Is the logarithmic transformation a necessary step in time series analysis ?

Hello, I'm checking if the log-tranformation of time series data is a necessary step; We all know the aim of such transformation, but in every study (in time series analysis) we found the authors...

15 February 2021 5,655 14 View

Is the test of the H1 hypothesis in mediation analysis total effect or direct effect?

There are three hypotheses and I carry out direct effect and indirect effects with SEM. H1: There is a significant positive relationship between A and B. H2: There is a significant positive...

08 February 2021 9,141 3 View

How do I convert or prepare a taxi dataset to a time series with the fixed intervals?

I have NYC taxi trips dataset contains multiple attributes like (pickups and dropoffs) coordinates, DateTime also, trip distance and so on, indexed by "tpep_pickup_datetime" coulmn as...

01 June 2020 4,164 4 View

Logistic regression, Linear Regression and Survival models are they complementary methods ?

Hello dear professors and colleagues, I have a data set where I want to applied three methods: Logistic regression , linear regression and survival models, of couse each method focalise on an...

09 May 2020 3,746 7 View

Could the relationship between social media use and 'cocooning at home' be investigated in the Covid 19 process?

Dear academics, I want to do a quantitative research on the use of social media in the process of closing the house in Covid 19 process. At this point, 'cocooning', that is, maintaining a...

24 March 2020 3,879 3 View

Is there any pH buffering system or device for acidic microbiological experiments?

Dear researchers, I am working on acidophilic bacteria and mineral interactions. I will use rock grains in my microbiological flasks and see the effects of bacteria to dissolution of rocks....

18 March 2020 191 4 View

The standard error in the standardized model results section in Mplus7 does not show the standardized error, t value and p-value?

I'm doing bootstrap 2000 for multiple mediated analysis on Mplus7. However, in the standardized model results section,does not show the standardized error, t value (EST./S.E.) and p-value. How...

17 March 2020 9,102 3 View

What would be the effects of coronavirus on publication process and times reviewing of articles?

Hello dear Reserachers, Professors, I'm asking myself and you, for the effects of Covid-19 on publication, reviewing process, and reclassification of priorioties on certain topics; e.g: and with...

15 March 2020 8,598 5 View

Which models are best suited for time-series (multiple variables) data-set analysis?

I have a data-set with multiple variables. I would like to do a statistical analysis to determine the extent of the impact of factors on the change in time, Which models are best suited for...

28 July 2019 2,329 4 View

Agilent 6460 Tuning problem?

It tunes perfectly in Negative mode; and in positive it doesn't see the high masses and subsequently fails. Any ideas?

04 May 2019 8,450 3 View

Chlorinated organic formation in odor control scrubbers using hypochlorite?

I'm involved in a study of odor control technologies for municipal wastewater treatment plant. One of the control options involves a chemical 2-stage (acid/alkaline) packed bed scrubber. The...

03 March 2021 3,661 2 View

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

How to plot the probability paper of Gumbel distribution using R programing?

In R-studio, there are many commands of Gumbel package. Arguments are also different. I`m asking about the alpha parameter of the Copula which must be greater than 1. If this is the one used to...

25 February 2021 5,229 3 View

How can we theoretically calculate Elemental analysis(percentage) of atoms in covalent organic framework?

For example in one research article the Elemental analysis values of COF-TpPa-1 ( Triformylphloroglucinol (Tp) (63 mg, 0.3 mmol), Paraphenylenediamine (Pa-1) (48 mg, 0.45 mmol) are as follows...

24 February 2021 1,265 6 View

How to Control Whiteflies in coconut leaves?

24 February 2021 1,005 1 View

What reaction will occur when adding hexamine into ammonium nitrate in an acidic medium?

Hello, I am investigating properties of water in oil emulsion explosives. And adding hexamine (hexamethylenetetramine) into one of the phases that are used to make the emulsion should increase the...

21 February 2021 8,680 1 View

How to get/count refractive index in gasses?

20 February 2021 8,202 6 View

Any Homemade Organic Synthesis Practices?

Hi everyone, I am a teacher of Heterocycles Synthesis, Is there a home practice that you recommend for undergraduate students? A simulator would also be useful Due to the pandemic, students...

18 February 2021 2,769 4 View

How to find the capacitive response frequency from the impedance plot?

I have done electrochemical impedance by using cyclic voltammetry for one organic material. from that, I plotted bode diagram. but actually, I am very confused about how to find the capacitive...

18 February 2021 3,023 3 View

According to a new research?

17 February 2021 2,372 3 View