Is there R-squared in the spatial error model or spatial lag model?

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Why FTIR can not detect bases of nucleic acid in extracellular polymeric substances (EPS)?

I characterized functional groups of EPS using FTIR. Goups of sugars and proteins (e.g., -OH, amide, -COOH) as well as phosphate group of nucleic acid were readily detected. However, peaks of...

05 February 2021 4,405 1 View

Why my BOC-protected compounds got deprotected during evaporation?

I purified my Boc-protected molecule using HPLC. The eluent is ACN/H2O/(0.05% TFA) . After I evaporated the solvent (65 oC), the product was collect as the MS result showed ~20% of the product was...

14 January 2021 5,487 5 View

Who can tell me the easily acquired Pb hyperaccumulator?

The common used Pb hyperaccumulators in the experiment, which and can buy from the business. Thank you!

14 January 2021 460 3 View

Does anybody have the recipe for making a home made R electroporation buffer for Neon transfection systems?

I tried the recipes below in two cells lines: 1.DPBS 2.DPBS+MgCl2(1mM) 3.DPBS+Sucrose(250mM) 4.DPBS+MgCl2(1mM)+Sucrose(250mM) 5.R Buffer (Neon) the results showed that R buffer is the best one in...

06 January 2021 6,776 1 View

What's the criterion of the Discriminant Validity between dimensions of second-order variable?

Hello All, I am doing a study that includes two constructs, using PLS-SEM. Based on previous literature, those two constructs can be included in the same category. Considering the discriminant...

05 November 2020 1,295 2 View

How to compare image data of simulation and experiment?

Hi colleagues, We need to analyze optical images from simulation and experiment. However, since the simulation data are in form of optical intensity and the experiment data are in form of gray...

26 October 2020 7,873 3 View

Is there a technique to implant a cannula for repeated CSF sampling?

We need to collect CSF samples repeatedly from the 4th or lateral ventricle of rats. Does anyone know of a protocol for implanting a cannula to be able to do this? Or even a protocol for this...

26 October 2020 5,804 3 View

Are there any structural differences between sucrosic dolomite and saddle dolomite?

Sucrosic and saddle dolomite are known to be different petrographically. However, are they different in structure, e.g., under XRD or TEM?

20 September 2020 2,495 2 View

Why simple site-saturation mutagenesis is not successful?

We are doing site-saturation mutagenesis of LeuDH. But when we are mutating Q to G, the result of the sequence is always wrong, only a small fragment is the same to our templet plasmid. I have...

15 September 2020 9,201 8 View

For Ultrafast Transient Absorption Spectrometer: How to choose a spectrometer?

hi,we want to build an Ultrafast Transient Absorption Spectrometer system, how to choose a spectrometer? We already have femtosecond lasers system (coherent) ,pump probe system(home built), white...

10 September 2020 4,693 3 View

What are possible instrumental variables for business dynamics (firm entry/exit)?

Dear All, For my paper, I use business dynamics (firm entry/exit rates) as an independent variable in the econometric part. Due to endogeneity I follow a 2SLS approach, for which I need a...

28 February 2021 5,322 3 View

Can we recognize signs of the "volatility clustering" property of a time series in its time domain plot?

My purpose is to recognize the volatility clustering property without statistical tests such as The Lagrange Multiplier (LM) test.

24 February 2021 4,150 3 View

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

Any recommendations for methods to analyze elephant space-use (using GPS) and correlating this with changes in NDVI?

For my Masters I am looking into elephant space-use and its effect on vegetation change. I have elephant GPS collar data and was going to use Google Earth Engine to obtain NDVI values. I would...

16 February 2021 7,097 3 View

Do we have any empirical model to model the combined effect of carbonation and chloride attack in concrete concerning climate change?

Do we have any empirical model to model the combined effect of carbonation and chloride attack in concrete concerning time-dependent temperature, relative humidity and concentration of carbon dioxide?

08 February 2021 4,277 1 View

In panel data, How FGLS method eliminate heteroskedasticity?

Hi everyone Dear friends I have a panel data model with heteroskedasticity, I know one way for overcoming this problem is to use FGLS method. I've searched a lot, but i don't get how this method...

07 February 2021 2,990 5 View

Habitat Suitability through GIS without presence-absence data?

What kind of models/techniques can be used with GIS spatial analysis in order to determine habitat suitability for a species that is not (widely) present in a certain region? For my bachelor...

31 January 2021 2,777 2 View

Do head direction cells necessarily encode in an allocentric reference frame?

According to the vertebrate literature, I got the impression that head-direction cells are always anchored to an allocentric reference frame. This can easily be tested with freely moving animals....

27 January 2021 3,821 3 View

How can I implement a Generalized Estimating Equation method on spatially autocorrelated time-series data?

I used Generalized Estimating Equations (geepack in R) on my regularly monitored (twice a year) plant abundance data in grid cells to evaluate their trends of density. Since these are time-series...

26 January 2021 3,833 1 View

Is it possible to do correlation analysis and multiple regression analysis on my thesis using Excel ?

Is the excel sheet ok or I need econometrics tools such as SPSS and MATLAB?

18 January 2021 1,963 25 View