EFA and ANCOVA - FAQS.TIPS

More Brandi Todd's questions See All

Why is my RIN low with RNA isolated from neutrophils?

Hi, I have been trying to isolate RNA from neutrophils isolated from whole blood samples. I cannot seem to consistently get a good RIN using the Qiagen RNAeasy mini kit. Does anyone have any...

08 January 2024 4,996 5 View

What's the optimal plasmid concentration to use when electroporating E.coli DH5alpha?

The volume of E. coli cells to be used is 20 ul.

03 July 2023 4,538 4 View

Is it better to include or exclude the native signal peptide in expression constructs used for the purpose of agroinfiltration?

In effector characterization via agroinfiltration of Nicotiana leaves, I've seen these two options in construct design: constructs with a peptide signal and without. Is there any drawback in...

09 January 2023 1,228 2 View

Cleaning data for dissertation ?

As I am cleaning my data for my dissertation for ANCOVA, do I just need to delete responses that did not complete the entire survey? (I used a survey, and some respondents did not complete all...

27 September 2021 823 5 View

Is there a volumetric analysis method available for ethyl ascorbic acid?

Hi, I'm trying to source a titration method for quantifying 3-O-ethyl-l-ascorbic acid content. Is there one available? The standard Iodine L-ascorbic acid titration won't work. Thanks,

22 April 2021 1,526 3 View

What are effective methods for removal of iron from organic acids?

I am seeking methods to remove trace iron from organic acids, including acetic acid, propionic acid, and formic acid. Distillation works, but is expensive. I'm looking for alternatives to...

31 January 2021 1,171 3 View

Is there anyone with identification keys for earthworms of southern or central Africa?

I am looking for taxonomic keys to identify some of southern Africa's earthworms to genus or species level. If there is anyone with information on how to access these keys or an easy way to...

03 August 2020 1,195 10 View

RedCap vs. Qualtrics - which is best for label choice studies?

I am looking for a recommendation about the best software to use for a choice experiment. I would like to execute this study in multiple languages. The software needs to be able to accommodate...

14 July 2020 1,242 14 View

When using explanatory sequential mixed methods, why do you need to use this method when the population groups are uneven?

I am currently working on my dissertation. I wanted to do a quantitative study using 3 groups. Two of the groups are approximately the same size, but the third group is significantly smaller....

01 May 2020 6,742 3 View

Anyone know if T cell depleting antibodies (Th1.1, Cd8) affect tumors or just periphery?

I'm want to deplete cells only in the periphery but do not know if they will deplete T cells infiltrating tumors

07 April 2020 2,119 3 View

Repeated measures ANOVA, ANCOVA or Regression?

Would anyone be able to advise me... I have an RCT with a control and experimental group. Participants were recruited from one school (n=59). Participants were assessed using repeated measures on...

04 August 2024 4,040 6 View

Bonferroni correction. I have independent t-test, paired t-test and ancova conducted. Which test would require Bonferroni adjustment?

I have two groups that I test on three different tasks. I have 4 independent t-test, 6 paired t-test and 2 ANCOVA. My concern for which t-test should I conduct bonferroni correction. At the moment...

28 July 2024 7,827 6 View

ANCOVA for between-subject design?

Hi, I will run an experiment where reaction time will be the dependent variable, tested in 2 conditions (with the same participants). I want to control for a confounding variable (individual...

20 July 2024 1,943 1 View

Selecting items to be removed from the amos model?

I am conducting a scale adaptation study on Amos. However, I am unable to validate the main model, which I attribute to the fact that several items are meaningless in our culture. The scale has a...

14 June 2024 4,344 5 View

Poor CFA factor correlation?

I am currently using the Rosenberg Self-Esteem Scale and the Generalized Self-Efficacy Scale (GSE) to measure the psychological strength of young adults. Finally I have to create psychological...

08 June 2024 1,829 3 View

Is there a way to conduct EFA for two groups (e.g., immigrant descent/non-immigrant descent)?

I am asking this for a scale development study. We have mutual/same items asked to both groups, and some items are asked only to a specific group (e.g., people of immigrant descent). Is there a...

21 May 2024 7,032 1 View

Reduction of items following EFA and CFA will affect the validity of the tool?

I have adopted and validated a 54 item School connectedness scale for my thesis. After the cultural adaptation 2 items removed. After EFA 11 items dropped and following CFA 9 items dropped and...

17 May 2024 4,366 2 View

Literature supporting conducting an EFA on separate new measures?

I conducted an EFA on four newly created measures: 1) awareness of inclusive teaching practices, 2) confidence in inclusive teaching practices, 3) reflection on inclusive teaching practices, and...

07 May 2024 2,140 2 View

Do we always need to remove the questions when we analyses the validation in EFA?

I am conducting a validation study of SGRQ with EFA.SGRQ has 50 items. I got following results... with 8 factor model - NOneed to remove any questions with 7 factor model - need to remove ONE...

05 May 2024 1,050 2 View

When splitting the data for EFA and CFA, is it acceptable to have unequal sample sizes for each analysis?

#Random Splitting Method #EFA #CFA

19 April 2024 6,481 5 View

Imran Anwar

@Brandi Compute composite variables taking observed variables that got loaded under four different factors and this way you'll have four composite variables. Now using these composite variables, you can do ANCOVA or any other metric test.

Brandi Todd

Thank you so much!!

David Eugene Booth

See Montgomery Design and Analysis of Experiments in the z-library for download..read the ancova sections. David Booth