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

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

Is there any biological reason why H2B-GFP is widely use to visualize mitotic chromosomes as opposed to using any other histone-tagged protein?

21 January 2017 4,226 5 View

Logistical regression using SPSS for a dichotomous dependent variable, with an independent variable of 1, 2, 5 and 10 seconds?

I have an experiment with 28 participants The independent variable is the times 1, 2, 5, and 10 used as the cross hairs during a task These 4 times were tested using 4 different blocks, each...

03 March 2021 9,692 2 View

New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before?

Question to you and THEM, the New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before? There appears to be a core problem for...

02 March 2021 3,024 2 View

How to define and get results (stresses) for certain points of a model in abaqus, using python? When the size of the model changes?

I want to do a parameter study of a aixsymmetric cylinder in Abaqus. I want to create several jobs where I get the stresses for 3 different points in my model. These points are defined. I wrote a...

01 March 2021 10,078 1 View

LOAD DISPLACEMENT CURVES Stiffness increasing in ANSYS non linear analysis. HOW CAN I CORRECT IT?

Hi. I am doing non linear FE analysis using a new material beam under flexural 2 point loading using ANSYS. I have defined a bilinear material model. The solution has converged. In results I am...

01 March 2021 9,911 3 View

Does any one can help me choose a reasonable basis set for intermediate metal ions interactions with guanine (i.e Fe2+, Mn2+, Cu2+ and exc.)?

Hello every body Does any one has any idea to help me choose a reasonable basis set for intermediate metal ions (i.e Fe2+, Mn2+, Cu2+ and exc.) interactions with guanine or other DNA organic...

01 March 2021 6,187 2 View

What could be some reasons why unstimulated monocytes are getting activated?

Im doing PBMC isolation -> CD14+ enrichment using magnetic beads -> stimulation setup. My negative control is just cells in cRPMI but they seem to get activated over and over again.

28 February 2021 7,883 3 View

Why does intensity drops as concentration increases?

Is there any reason for decrease in fluorescence emission intensity of HSA,BSA when increase the concentration ?

28 February 2021 3,653 4 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

Should we reduce the standard unit of length to 0.31951540592 meter ?

The reasoning behind this question is to align the ratios of the proton potential in energy per charge to the speed of light in distance per time. As these two dimensions appear to be related,...

27 February 2021 947 7 View

How relevant is Mini slump cone?

for all the rheology researchers, my question is, how relevant is a mini slump cone (smaller than a standard 50 cent rheometer). currently based on testing, the thickness of slumped material is...

26 February 2021 3,668 1 View