-048-1548.

09 November 2021 2,440 2 View

Why logarithmic transformation in regression analysis? What are the merits and demerits of logarithmic transformation?

Logarithmic transformation is used as a convenient means of transforming a highly skewed variables into a more normalized dataset. In addition, the log transformation can decrease the variability...

26 June 2021 6,662 7 View

What is the difference between research gap and problem statement in academic studies?

Often postgraduate students are confused about the difference between the research gap and problem statement. Please discuss.

05 August 2020 5,010 2 View

What factor will change hesteresis curve ?

What are the factor that change the shape of force versus displacement curve? In my validation process of wall to beam connection the force is ok but its respective displacement is small as...

03 August 2020 1,051 0 View

How can i model jacking force that applied in tendons?

i try to model post-tensioned tendons and i have a problem how can i model initial stress that is applied by jacking

30 January 2020 2,253 0 View

Help on modeling unbounded post-tensioned tendon and it's end anchorage with ABAQUS 6.13 ?

i tries to model unbounded post-tensioned tendons with abaqus 6.13. i need any vidios or verification. thanks all....

27 January 2020 6,629 3 View

How can he find the raw data for sample size calculation for a cohort study?

Hello there, how are you? I do have a friend working a clinical Nutrition research which is rare to our country and specifically localized to Neonatal ICU. There are a few articles which is...

07 March 2019 1,218 1 View

Bservation when sample of a fiber made of polyvinyl alcohol on one end in a beaker of water but one end of the fiber dissolves .Why?

Explain why the below phenomenon occurs: You have a sample of a fiber made of polyvinyl alcohol. To one end of the fiber, you tie a weight of 200 grams. Now you immerse the end tied to the weight...

24 January 2019 5,825 1 View

How can I prepare virus for a TEM or SEM imaging?

I have virus (viral hemorrhagic septicemia virus) in suspension and the experiment will not involve cells. What level of TCID50 is preferred?

11 August 2024 3,115 1 View

Handling Missing Data and Building a Predictive Model with Incomplete Information ?

I am developing a predictive model for a water supply network that involves 20 influencing points. However, I only have historical data for 10 out of these 20 points. I would like to know how to...

10 August 2024 4,005 2 View

Is it possible to use the Fused Deposition Modeling (FDM) to additively manufacture interconnected porous structure generation of >100-200 micrometer?

Usually, additive manufacturing techniques like SEBM, SLS, and SLM are used for interconnected porous lattice structure generation with sizes of >100–200 micrometers. Can the Fused Deposition...

09 August 2024 7,892 0 View

How to define an anisotropic material with asymmetric elastic compliance/stiffness matrix in ANSYS APDL?

I need to model an anisotropic material in which the Poisson's ratio ν_12 ≠ ν_21 and so on. Therefore, the elastic compliance matrix wouldn't be a symmetric one. In ANSYS APDL, for TB,ANEL...

09 August 2024 5,048 2 View

How can I apply boundary conditions in an orthotropic steel deck numerical model using ABAQUS software?

I am trying to simulate vehicular loading on an orthotopic steel deck bridge section in ABAQUS software. The red arrow mark in the attached figure indicates the direction in which the vehicle will...

08 August 2024 719 0 View

Can you suggest reliable sources defining "3D mesh" and "3D city models"?

Dear fellow researchers, I am currently working on a paper where I need to provide a reliable reference that defines and distinguishes between 3D mesh models and 3D city models. Although I am...

06 August 2024 9,986 2 View

Is there an alternative to a multinomial regression which allows the DV to be non mutually exclusive?

I am trying to analyse data from a survey examining what variables affect teachers perceived barriers to incorporating technology into their classroom. I have 5 predictor variables however my DV...

06 August 2024 1,752 3 View

In order to run Multinomial Logistic Regression, is it required that the data be in the long format?

I am using unit level data (IHDS round 2) & Stata 17

06 August 2024 5,725 2 View

Please explain how the plastic input value should be considered from the true stress-strain curve for the bilinear elastoplastic material model ?

I am working on Abaqus/Explicit(Quasistatic ) for the deformation of the auxetic structure model. Please explain how the plastic input value should be considered from the true stress-strain curve...

05 August 2024 454 3 View

What are the shear and normal stiffness values of an LLDPE liner in 3D numerical modeling of a stockpile?

I am seeking experimental or applicable data for the liner (LLDPE) interface in FLAC3D numerical modeling of a large stockpile. Could you please recommend suitable references? The preferred data...

05 August 2024 3,665 0 View

Jonas Poufoun Ngouhouo

I don't really know, but I faced this issue of inconsistencies of the Tobit under heteroscedasticity in one of my papers. But as the observations I used had a non negligeable share of 0 (Corner solution outcomes), I used a Cragg’s Heterroscadastic Double Hurdle Model to overcome both deficiencies.

Meriam Chuhdary

Mr. Jonas Poufoun Ngouhouo, can you please explain this model?