Can someone help me with this error that I am getting while estimating a VAR model in R?

I am using annual time series data to estimate a VAR model in R. However, when I run the command to find the optimal lag length, I get the following error: Fehler in VARselect(data, lag.max = 10,...

18 February 2021 9,647 3 View

A three level hierarchical data structure in multilevel modelling, for multiple response question?

Im refering to Andy Field's example in his book Discovering statistics using SPSS, 3rd edition, page 728, where he gives an example of a data structure with level 1 variable is a memory recall...

26 December 2020 9,717 6 View

How to convert Unit/mL enzyme concentration to FPU/mL or FPU/g concentration?

Is there any conversion formula for this purpose.

06 December 2020 3,283 3 View

How many LED bulbs (warm light) will be required for algal growth?

We have 10 glass boxes with 6 inches width and 12 inches depth. How many LED bulbs or halogen lamps will be required to achieve irradiance of 150 umol/s/m2.

23 November 2020 9,414 4 View

What major hardships teachers are going through due to COVID-19?

Teaching Hardships during COVID-19 in 2020 Please highlight what type of hardships, difficulties you as a teacher going through during these trying times due to COVID-19 around the globe? Even...

05 November 2020 4,142 20 View

Anyone can share a test to measure the level of critical thinking skills in university students?

I am PhD scholar, intended to conduct an experimental research to develop critical thinking skills in prospective teachers. if any one developed a test measure please share with me. bests

26 October 2020 4,403 8 View

Please guide me that which theory will relate to the relationships of personality traits, optimism and somatic symptoms disorder?

I have to write the theoretical framework for the course project regarding the relationships of personality traits, optimism and somatic symptoms disorder? Can anybody guide me that which which...

20 October 2020 6,709 4 View

How to measure internal validation of multiple regression using a split-sample method with dichotomous variables?

I would like to validate a regression model using a 50-50 (or 80-20) split method. In my initial multiple regression I have entered all predictor variables using 'enter' technique. My sample size...

20 October 2020 2,849 5 View

Is it dangerous, if samples produce hydrogen gas inside muffle furnace at temperature around 300-400degree celcius?

Geopolymer, derived from flyash, NaOH, Al powder is required a heat treatment inside the muffle furnace. It may cause releasing hydrogen gas inside the furnace. Will it be explosive? or dangerous?...

11 July 2020 3,405 3 View

How the functionalization of AC, graphene and CNTs affect surface area and pore volume?

As we study that modification/functionalization of any carbon material affect its surface area and pore volume. In literature, sometimes the surface area decreases while in some it increases. I...

07 June 2020 4,783 8 View

New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before?

Question to you and THEM, the New Journal, "Integrative Psychological and Behavioral Science" -- do you not know, and have you not seen, this done before? There appears to be a core problem for...

02 March 2021 3,024 2 View

Which is a lucid standard comprehensive book to guide on psychological scale construction and its standardization?

02 March 2021 7,082 3 View

LOAD DISPLACEMENT CURVES Stiffness increasing in ANSYS non linear analysis. HOW CAN I CORRECT IT?

Hi. I am doing non linear FE analysis using a new material beam under flexural 2 point loading using ANSYS. I have defined a bilinear material model. The solution has converged. In results I am...

01 March 2021 9,911 3 View

How to choose ANN number of hidden layers and nodes?

Hello, Could you please share any interesting research explaining how to choose the number of hidden layers and nodes per layer in case of regression problems using ANN? Thank you, any help would...

01 March 2021 6,200 3 View

PUC19 as a transfer plasmid for lentiviral delivery?

Hello, Is it possible to use pUC19 as a transfer vector to be packed in using the second generation viral particles packaging system( pMD2.G; psPAX2 plasmids)? As far as I understand it there is...

28 February 2021 4,868 2 View

How could I take into consideration the weights of observation in a system of seemingly unrelated regressions (SUR) in rstudio?

I build a model of 4 regression equations (probit and OLS) in R studio. I need to take the weights of observations into consideration. While it is simple to do so for every regression equation,...

27 February 2021 1,233 1 View

Can random sampling have inclusion criteria?

As random sampling means that everyone in the population have an equal chance to be chosen, can it have inclusion criteria? My research participants have been chosen based on the inclusion...

26 February 2021 6,905 10 View

Do you kow of any database containing data on retention time, log P and polarizability for a large number of molecules?

Hi, I am a chemistry undergraduate doing my dissertation project on HPLC. In my project, I need to predict the HPLC retention time of 20 aromatic molecules, the calibration set. To do this I will...

24 February 2021 2,602 1 View

How to run raise regression in R?

if anybody know how to run raise regression in r, and raise parameter selection, please help me

24 February 2021 8,199 1 View

Can anyone suggest me the best way for Regression analysis of Accidents?

Dear Altruist, I want to make a regression analysis based on accident data. But I am not finding the necessary information about what type of regression is more applicable for analysis accident...

23 February 2021 9,956 3 View