Can anyone advise me on the assumptions of IRT?

When I showed my refined scale after running a CFA and EFA (11 items, 3 factors, 4, 4, 3) a statistician at UCL told me that I had too few items per factor to run IRT. Does anyone have any...

31 December 2019 2,903 3 View

Why can't I run an IRT if I have more than one latent variable? Is there a minimum number of variables on a construct needed to run an IRT?

Hi, I am developing a psychometric scale. I have three factors and I have been told by my supervisors that I won't be able to run an IRT because there is more than one latent variable....

02 March 2019 2,155 1 View

How do I compare two correlation matrices in STATA?

Hi there, I am developing a tool for people with Personality Disorders (PD). I have two samples; one Non-PD (n=506) and one PD (n=650). How do I compare the correlation matrix of both of these...

01 February 2019 5,607 1 View

(Repost) Would anyone like to take part in my study?

07 August 2018 4,692 0 View

What are the similarities and comparisons between Mplus and R?

03 April 2016 2,337 5 View

Hi, I am developing an Employment Scale for people with PD, do I have to run an EFA/CFA on non-clinical samples first?

I am struggling to find references for testing structural validity of a scale on non-clinical samples first, before running an EFA and CFA on people with personality disorders. I was told this is...

01 January 1970 1,001 2 View

Do we need to write protocol for a second study of a systematic review that has been registered and published?

I have conducted and published a systematic review and meta-analysis research with the topic related to public health and health pomotion (protocol was registed in PROSPERO). Now we want to...

03 March 2021 8,920 3 View

What degree of missing data in a particular case/participant results in Expectation-Maximisation no longer working?

I'm dealing with a mediation model and am using the PROCESS module in SPSS. Due to SPSS and PROCESS being limited in the imputation methods - being unable to handle multiple imputation - the other...

02 March 2021 4,362 1 View

Ideas for Phd's Thesis on pricing (Marketing)?

Hi everyone, I'm studying Marketing and I would like to write my PhD thesis on the topic of pricing. Any specific ideas?

02 March 2021 9,706 5 View

Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 3 View

How to write a scientific report?

We are analysing scientific reports at University in great detail, so I wanted to find a scientific report about how to write a scientific report. Including detail such as what information to put...

02 March 2021 7,602 4 View

Could any one guide me, to write research proposal for grant? ?

We have one plant, the local people using this for controlling blood sugar, the toxicity and antidiabetic activity of the plant is not reported yet, please guide from whag should be the process ?...

02 March 2021 2,300 1 View

Energy minimization in LAMMPS using NVT ?

How do I do energy minimization in lammps with NVT ensemble ? I am using the following command and it does not seem to work. It stops at extremely high energy and gives me the error zero search...

01 March 2021 2,294 3 View

No title

01 March 2021 3,905 5 View

How to Balance Bench work with Reading and Writing?

I am a second-year grad student. I am finding it difficult finding time to read literature and write (things like qualifying exam, thesis, grants). I find myself so busy with bench work that I...

01 March 2021 3,325 4 View

Which software is better to write systematic review paper?

We have seen some authors use some software to write review paper. As obvious, the study of all published papers concerning our studying field is not possible and these software can help us to...

27 February 2021 6,296 1 View