18 June 2021 8 7K Report

I am using FMOLS, DOLS and System GMM estimator together in a study. What are the specific advantages of system GMM in this regard ?

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I'm interested to quantify Urea by HPLC method, reversed phase conditions are preferable. Is there a good method suited for urea?

I have to develop a method that can be good enough to run dozens of samples that include urea as the main compound. I prefer an HPLC method because of the convenience of running large numbers of...

01 February 2021 1,888 4 View

How to convert ng/ul of DNA concentration to pmol/ul ?

Dear researcher, After amplifying my target gene (1900bp) into the required cDNA by PCR,>cut specific gel bands and purify the gel and the concentration was 30ng/ul. Next, performed A-Tailing...

21 January 2021 2,671 3 View

Can use Unigenes from RNA sequences for overexpression studies (transformation) without requiring a specific plant genome?

Dear researchers: If the plant genome has not been released yet, can Unigenes from RNA sequences be used after BLAST and confirmed with known Arabidopsis genes for function/overexpression...

20 January 2021 5,557 2 View

What is the reason of weight gain in TGA curve of a HDPE polymer sample ?

HDPE samples were aged at higher temperatures in the presence of water and CO2 than the TGA test was performed in Nitrogen? Weight gain is seen in the curve? What could be the possible reason for...

16 January 2021 5,644 2 View

Can BLAST/ search by using known Domain in Transcriptome/Genome data for a gene family?

Dear Researchers, I have Transcriptome/Genome data and want to list all the member of a KCS/CER gene family whose Domain AP2/ERF, FAE1_CUT1, according to the Arabidopsis database, so is there...

15 January 2021 2,293 3 View

Is it necessary to measure the concentration of PCR/Gel purified product for A-tailing and TA cloning?

Dear Researchers, While working on plant gene transformation, so after cDNA + Gene Primer amplification, >the PCR/Gel were purified, so next for A-tailing and TA cloning is mandatory to...

12 January 2021 3,272 34 View

Data Normality test in SPSS and Mardia's web of power to check skewness and kurtosis online test?

When we check our data set for univariate (e.g., SPSS) and Multivariate Skewness and Kurtosis as measures of non-normality as defined by Mardia (via Mardia' s web of Power) in order to...

12 January 2021 8,257 5 View

Can use the same vector for overexpression and transient expression?

Dear Researchers, I am using pCAMBIA1301/1302 vectors for overexpression study, so can use the same vectors for transient expression? or need to design another vector for transient expression;...

08 January 2021 7,975 2 View

Why negative controls also showing the specific bands of promotor and other regions (GUS, GFP etc.)?

Dear Researchers, I did a transformation of an empty vector (pCAMBIA1301/1302) into my passion fruit plants, for the optimization of the transformation protocol. After transformation; DNA...

06 January 2021 8,465 99 View

Can anybody help me out in TRNSYS about short term thermal energy storage used as buffer storage ..?

i am a beginner in trnsys and need help ... can anyone please guide me

20 December 2020 1,040 3 View

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Can I use a time series dependent variable in a panel regression?

Hi all Can I run a Gmm model with a time series dependent variable? I have a sample of 12 countries and years from 2000 to 2018

03 February 2021 6,491 6 View

SEM for panel data ?

I'm trying to find the effect of smart cities on sustainable development. I collected data for several indicators of smartness of a city for 15 cities over 12 years. seems like panel data (GMM...

12 January 2021 9,914 5 View

Macrostudies using sysGMM?

Dear all, Could you recommend macroeconomic studies (hopefully published in good journals) that use system GMM or Arellano-Bond estimators? Thanks a lot!

10 December 2020 5,130 4 View

GMM with very short time, is three enough?

I first conducted a fixed effect model using xtreg y x, fe and I found that all the variables are significant and R-squared is .51. So I thought that maybe I should use two step system GMM to...

07 October 2020 5,386 3 View

Exactly same results of OLS ,2SLS and GMM model?

I run OLS regression on panel data in Eviews and then 2SLS and GMM regression. I introduced all the independent variables of OLS as instrumental variables. I am getting exacty same results under...

05 April 2020 4,683 1 View

Why do researchers use GMM-UBM instead of SVM as a classifier?

The Gaussian Mixture Model with Universal Background Model (GMM-UBM) takes individual class training data to train the GMM and uses all training data or different dataset to build the UBM. In this...

03 March 2020 260 3 View

Should we collapse instruments in large samples?

Collapsing instruments in a system GMM model is useful in treating the problem of instrument proliferation. However, the instructions given to xtabond2 of Stata suggest that "In large samples,...

11 January 2020 4,738 3 View

Should insignificant IVs be reported in GMM?

While analyzing a linear relation, GMM produces insignificant results for the main IV in a quadratic regression model. Though the signs of the coefficients' are valid, the results are...

10 November 2019 399 5 View

What are the relevant data and model diagnoatic tests fof System GMM?

The conventional test for the system GMM is 1) testing for instrument validity and 2) test for second order serial autocorrelation. Are there pre-estimation tests that may be relevant i.e...

09 October 2019 9,938 6 View

Does Gaussian Mixture model assume data to follow multivariate normal distribution ?

I have a dataset and trying to apply soft clustering, preferably Multivariate Gaussian Mixture model, but I have following doubts : 1. Does Multivariate GMM assume the underlying data to follow...

30 July 2019 6,266 4 View

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