18 Questions 32 Answers 0 Followers
Questions related from Azzeddine Reghais
In your opinion, which programming language would you suggest as the best choice for researchers specializing in hydrology and water resources?
11 October 2024 7,569 10 View
I would like to use correlation analysis to check the co-occurrence of HMs in the sediments and visualize the results using a grid showing the connections between the different HMs within the...
21 March 2023 2,082 0 View
How can I define a graphics space to make plots like the attached figure below using the graphics package in r? I need help locating each position (centering) using the "mar"...
13 March 2023 8,928 4 View
How to run the Bootstrap method to estimate the error rate in linear discriminant analysis using r code? Best reghais.A
24 January 2023 1,521 8 View
How can I add the robust confidence ellipses of 97.5% on the variation diagrams (XY ilr-Transformed) in the robcompositions ,or composition packages? Best Azzeddine
08 January 2023 8,051 1 View
I would like to use the R package "gstat" for predicting and mapping the distribution of water quality parameters using tow methods (using kriging and co-kriging) I need a guide to codes or...
26 November 2022 8,493 4 View
What ways can I get measurements of ozone and nitrogen dioxide concentrations in an area? What satellites provide this type of data and can I use Google Earth Engine to retrieve the data when it...
19 July 2022 7,041 2 View
According to (USEPA IRIS 2011), the toxicity responses (dose responses) to heavy metals are given as the oral reference dose (RfD) and oral slope factor (SF)) by (mg/kg/day) and (mg/kg-day)1,...
08 March 2022 5,581 3 View
I calculated the heavy metal index (HPI) for forty-five groundwater samples and got some very high values (HPI > 2500). Although I rechecked the calculation method and found that everything was...
07 March 2022 5,796 15 View
Several methods have been suggested in many studies One of these solutions is to use the guidelines Which of these guidelines are used and can they be provide (Name , Lien, PDF...) to...
04 March 2022 1,616 10 View
Does the slope factor (SF) and reference dose values (RFD) for different metals remain constant when assessing the risks of heavy metals in water, soil, or sediments? If it is different according...
04 March 2022 8,767 2 View
Weights derived from PCA analysis to calculate the water quality index. ? Is a robust PCA analysis always required to derive the weights of the parameters, or is it also possible through a...
20 February 2022 9,832 4 View
I've already installed and loaded the package in Rstudio, but I'd like to learn how to use the package from the database loading to the output results. my sincere gratitude.
06 February 2022 1,966 3 View
How weights (WQI) derived from relative loads and eigenvalues associated with water parameters in principal components (PCs) are calculated? I need help
05 February 2022 3,411 1 View
Hello, I'm currently using the Phreeqc modeling program. How to enter a data set of solutions at once.?
25 January 2022 7,130 2 View
Dears, I am new to using PHREEQC However, I use r programming Are there resources on how to use PHREEQC using R language? Please Help Best
25 January 2022 263 4 View
Can I change Guidance (CCME 2004) canadian in For example, I use the standards of the W orld Health Agency or the Indian Agency of Health? Can I change the sheet excel (Guidance) and work on it?
01 March 2021 3,272 6 View
I ask all colleagues to advise me of drawing methods of get the best Gibbs diagram
25 December 2020 6,096 3 View
