Global management market of courses & marketing to improve quality in Pt Treatment or science or mainly Bureaucracy?

12 October 2020 9,272 1 View

SEM: What does CFI = 1 & RMSEA = 0 indicate in over-identified models?

I'm suspicious about "perfect fit" in my SEM path analysis, with fit indices of CFI = 1 and RMSEA = 0 which I would expect from an just-identified model. However, since I have 3 degrees of...

08 August 2020 1,492 4 View

Data on most frequently researched KSAOs or personality traits?

I'm looking for meta analyses or reviews, summarizing which knowledge, skills, abilities and other characteristics (KSAOs, especially personality traits) are most frequently researched in...

22 May 2020 332 1 View

AC/DC inverters: Are there any standards or laws regulation DC output on the AC Grid?

Hi, we are working on internal specifications on On-Board Charger for Battery electric vehicles. We have seen some field failures on older generations. We are suspecting that e.g. PV AC/DC...

15 December 2019 6,887 1 View

How to test unidimensionality for polytomous data with IRT-models in R?

I would be thankful if someone could give me a short breakdown on how to test unidimensionality of polytomous data (likert-scale) using IRT-models in R. As it is my understanding that the...

22 November 2019 6,730 7 View

How do you optimize your research design for questionnaires with large item pools?

While developing a questionnaire to measure several personality traits in a somewhat unconventional way, I now seem to be facing a dilemma due to the size of my item pool. The questionnaire...

30 May 2019 2,633 4 View

What factors generally improve inter-rater reliability?

I'm developing a questionnaire to assess observational data in an area of research which is notoriously prone to low inter-rater reliability. Hence, I'm looking for factors in questionnaire design...

03 December 2018 4,006 3 View

Machine learning in economic research?

What is your take on machine learning as an applied method in economic research. is it a game changer or will it not impact your approach to research?

22 July 2018 7,401 5 View

Is there any way to statistically test control samples with parent material?

I want to statistically test the relative gene expression of precision cut liver slices with the gene expression of their parent livers. I have 14 samples from 3 different parent livers that I...

09 March 2018 4,517 4 View

What is the average magnitude of correlations between common personnel selection methods?

Looking for recent (preferably meta-analytic) findings that yielded estimates of the proportion of shared variance among common personnel selection methods such as structured and unstructured...

11 December 2017 1,946 3 View

Abaqus, how can I add a composite layup to a complex shape?

I am designing a knee simulation focusing on the meniscus. I want to add different material layers to the meniscus. I have tried to add composite layup to the menisci in a uniform way but the...

27 January 2021 4,998 1 View

Testing of Antennas?

So, I came across, where antennas are being tested in a building ( a plant), where all sorts of big equipment are around and of course the ceiling. lot of multipath which can affect the...

21 January 2021 9,437 3 View

What are the reasons of asymmetrical bilateral knee Osteoarthritis (OA)?

Primary osteoarthritis - is degenerative joint disease without any apparent underlying cause then what are the reasons of asymmetrical bilateral Knee OA?

09 January 2021 7,524 8 View

How to estimate total electron content using GPS data (with MATLAB)?

06 January 2021 1,110 2 View

Either SEM analysis are enough to justify the morphology and micro structure of activated carbons? or I should go for TEM analysis as well?

While I was discussing my nitrogen adsorption isotherms in the context of micropore, mesopores, total pore volume for activated carbon samples prepared from waste materials, I received a review...

13 November 2020 1,971 3 View

How to isolate RNA from guinea pig cartilage and synovium?

I've been trying to isolate total RNA from guinea pig's knee cartilage. I've tried Qiagen RNeasy kit, miRNeasy kit, trizol method with lots of modifications and have also used the RNaqueous total...

06 November 2020 4,324 1 View

How is theoretical proportion of the total organic carbon of PLA (polylacitc acid) ?

Dear Sirs, I have measured the proportion of the total organic carbon (TOC) of polylactic acid (PLA) method DIN 19539. The results are 35,1%. Is it correct? How is the theoretical proportion of...

04 November 2020 6,598 1 View

What is your experience with coated Total Knee Arthroplasty (TKA)?

We recently analyzed coated Total Knee Arthroplasty (TKA) in the German Arthroplasty Registry for periprosthetic joint infection (PJI). We could not show any advantage of coating in terms of PJI....

02 October 2020 4,107 3 View

How can I determine the type of my membrane NF or UF?

20 September 2020 5,531 2 View

How can you prepare rats synovium of knee joint for histopathology, H and E and special stains?

Tissue processing techniques in particular..

06 September 2020 5,701 3 View