How to create a good database for a gravity model? Also-fixed effects?

Hello everyone, I have been having problems with gathering all the information that I need for my study and also, some problems with fixed effects. 1) First of all, I am interested in comparing...

11 December 2018 5,767 3 View

Dealing with panel data in SPSS: how to add blocks?

Hello everyone! I am using SPSS with panel data and would need to use mixed models for that. My first question is: Can I add blockwise entry of variables? If so, how can I do that? I would like...

08 September 2018 3,184 2 View

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I need help with my data analysis. I am using a non-validated translated questionnaire in my survey. The purpose of it is not to validate the measure in a different language and its construct...

06 July 2018 7,540 4 View

Regression analysis on 33 participants? Is it possible?

I was wondering if I can run regression analysis although I only have 33 participants. If I can: 1. what is the recommended method of doing so? 2. what are the most basic assumptions for...

06 July 2018 3,667 7 View

Non-normal distribution but also a symmetrical one?

1. What does it mean when a distribution seems to be non-normally distributed, according to both Kolmogorov-Smirnov and Shapiro-Wilk normality test and yet the skewness/error results

06 July 2018 5,260 7 View

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

How optimize the Size Exclusion Chromatography?

Hello! I'll do a size exclusion chromatography, but I only have an open column, and I'll perform the peptide extraction from yeast, using buffer lysis (sodium phosphate 50 mM/NaCl 30 mM/DNAse and...

01 March 2021 2,215 2 View

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01 March 2021 3,905 5 View

What test should I use to compare two or three means, if data is not normally distributed but sample size is > 30 in each group?

I personally feel this as a most confusing question. As per my understanding, if sample size is > 30, and sample is skewed, we can still use paramteric approach, as it will follow Z...

01 March 2021 1,587 6 View

Is it necessary to report effect size (ES) in statistics of biomedical research given that we already report p values routinely?

Pls share your thoughts

01 March 2021 7,330 4 View

Can I run spearman's correlation on non monotonic data? Is it advisable?

Hi all, I am running a partial correlation analysis on mood data. I want to see if there is a correlation between scores on a novel hypomanic mood scale and existing measures of hypomania - the...

25 February 2021 1,619 3 View

Why there are two peaks while using the mie plot of Silver nanoparticle?

Hi, I am trying to learn the theoretical modelling of silver nanoparticle using the Mie scattering theory. After that, I discovered a software named Mieplot developed by Philip Laven, where it...

25 February 2021 7,493 6 View

How to calculate Z (the number of molecules in a unit cell) for calculating theoretical density?

I am trying to calculate the theoretical density of my ceramics materials. I use the formula below to calculate the theoretical density: Theoretical density = (Molecular weight x No. of molecules...

24 February 2021 3,823 2 View

How to handle studies which report perfect effect sizes in a meta-analysis using Pearson's r?

I'm in the process of updating a meta-analysis and in one of the new studies, effect sizes are reported as Tau-U. Two of the effect sizes are reported as Tau-U = 1.00. I am using Andy Field's...

24 February 2021 2,265 3 View

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