# Ask the Experts

This is a forum where our (prospective) customers interact with our panel of experienced industry experts and put forth their queries and / or discuss their opinions on issues related to Chemometrics, Spectroscopy, Multivariate Data Analysis and **CAMO’s** statistical software products, solutions and services.

A page from the archives…

## What is Chemometrics?

Literally (and loosely) translated, the word "chemometrics" means performing calculations on measurements of chemical data. This can be anything from- calculating pH from a measurement of hydrogen ion activity to computing a Fourier transform interpolation of a spectrum.

## What is Regression Analysis?

Regression is a generic term for all methods attempting to fit a model to observed data in order to *quantify the relationship* between two groups of variables. The fitted model may then be used either to merely *describe* the relationship between the two groups of variables, or to *predict* new values.

## What is SIMCA?

Classification with the SIMCA (Soft Independent Modeling of Class Analogy) approach is performed by building local descriptive models of known groups and to predict a probable class membership for new observations...

## What is PLS-DA?

PLS Discriminant Analysis (PLS-DA) is performed in order to sharpen the separation between groups of observations, by hopefully rotating PCA (Principal Components Analysis) components such that a maximum separation among classes is obtained, and to understand which variables carry the class separating information.

## What is Linear Regression ?

Linear regression is a statistical procedure for predicting the value of a dependent variable from an independent variable when the relationship between the variables can be described with a linear model.

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