How to interpret arima model with regressors in r?

Hi there; I need to produce such an equation for a time series using arima model: y(t) = y(t-1) + a*x(t) + b*x(t-1) I know if I use for example arima (1,0,0) with x as the exogenous...

07 August 2020 7,438 6 View

Why some use seasonal ARIMA(p,d,q) (P,D, Q) instead of SARIMA?

Hello everyone. I am trying to use ARIMA model for a time series with seasonality. As I am new to this topic, I use the internet as my guide. My question is why anyone should use Seasonal ARIMA...

05 August 2020 219 4 View

Where is appropriate to publish a paper on Covid-19?

Dear colleagues We are writing a manuscript of our research on electrolyte imbalance in patients with covid-19. What is your suggestion to submit this manuscript? Tanks for your time Dr Moosapour

10 May 2020 6,772 3 View

How can I add stations to HBV-Light model?

Hi everyone. I've been using the original HBV model, so far. I might need to change it to HBV-light. Does anybody know how to add stations to HBV-light software? I can see there is this...

01 April 2020 1,032 7 View

How to define the parameters of Spatio-Temporal variogram models?

Hi everyone; I have a question regarding the parameters of variogram modelling. Does anyone know how to choose parameters such as Sill, Range and ... for the time, space and joint components of a...

10 February 2020 2,381 6 View

How to change tunit in VariogramST (R)?

Hi there, I am trying to use VariogramST function in R, for spatial-temporal kriging. The values I am working on, are monthly based; while in the function VariogramST, the predefined "tunit" is...

27 January 2020 5,986 3 View

Which website/ organisation do you suggest for English Editing?

I need to have my paper edited. The journal I want to publish in suggests to edit but it is very expensive. I was wondering if you have any experince to share with me.

01 July 2019 486 5 View

What are the reasons of shifting peaks to higher and lower potential in anodic scan and cathodic scan , in CV?

05 September 2016 7,822 4 View

Is Stata or nlogit for estimating a binary model

I am estimating a choice experiment model, but i don't know which software is better, the nlogit software or the stata software. different studies have been using either nlogit or stata and there...

21 November 2014 2,017 5 View

Does anyone have a protocol to orally induce diabetes type 2 in mice?

I need to induce diabetes type 2 in mice. Any suggestions?

06 December 2012 5,126 3 View

Buffer Exchange using column packed with sephadex G-25 effect on protein concentration?

Hello, If i am doing a buffer exchange for an antibody of 1mg/mL, does the elution lose protein in the process of buffer exchange? For example, if i flow through 500 uL of 1mg/mL sample, and...

03 March 2021 6,299 3 View

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03 March 2021 5,360 2 View

How can we raise the figure when we writing a paper with Latex ?

Hi, everyone. I'm a starter to write a paper by Latex. But I have some difficulty using it. I'm writing the paper with 2 columns. And, there is one figure that occupies the 2 both-sides. I want to...

26 February 2021 3,738 3 View

What is the best way to calculate the angles of twist for concrete columns subjected to torsional moment using finite element software?

In Finite element software like ANSYS , there is difficulty in obtaining direct results of twisting of concrete members because SOLID65 which is the unique element designed to represent concrete...

26 February 2021 3,806 2 View

Compute for the total volume of concrete needed for the concrete pouring of the foundation including its column up to NGL only as shown in the plan?

Looking for the quantity of cement, sand, and gravel of footings and columns. Thank you!

25 February 2021 3,092 2 View

No amplification data for qPCR on MxPro?

I have set up a qPCR run on MxPro with SYBR green and ROX as a reference, however, when I go to the analysis section the program seems to only collect data for the dissociation curves and not the...

25 February 2021 8,039 1 View

Can I use TCA instead of TFA for protein analyis in RP-HPLC?

I am trying to analyze lipase using the reverse phase-HPLC C18 column. In the literature, 0.1 % TFA was and 60% ACN was used. Can I use TCA in place of TFA? If any other methods are available to...

25 February 2021 2,388 3 View

Can I use acetic acid with an ELITE WAX Perkin Elmer column for Gas Chromatography?

Hi! I would want to know if I can use acetic acid with an ELITE WAX Perkin Elmer column for Gas Chromatography. This column has a polyethylene glycol phase, but I can't find the manual to check...

22 February 2021 730 2 View

My silica gel column dried can I somehoe save the trapped matter?

I tried to separate my substance from a protein in a sillica gel column. By mistake, it dried and cracked. Can I save the trapped substance? Can I repack it ,or at least elute all of the trapped...

22 February 2021 1,789 3 View

Physical-chemical formation of stalactites/stalagmites. what promotes the formation/growth of these structures?

I know, or think I do, the basic idea behind these natural structures, as from what I know they form due to water dripping from the top leaving a salt deposit behind. But started to wonder about...

22 February 2021 1,400 4 View