Publications by jrcuesta
Improving Monitor statistics with the "UECLs"
New Monitor Video:Improving Monitor statistics with the “UECLs” Related To leave a comment for the author, please follow the link and comment on their blog: NIR-Quimiometría. R-bloggers.com offers daily e-mail updates about R news and tutorials about learning R and many other topics. Click here if you're looking to post or fi...
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Should I adjust the slope?
I add a new video “Should I adjust the slope”, where a new part of script is added to the monitor function. I don´t recommend adjusting the slope, but there are circumstances where it is necessary:Suppose you have an equation, but not the calibration set from which it was developed, in that case is necessary to adjust the slope and the int...
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My first "ChemoSpec" spectra
I’ve been this week trying to import some spectra to ChemoSpec (R Package), at the beginning I had problems generating the “csv” files, and the function getManyCsv did not recognize the files. I did not have properly configured the regional settings in the Control Panel, so I had to configure the column separator correctly, after that the...
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Olive Oil NIR/VIS Spectra – 001 (ChemSpec)
I continue with the practicing with ChemSpec, and this time I import seven spectra of olive oil. This time I have been more careful and I have the frequency column as numeric form the CSV file. Once I have the spectra (with and offset):Take in account the comment form Bryan in the previous post when importing CSV files into ChemSpec. I want to g...
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Preparing Spectrum to import into "ChemoSpec"
In this video I show I to prepare a spectrum to import later into ChemoSpec:The software I use gives the option to export the spectrum as a TXT file.This file is open with Excel and saved as CSV, to import later with others into ChemoSpec. Related To leave a comment for the author, please follow the link and comment on their blog: ...
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Olive vs. Sunflower oil Spectra – 002 (ChemoSpec)
I add other data set of “sunflower oil” to import together with the olive oil into ChemoSpec R package. Before, as I showed in a video (Preparing spectra to import into ChemoSpec), every sample has been acquired with a NIR instrument (in transmittance) and transformed into a CSV file.Olive samples are in red, so we can see some differences vi...
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Hierarchical Cluster Analysis (ChemoSpec) – 01
I have been in previous post using the ChemoSpec package for some oil data (olive and sunflower). My spectra has now a range from 1100nm to 2200nm and is raw (not treated mathematically) . I want to start using the ChemoSpec package to start using the “Hierarchical Cluster Analysis” in order to see some cluster in my data. Of course I hope ...
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Monitor with R: Moisture in Sunflower Seeds Intact
I had the opportunity today to check the performance of a calibration (moisture in intact sunflower seed in reflectance).This is always a exciting moment: Does the performance of the calibration for the new validation set is as expected during the calibration development?. Can I add with the new set more variability to the calibration and impr...
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Hierarchical Cluster Analysis (ChemoSpec) – 02
This is the second derivative spectra of the raw spectra we have sawn in the post: “Hierarchical Cluster Analysis (ChemoSpec) – 01”. In that post we saw some clusters, but the distance between the clusters was not high, so it was clear that some math treatment should be applied to remove baseline shifts and to increase the differences betw...
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Hierarchical Cluster Analysis (ChemoSpec) – 03
It is clear that we can discriminate between olive oil and sunflower oil, but let´s see the reason for the sub-clusters in the sunflower oil.Samples sflw6da, sflw7da, sflw8da, sflw9da, sflw10da are refined sunflower, so it is filtered and processed, that means differences in the water content, and some other physical properties, but apart from t...
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