Can a rating scale include "not performed"?

I have a 4-point scale to evaluate measures (poor to excellent). Can I extend the point scale by a "0" for "not-performed", or do I need an extra binary coding (checkbox)?

09 October 2017 5,245 4 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

How to access MSCI KLD Stats and Sustainalytics?

Hello all, I'm currently working on my undergraduate thesis and I'm having difficulties trying to access KLD Stats and Sustainalytics because my campus Airlangga University and apparently other...

02 March 2021 8,525 1 View

Do you know any MR image dataset?

I would like to research on MR images (0.5T and 3T). Can you please suggest some websites that I can download dataset including both 0.5T and 3T MR images? Thank you.

02 March 2021 7,735 3 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

No title

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

What is the most reliable source to get Impact factor of journals?

Source to get Impact factor of journals

01 March 2021 6,654 2 View

Where can I find public datasets with Covid-19 patient information?

Hi, I'm looking for public datasets that have CT, X-ray information, or medical records for patients with Covid-19. Does anyone have suggestions?

28 February 2021 4,760 3 View

Which index or sites are reliable in determining of plant species?

There are many indexes when determining plant species: Plants of the World Online (POWO), International Plants Names Index (www.ipni.org), The Plant List (www.theplantlist.org) and others. But...

26 February 2021 3,404 10 View