Measurement invariance of a bifactor model with categorical indicators. What is the recommended approach?

I have a bifactor model with categorical indicators: 4-option Likert-type items. One of my research objectives involves testing measurement invariance between two groups. I have been doing it as...

16 December 2020 4,601 2 View

Rapid color change in fishes?

I have noted dramatically change in color on the body of some marine fishes. For example, I saw a dramatically change from a "intense-yellow" color to "brown" color (normal color), just in one...

19 October 2020 2,717 6 View

How can I get help to identify a species of Coniopterygidae from Peru?

I found a species of Coniopterygidae preying on eggs and nymphs of Aleurothrixus floccosus in a lemon tree. I have followed its biology and have pictures of eggs, larvae, pupae and adults. With my...

16 October 2020 6,421 2 View

Thesis Topic Regarding finance and investment?

Currently undergraduate student and currently searching for topic that can be used. Can be related to event in the recent 5 years. If have suggestion, kindly comment. Your reply is highly appreciated

17 September 2020 6,879 20 View

What is measurement error in a CFA bifactor model if I plan to work with composite measures?

Bifactor models allow users to model both a general factor and several specific (or group) factors. The focus is usually on the general factor, which is what the measure was designed for in the...

13 August 2019 9,296 3 View

How to compare 2 variables where 1 has 2 possible values and the other one are experimental data?

I made 30 assays testing the capacity of 2 chemical products in the removal percentage of dirt. 15 assays were made with the chemical product `0` and 15 with the chemical product 1. I obtained a...

23 November 2017 8,831 1 View

Does anybody have unpublished data using the 10-item Ruminative Response Scale (RRS)?

I'm working on a Spanish version of the 10-item RRS. However, an informal review of published results suggests that the proposed brooding-reflection model shows suboptimal fit. Does anybody have...

04 September 2017 9,877 2 View

Can someone help me?

I work with 2D-DIGE and I would like to know about the Samespots (Progeneses). I never worked with this software, because I worked with Melanie (GE). I have problems to analysis my gels.

07 August 2017 2,404 1 View

Where in the invariance testing sequence should correlated errors be included?

I am testing measurement invariance of a questionnaire. I am aware of the fact that some methodologists think it unnecessary to test for invariance of residual variances and covariances. However,...

03 August 2017 284 6 View

How large should factor correlations be to attempt bifactor modeling?

There is an increase in the use of bifactor modeling to test for general factors in multidimensional scales. However, its use seems to make sense only when there are high correlations between...

28 May 2017 3,043 2 View

What are the most reliable approaches to extract key continuous frames from a video, with complete automation?

I have an input video, of skin (from a microscope that means it is magnified such that blood capillaries are visible). The idea is to extract 15 sec of continuous frames from a video of 1 min,...

02 March 2021 2,735 2 View

How can extract ciprofloxacin hydrochloride disolve in water er to organic solvent such as dichloromethan or any other solvent?

I need a procedure to extract the ciprofloxacin hydrochloride from aqueous solution by using dichloromethane in detail,. I thank you very much.

01 March 2021 4,306 1 View

Which bacteria are suitable for quorum sensing screening?

I want to find a quorum sensing inhibitor from plant extracts. Klebsiella pneumoniae, Moraxella catarrhalis, Staphylococcus aureus, and Streptococcus pneumoniae. I looked for these strains...

01 March 2021 7,675 3 View

How to perform statistical analysis of coefficients extracted from transform techniques?

I am studying the potential of DCT and FFT coefficients extracted from a signal to classify the different objects that emit the signal. I applied the Shapiro-Wilk to confirm that data was not...

01 March 2021 8,079 2 View

Can someone suggest a way to prepare slides to observe under confocal microscope for observing fluorescent tagged proteins??

I am growing the cells on coverslips and transfecting the fluorescent tagged protein directly on them. Then i want to observe these cells under confocal microscope. Currently i am just using...

01 March 2021 6,142 3 View

How to remove fatty material from plant extract?

The resultant solid was partitioned three times with 250 ml of petroleum ether (40-60/c) to remove any fatty material and evaporated to dryness.

28 February 2021 9,464 2 View

Can water be extracted from Olivine?

I have always been interested in geology and wondered about how unique structures of materials behave in different circumstances. I stumbled upon Olivine, the magnesium iron silicate, and heard...

28 February 2021 7,330 4 View

How to make fractions of chloroform extract of plant, using seperating funnel?

28 February 2021 8,466 2 View

Good morning research fellows, Has anyone worked with senna alata plant extract on any kind of fish?

Literatures on the piscicidal effect of sennaa alata is scanty. if you have any related litrature either in the bark, leaves or roots used as treatment to any aquatic organism please kindly help...

28 February 2021 9,138 2 View

How to arrange coordinates and extract climate dataset out of MPI-ESM-MR netcdf files?

Have a nice day everyone, I'm stuck in extracting datasets out of MPI-ESM-MR netcdf files because the latitude ranges from -3*10^6 to 3*10^6 and longitude ranges -5,9*10^6 to 5,9*10^6. Plus, the...

28 February 2021 912 3 View