Is there any interaction equivalent of Cochran's Q test (like 2x3 design)?

I have data on the effectiveness of the three treatments: T1, T2 and T3 for each patient. Each variable is coded dichotomously - 0 = drug not working; 1 = drug is working. The patient could feel...

30 November 2020 1,146 14 View

Two pair of peaks of quinone/hydroquinone redox probe on GCe?

Hello, I recently stumbled upon a voltammogram of HQ/Q in 0.1M NaCl on glassy carbon electrode. I was surprised to see two pairs of peaks present on the graph. As far as I know it is a two...

29 June 2020 1,833 2 View

Non-equal variances t-test in SPSS - it's Welch or Cochran-Cox?

Can anyone help me answer the question of whether t test for unequal variances is calculated in SPSS according to Welch or Cochran-Cox correction? Test statistics are the same, they differ only...

29 May 2019 7,445 14 View

Is there any reason why one can not reduce dimensions with PCA/Alpha before putting them into SEM model?

Suppose I have three measurable variables (A, B, C on figure below) and one latent (L) in my SEM model. This one latent one is a construct/dimension consisting of 5 questions from some...

07 April 2019 905 6 View

What is precipitated in buffer solution stored in glass bottle?

Does anyone know what is precipitated in carbonate buffer solution stored in typical amber glass bottle (picture is an attachment)? The carbonate buffer in the bottle is Na2CO3/NaHCO3, pH=10.0...

06 February 2019 7,556 3 View

How many animals are required for experiment?

I want to compare 4 different methods of bladder cancer induction and I have to calculate sample size. How many animals I have to used to get appropriate statistical power?

25 November 2018 151 2 View

How to generate average contact maps from molecular dynamics?

Hi, I am looking for a way to generate a contact map between each residue of a protein during MD simulations. I.e. for each pair of residues, count the number of frames during which they form...

05 May 2018 2,023 8 View

How to get rid of a primer smear in pcr (negative control problem)?

Hello everyone My pcr was doing just fine for few months till about 3 weeks ago I started to get smears in all my samples and positive and negative controls as well. I'm preparing my reaction...

21 March 2018 2,405 7 View

How can I cryopreservate Human Hepatic Stellate Cells?

Dear all, Does anyone know or have an experience in freezing (cryopreservation) of the primary Human Hepatic Stellate Cells? How much DMSO is recommended to use? I read that cryopreservation of...

03 March 2018 9,712 2 View

Freezing atoms in gaussian - how to do it?

Hello, I'm working on a structure with about 200 atoms. It is important for me to freeze a significant part of it for the time of optimization so that the arrangement of the given atoms with each...

05 February 2018 649 7 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

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 1 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

How to plot the probability paper of Gumbel distribution using R programing?

In R-studio, there are many commands of Gumbel package. Arguments are also different. I`m asking about the alpha parameter of the Copula which must be greater than 1. If this is the one used to...

25 February 2021 5,229 3 View

Are there methods for automatically mapping floodplains, fans and terraces?

I want to map these river geoforms with as little subjectivity as possible. I have a high resolution DEM generated by drone data.

22 February 2021 7,800 3 View

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22 February 2021 9,932 11 View

Is there a method for evaluating nanoparticle adhesion to epithelial tissue in vitro?

I want to measure how well nanoparticles can transfect cells based on NP adhesion properties. In the literature I find people do it in animal studies, and epithelial adhesion helps in transfection...

21 February 2021 7,791 3 View

How to select therorical or conceptual framework for any proposed qualitative research work?

Hi, I am conducting an exploratory research with qualitative in-depth interview approach to understand the impact of COVID_19 in health systems response to burn care in India. Since, this is a...

19 February 2021 4,562 4 View

How to model rupture in geogrid in abaqus?

Hi researchers I wanna model tensile test on geogrid in abaqus, so I added displacement to one side of geogrid and the other side of geogrid is constrained completely, everything seems normal but...

19 February 2021 2,195 2 View