Is UV (unit Variance) scaling suitable for FTIR data?

For metabolomic data analysis, different choices for scaling are available such as Pareto, centering, unit variance etc. which of these scaling methods is recommended for FTIR data? Thank you.

07 August 2017 9,880 2 View

How much the standard deviation should be?

07 August 2016 6,098 2 View

Can i store Potassium Phosphate buffer for long time?

I prepared Potassium Phosphate buffer and i want to be using it for a long time. What are the optimum storage conditions? Thank you

04 May 2016 8,858 5 View

Antioxidant Assay

What is the difference between Thiobarbituric acid (TBA) and Thiobarbituric acid reactive species (TBARS) Assay Thank you

04 May 2016 5,934 2 View

Which solvent is the best option?

For phenolic extraction in a non-defatted sample between methanol, ethanol and ethyl acetate which one will be the best option and why? Thank you.

03 April 2016 6,617 4 View

Please can some one help me with this article title A new method of standartization of health-promoting pomegranate fruit (Punica granatum) extract?

pomegranet

31 December 2015 6,048 1 View

Why do we need to purify plant extract before HPLC Analysis?

I used Three solvent of different polarity ranges from non polar, semi polar and polar, should i need to purify my extract before running HPLC and i need help for the purification protocol. Thank you.

31 December 2015 1,317 10 View

What factors should be considered in changing the composition of mobile phase in gradient elution?

What factors should be considered in changing the composition of mobile phase in gradient elution?

11 December 2015 3,398 4 View

Binary Logistic Generalized Linear Mixed model in SPSS. Is it doable?

I want to analyses the proportion of swimming sperm of three species of fish in two salinities. To analyse the proportion of swimming sperm in a Generalized Linear Model, I would use a Binary...

03 March 2021 2,297 3 View

Logistical regression using SPSS for a dichotomous dependent variable, with an independent variable of 1, 2, 5 and 10 seconds?

I have an experiment with 28 participants The independent variable is the times 1, 2, 5, and 10 used as the cross hairs during a task These 4 times were tested using 4 different blocks, each...

03 March 2021 9,692 2 View

Do I need to do linear regression before running mediation analysis using PROCESS MACRO by Hayes ?

I just wanted to check if I need to run a linear regression separately if I am using PROCESS MACRO to run mediation analysis. Thank you.

02 March 2021 4,359 3 View

What analysis to choose with a large neste dataset and clearly skewed or kurtotic distributions?

Hello! I have a dataset of n=3000 nested within 8 countries with approximately 200 or 400 responses in each country. I originally planned to perform multilevel modelling with 4 dependent variables...

02 March 2021 6,865 1 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

Can polymer concentrations be calculated based on the number average molecular weight?

Hello, I spin-cast two different polymers onto wafers and measure their height as a function of initial concentration. For polymer A, I have the weight-average molecular weight (Mw) as well as...

28 February 2021 7,882 2 View

Can anyone provide the Support vector regression code structure of LIBSVM MATLAB or python ?

Please, if Gaussian Parameter optimization is possible in this code structure

28 February 2021 278 3 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

Mediation path analysis - Can I run two seperate models?

I am wanting to run a serial mediation model with 2 x IVs, 2 x MVs, and 3 DPs (all continuous). Is it problematic to run 2 different models for each IV, keeping the MVs and DPs the same in each...

27 February 2021 5,681 3 View

VIF very high, but correlation is low and coefficient is significant. Which one whould I choose?

Hello. I have a question whether if my coefficients (statistically significant) would be valid when VIFs are really high. In my model, there are independent variables(IV), moderating variables...

26 February 2021 956 13 View