How to estimate 2SLS with different instruments for different endogenous variables?

To be specific, I want to conduct an IV regression in stata with the following three equations. EQ1: Y1 ~Y2 Y3 X EQ2: Y2 ~ Z1 EQ3: Y3 ~ Z2 Both Y2 and Y3 are endogenous. However, Z1 and Z2 are...

23 February 2021 6,266 3 View

Hi, Good day! Do you have related studies about my title, "Factors Affecting the Senior High School Students' Stress Tolerance in Problem Solving"?

I am new researcher. I want to learn more and I need your help. Thank you.

04 February 2021 6,834 4 View

How to design a PI controller for fourth-order transfer-function ?

Hey! I'm in the work of designing a controller for a zeta converter, it is a fourth-order system. I tried ways like the Ziegler-Nicols method, Root locus method using Control System Designer in...

29 October 2020 4,054 3 View

How to cite the results from Gallup Strengths Finder Assessment?

In my report, I included the ideas from the results given to me by the Gallup Assessment, but I am confused on how I will cite the website using APA 6th edition and what is the format for both the...

12 October 2020 5,396 2 View

Is it possible to get more than one final optimal solution using TOPSIS decision-making method in multi-objective optimization problem?

So is it possible to get more than one final optimal solution using TOPSIS decision-making method in multi-objective optimization problem? If there is the possibility of getting more then one...

01 September 2020 7,680 9 View

How are latent means and observed composite means different?

I know that they are different but I am kind of at a loss for how to explain the difference, but I may be overthinking it. In simple terms, my understanding is that a latent mean(intercept) is an...

19 August 2020 8,857 4 View

How to model water acidification using CO2 and acids ?

Hello, I am trying to model the amount of CO2 vs mineral acid (HCl, H2SO4) needed to acidify water with various alkalinity conditions. It would be helpful if I can get some suggestions on the...

04 May 2020 9,798 8 View

How to calculate V0 (initial velocity) for a discontinuous enzymeaic assay?

Usually, for fixed-time or discontinuous enzyme assay, a specific incubation period (say 30 minutes incubation period) is required before the reaction is stopped and measured (say...

30 April 2020 2,506 2 View

Does Actively Growing Culture delivery from DSMZ require dry ice shipping?

I tried to see the details of the delivery of a bacteria in risk group 1. But couldn't find the exact information . https://www.dsmz.de/collection/catalogue/microorganisms/prices Does...

26 April 2020 7,021 1 View

How to do a two-way ONOVA in SPSS?

I don't have advanced knowledge of SPSS and tutorials aren't making much sense to me, if anyone is able to explain SPSS two-way ONOVA step-by-step in the simplest form I would be grateful. My...

30 March 2020 8,769 2 View

What are the best cations for preparing competent cells, Ca2+ or Mg2+?

I have been reading various articles and most state that treatment with CaCl2 produces higher efficiency of transformation than MgCl2. Can anyone explain why Ca2+ is better than Mg2+ at...

16 February 2021 8,519 5 View

What is the difference between soluble ions and exchangeable cations? And How to determine each of them?

I used percolation columns to reclamation saline-sodic clay soils . And my question is, What is the difference between soluble ions and exchangeable cations?

18 January 2021 6,868 3 View

Which peak should I consider when calculating ZIF-8's crystalline size from XRD?

Hello, Using the Scherrer's equation, one could calculate, roughly, the crystalline size of ZIF-8. However, I am confused as to which peak in the XRD pattern should be taken for the calculation?...

10 January 2021 8,633 3 View

How to estimate total electron content using GPS data (with MATLAB)?

06 January 2021 1,110 2 View

Should you include the charge when writing out ions or ionic compounds?

I'm writing a chapter about the nitrogen cycle and discuss the different forms of reactive nitrogen such as NO3 and NH4. I also have some soil places where I discuss soil cations and others where...

22 December 2020 3,753 3 View

No title

I want to perform an interaction study between the Fe cation of a hemo group and an organic molecule. To do this, I want to use Grimme's dispersion correction with Becke-Johnson Damping (D3-BJ) to...

10 December 2020 2,067 3 View

Why contaminant is eluted with target proteins in cation exchange chromatography?

Me and my partner are doing project involving the purification of equine IgG using both anion and cation exchange chromatography. The main purpose of our project is to separate IgG from other...

10 November 2020 3,377 3 View

How do I correct my ion concentrations data for groundwater when the ions are over-estimated?

I am working on groundwater chemistry data and my ionic balance values are too big. How do I know which ions (anions or cations) have been over-estimated? And, how do I correct the values to get...

22 July 2020 9,069 3 View

How to use constraint in Rietveld refinement?

I am working on spinel ferrites (AB2O4). Since cations in spinels can occupy both tetrahedral and octhedral sites, I need to find out the amount of cations occupying the tetrahedral and octahedral...

28 June 2020 3,677 1 View

Is there a function in Gromacs for quantify ion bridge?

Hi all, I had simulate charged polymers and surfaces, and is very common to have interaction of ion bridge (or ionic crosslinking) which consist of and interaction of two equally charged groups...

24 June 2020 1,678 1 View