How reliable are degrees of freedom for lme mixed models in nmle package?

I am running mixed models analyses because I have participants nested in groups. Across the different analyses, I have very different degrees of freedom in the lme output with nlme package (and...

09 February 2021 6,767 3 View

Power based on past research in multilevel model?

Hi I want to replicate a published article that uses a multilevel model (participants nested into groups). I want to see the sample size I need to achieve an 80% power. I saw the simr r package...

06 January 2021 2,984 6 View

Is there an increase in protein synthesis by stress (p70-s6k)?

Hi, we are testing an antitumor drug and we have seen that the first hour increases the activation of p70-s6k but then blocks its activation. we have also found that both AKT and ERK activation...

25 October 2018 5,290 1 View

Mixed model: Level 2 IV and outcome?

Hi, I asked a related question before but I am asking a slightly different advice.. If I have a mixed model, can I do an ANOVA when both my independent variable and my dependent variable are at...

27 May 2018 6,189 9 View

Problems with flow cytometry. Cell cycle arrest by confluence?

Hello, I am testing a drug in order to see if it can stop the cell cycle. We sow 100,000 cells in a 100mm plate and treat it for 24 and 48 hours. The cells (tumoral and not tumoral) are not...

21 May 2018 6,041 2 View

SPSS factor analysis error degrees of freedom?

Hi, I'm running an exploratory factor analysis on SPSS and I have a message error: the number of degrees of freedom (0) is not positive, Factor analysis may not be appropriate. What does this mean?

10 April 2018 8,098 4 View

Does someone has the Auditory Consonant Trigram Test for children?

Hello, I was wondering is someone has access to Auditory Consonant Trigram Test for children. More specifically, I would like to have access to the protocol (e.g., trigram, time, bounds). Thank...

10 April 2018 3,660 2 View

SPSS : residual vs fit plots ?

Hi, I think I have a problem with a variable in my dataset. I have 2 dependent variables and I am regressing them on a categorical predictor. I graphed the residual vs fit plots for both of...

09 April 2018 5,547 3 View

SPSS mixed model: how to deal with a Hessian matrix error?

08 April 2018 2,698 3 View

Do you know if the CESD-R was translated in French? If so, where can I find it?

Do you know if someone has translated the French version of the CESD-R ?

02 April 2018 583 2 View

Polymer composites suddenly solidifies?

I am making polymer composite by solvent mixing method. When I am trying to add filler solution in polymer solution it quickly get solidified. How to make them then uinform? It doesn't give time...

03 March 2021 7,540 4 View

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View

How do I determine the degree of polymerization of PEG 400 based on NMR integration?

Hello, I am working on the photocatalytic degradation of PEG 400. I would like to know if it's possible to determine the degree on polymerization based on NMR integration, or by the MW of the...

02 March 2021 6,186 3 View

How to polymerize TEOS?

I want to polymerize TEOS on a surface. I know that NH4OH is a preferred catalyst and an alcoholic solvent should be used .But I can not find certain amounts of each material to use. Does any one...

02 March 2021 1,404 6 View

What is recommended for solid domain in ANSYS FLUENT?

Should I mesh the solid domain ? or should I use wall thickness? or Shell conduction? for Heat Transfer between two fluids of a Heat Exchanger. what is recommended?

01 March 2021 9,785 3 View

How can i resolve the "final solutuin is not converged" error in Comsol for my heat transfer simulation??

I have been trying to simulate heat transfer problem in Comsol 5.5 for long time but it always throw an error stating: "Failed to find a solution. Maximum number of Newton iterations...

28 February 2021 8,626 3 View

Can polymer concentrations be calculated based on the number average molecular weight?

Hello, I spin-cast two different polymers onto wafers and measure their height as a function of initial concentration. For polymer A, I have the weight-average molecular weight (Mw) as well as...

28 February 2021 7,882 2 View

PUC19 as a transfer plasmid for lentiviral delivery?

Hello, Is it possible to use pUC19 as a transfer vector to be packed in using the second generation viral particles packaging system( pMD2.G; psPAX2 plasmids)? As far as I understand it there is...

28 February 2021 4,868 2 View

POlymer+DMSO solution and moisture??

What could be the reason of moisture at the sides of Vial when I am preparing my polmyer+DMSO solution for membrane fabrication? What etiquettes I am possibly missing here?

28 February 2021 6,516 5 View

How to reduce residual stresses in MD simulation?

I am working on a preparation of representative polymeric structures of some popular polymers, such as polyimide or PTFE for MD simulation, during which a single nitrogen or oxygen atom will be...

24 February 2021 8,105 3 View