How to identify cases causing the area under the curve below 1 in SPSS?

I conduted ROC curve, the area under the curve is .911 I want to know how to identify cases that make area under th curve is less than 1

02 March 2019 6,524 3 View

measuring tool validity?

I have developed an non invasive risk assessment tool to estimate the stenotic risk of atherosclerosis to detect asymptomatic individuals. The carotid duplex will be the standard measure. My...

10 November 2017 9,951 3 View

Assess new tool for estimating the risk of atherosclerosis ?

If I,m going to asses reliability of new tool developed by me to estimate the risk of atherosclerosis through a cross sectional study how to calculate sample size avoid confounders make randomization

10 November 2017 663 0 View

Evolve elsiever website ?

01 February 2017 9,762 0 View

Histological structure of rabbit's muscle?

Is there any differeance in histological structure of orbicularis oris muscle of rabbit and human ?

10 November 2016 820 3 View

I want to study histological effect of botox injection in orbicularis oris in rabbit ?

01 February 2016 4,716 2 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

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

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