Book on Multilevel Modeling

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STATA command for scatterplot with linear fit line for subgroups?

I have three variables: sbp, age and sex. I want to make a scatterplot for the relationship between sbp and age (both continuous variables) for sex groups (male and female). What would be the...

06 July 2018 4,935 2 View

How do I compare change in a function measured using two different scales?

I am measuring lung function using FEV1 (%) and CT score (range 0-30) in 20 patients at time 0 and at one year of follow up. How should I test which of the two measures (FEV1% or CT Score) shows...

06 July 2017 9,353 4 View

How can I assess diagnostic accuracy for an ordinal outcome?

I am evaluating an outcome which is an ordinal variable with 5 levels. I am measuring this outcome with a 'gold standard technique' and two other non-invasive techniques in 30 patients. I want to...

07 August 2015 2,516 7 View

How can I analyze a three by four factorial design with a categorical dichotomous outcome?

My experiment involves three groups of patients receiving three different drugs. Each patient in all the three groups is examined at baseline, 2 weeks, 4 weeks and 6 weeks for a categorical...

02 March 2015 9,387 9 View

How do I statistically compare the sensitivity and specificity or LR+ and LR- of three diagnostic tests performed on the same patients?

In my experiment I am subjecting 50 patients to a definitive diagnostic test and three more different tests. How do I statustically test the hypothesis that the sensitivity and specifity or the...

02 March 2015 7,133 22 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

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

What techniques can I use to determine the miscibility of polymer blends?

The term miscibility refers to the single-phase state in thermodynamics. I do not mean the compatibility of different components. To determine the miscibility I know several techniques such as...

03 March 2021 4,107 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 to repeat an operation on an atom selection for multiple times in PyMol?

Hi, I am trying to construct a multi-layer fibril structure from a single layer in PyMol by translating the layer along the fibril axis. For now, I am able to use the Translate command in PyMol...

02 March 2021 4,569 4 View

Shall I skip the measurement model in SmartPLS?

Hello everyone, I had run a mediation model in SmartPLS using questionnaires that were already validated among my statistical population. A professor who edited my paper -though she is not...

01 March 2021 3,052 3 View

What is involved in morphological changes of SEM images of a substance?

In the sem analysis of CaCO3 nanaoparticles, the morphology images showed spherical shaped particles but the proposed morphology for these type of nanoparticles is trigonal. I prepared the...

01 March 2021 1,960 4 View

Joint behaviour in Abaqus is not captured well?

I am working on roof joint and trying to simulate the behaviour in Abaqus. I am successful in running the model but the final graph does not follow the experimental curve in the negative direction...

01 March 2021 6,661 3 View

How to define tie constraint between rigid body and another part in dynamic explicit model of Abaqus?

Hi dear researchers I connected a rigid body into the part of my structure by tie constraint and then I added displacement to rigid body, in static general step every thing is fine and these two...

28 February 2021 3,442 2 View

Does the circuit modeling for planar monopole antennas using Foster canonical forms give good approximation?

Hi researchers, I am searching for some accurate way to do the circuit modeling of planar CPW-fed monopole antennas. I have gone through the literature where mostly circuit modeling is done using...

28 February 2021 7,016 1 View