Compare to prevalence before and after covid in population studies?

Dear researchers, I have a prevalence of some diet habit in relatively large narrow population of children 13 years old in 2019 and 2020. Logically they are different population. However, since...

10 January 2021 3,170 9 View

Online self reported survey on nutrition and physical activities of children aged 11-12 years old?

Do you have some recommendation for this this type of survey? Some standard form of survey? I am looking for some short form, that can be easily done by children.

25 July 2020 2,641 3 View

GINI fractional regression and log transformation?

I would like to estimate changes in GINI during 15 years. Should I make log transformation of independet varible? Raw data for some independent varibles are not normaly distributed. Sincerely, A.

23 March 2020 1,601 3 View

Relativity of simultaneity and free fall: Do all observers see that two objects reach the surface at the same time when they are dropped?

Hi there, my question concerns a situation in which the law of free fall and the relativity of simultaneity come into play simultaneously. The general assumptions are as follows: 1. if we let...

03 February 2020 7,392 29 View

Bootstraping DEA scores and SE?

Dear all, I try to do a research based of DEA using bootsraping techniques in R packages: Bootstraping and DEAr. Does someone know how to calculate SE with 95%CI and how to obraine summaried...

24 October 2019 6,353 3 View

GINI coefficient EXCEL/R/SPSS?

Dear colleagues, do you have some EXCEL template for calculate GINI coefficient and create Lorenzo curve? I find some R packages but I am not sure how to use it on my date with population and...

12 April 2019 5,293 2 View

What secretes/produces the cytokine IL4?

Hello, I'm little confused about the secretion of IL4. In some papers it is mentioned that B cells secrete IL4, on other that it is Th cells, or even basophils. Can you also provide me with...

13 August 2018 9,329 3 View

Plants as Methane Producers? What is the latest standard of knowledge?

Dear All, not only in all known to me textbooks, but also in my academic environment, plants are only discussed as carbon sinks and therefore planting forests is said to be one of the main...

08 November 2017 6,587 7 View

Does Occam's razor favor MACHOs as candidates for Dark Matter?

Dear All, not only in our university, but almost in all well known to me lectures about Dark Matter, MACHOs (Massive Astrophysical Compact Halo Objects) are rather incidentally discussed while...

25 October 2017 9,570 2 View

Radnom sample froms survey data?

Using survey data, I planed to make log regression. Original sample size is 2000 and there are obaut 10% cases with outcome and 90% withoit it. May I chose amongst thant 90% random sample matced...

19 September 2017 3,296 1 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

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 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

How to increase a model accuracy ?

dear community, my model is based feature extraction from non stationary signals using discrete Wavelet Transform and then using statistical features then machine learning classifiers in order to...

03 March 2021 6,994 5 View

1. What is the impact of having different scales in a survey? and how can we solve this problem before and after data collection (Literature)?

1. What is the impact of having different scales in a survey? and how can we solve this problem before and after data collection (Literature-based reflection)? Thank you for your time and for...

03 March 2021 2,870 3 View

Do I need to do linear regression before running mediation analysis using PROCESS MACRO by Hayes ?

I just wanted to check if I need to run a linear regression separately if I am using PROCESS MACRO to run mediation analysis. Thank you.

02 March 2021 4,359 3 View

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02 March 2021 3,060 3 View

How to code open-ended questions in SPSS?

Hello all, In SPSS I am going to code 2 open-ended questions. I have already read all the answers and I made a list of the most important categories to which I can code the answers. This question...

02 March 2021 1,757 4 View