Sample size determination for non-parametric tests?

How do I run a a priori sample size determination for non-parametric tests, like the Mann-Whitney U-test and the Kruskall-Wallis or other non-parametric tests that accord with the unpaired t-test...

24 February 2021 166 6 View

How to determine a priori sample size for t-test with unequal means?

I need to conduct a a priori sample size determinations for t-test with unequal means, but I don't know the sizes of the groups nor the ratio of both groups... Can I do a sample size determination...

24 February 2021 8,289 3 View

How to perform Cox proportional hazard analysis or Kaplan-meier survival analysis in SPSS?

At first please see the attachment. This experiment was performed for a period of 7 days (n=100). After 7 days, we found different level of survival rate (%) for each treatment. Now, I want to...

15 February 2021 9,145 2 View

Format Mothur database to run through dada2?

I am looking to run illumina miseq data through dada2, but the limited identification of this gene means there are no pre-build databases. I have a database built in MOTHUR format, does anyone...

30 November 2020 8,228 3 View

How do you co-culture astrocytes and neurons?

I am planning to co-culture primary astrocytes with immortalized neurons GT1-7 (both from mice). What is the best way to do this?

05 November 2020 5,040 4 View

Anybody expert in Augmented Reality?

i want to make research related to augmented reality for language learning in my classroom. so I need to learn to make simple AR for my class. i need expert to sharing experience about AR.

03 November 2020 9,241 5 View

How can I fix the package installation error in R version 3.6.2?

In the case of package installation, I am facing an error in R version 3.6.2 . How can I fix this problem? I have attached screenshot of R console showing error during package installation....

06 April 2020 307 3 View

Has anyone used paraffin oil (liquid paraffin) instead of saturated alkane mixture in determining RI?

I would like to know if anyone has tried, or has any experience, in analyzing liquid paraffin with GC/MS and recording retention times. As hypothesized, this alkane mixture could maybe serve as a...

14 November 2019 8,547 3 View

Can I construct and ARDL model and test for cointegration with i(1), i(0) and i(2) variables?

Hi, I am currently doing a dissertation on demographic determinants of household savings in China during the One Child Policy, using time series. My variables are as follows: Household Savings- %...

21 July 2019 9,085 21 View

Can we call or rename Artificial Intelligence (AI) Algorithm as an Alternative Intelligence Algorithm ?

Most of the AI Algorithms are based on the the living things behavior including humans, animals, and insects related with day to day activities. Some of the recently developed AI algorithms...

25 May 2019 6,300 13 View

Should I include less important items in con-joint survey experiment?

I plan to do a conjoint survey experiment in which I randomly change attributes of hypothetical job candidates and show two types of potential candidates with different attributes. Then, I ask...

16 February 2021 5,812 1 View

Mixed ANOVA or Multilevel modeling?

Hi everyone, I'm having some questions about choosing the right test for my experiment and I hope I can find help here! Here are the settings of the experiment: 1. participants are randomly...

14 February 2021 1,028 4 View

With or without a Control Group?

Hello, I will do a research with K-12 students (my own students), and it includes a treatment which will last around 3 months. We will see how and whether it will affect their motivation. That's...

08 February 2021 632 4 View

Why is there no ANOVA output for a certain predictor variable in my GLM (in R)?

Configurations: Rstudio v1.3.1093 Packages: car, lme4, MuMIn, DescTools Model: myGLM

22 January 2021 5,284 6 View

How to edit a post hoc Kruskal Wallis test in SPSS that has generated an unreadable table?

I have gathered field data about birds at hanging feeders. One question I am trying to answer is is the proportion of time spent being vigilant at the feeders the same in all species. I have run...

07 January 2021 8,445 4 View

What if the assumption of homogeneity of slope is violated in ANCOVA?

Dear everyone, I implemented a quasi experiment pre and post test design. A new teaching intervention in class. as other researchers did, I used pre test as covariance and run ANCOVA to see...

24 November 2020 6,869 5 View

Method for matching the two unknown DNA extractions of the same mice, taken before and after the experiment?

Hello, I extracted the DNA of my each 13 inbred mice of C57Bl/6J strain, before and after the behavior experiment, 26 samples in total. During shipping the mice I have lost their ID given before...

25 August 2020 5,644 4 View

Question for psychtoolbox users. Divided the screen?

*Question for psychtoolbox users* I using one screen. The function "flip" flips all screen. Can i divided the screen to two areas of "flip"? I have two stimuli with different time display flipping...

10 August 2020 4,828 3 View

Online testing solutions: any online tool permitting recording of participants' verbal responses?

Covid-19, apart from all health consequences, is also having an impact on research projects with human participants. Universities and schools are shutting down and, even when labs are still open,...

11 March 2020 2,711 16 View

Cross-cultural adaptation of a questionnaire: what are the requirements for a translator?

27 February 2020 2,289 11 View