Salman Tabatabai

4 Questions 8 Answers 0 Followers

Questions related from Salman Tabatabai

Should we scale dummy variables together with continuous variables?

If in a multivariate model we have several continuous variables and some categorical ones, we have to change the categoricals to dummy variables containing either 0 or 1. Now to put all the...

27 November 2019 8,705 3 View

RMSEP lower than RMSECV?

Hi, I used Kennard-Stone sample split to split my samples into 70-30% calibration-prediction sets. I calibrated and cross-validated a PLSR model on the 70% of the data and then used the built...

09 March 2018 3,743 2 View

What does it mean to have low RMSEP and low prediction R-sqaure at the same time?

I would appreciate it if you could share your ideas, suggestions and experiences. I am interested to know that why my PLS regression models work well in CV phase, but when I predict new data with...

23 January 2018 7,550 5 View

Anyone has experience with clustering 3D soil data (cores) based on spectra and take samples for reference lab measurement from different depths?

I have 45 cores from 3 fields and I also have Veris P4000 Vis-NIR spectra up to 100 cm deep at those 45 locations. I would like to take calibration samples from the cores but the question is from...

11 January 2018 602 9 View