# Aleph Technologies Blog

Applications come and go, data stays.

## Maths and Machine Learning – Linear Algebra

I recently read the post by Wale Akinfaderin on the Mathematics of Machine Learning and was compelled to write on the subject as a way to keep track of some useful resources and pointers, having gone – even though having a decent mathematical background – through the process of refreshing up certain mathematical concepts in order to be able to understand machine learning algorithms but also making sense of the strengths and weaknesses.. Read More

## What is the difference between correlation and regression ?

We are assuming here that the “regression” in the question is of a linear form. Correlation is the measure of how strong a linear relationship between two variables is. There are several correlation coefficient standards (Pearson, Spearman, etc). The correlation coefficient ranges between -1.0 and 1.0. Zero correlation means there is no linear relationship between the variables. The greater the correlation coefficient, the stronger the relationship, meaning that when one variable goes up,.. Read More

## What are the different stages of building a model ?

Some weeks months ago I was ingesting my usual load of news related to data science when I saw one of those “frequently asked questions” that proliferate nowadays with the boom of interest in analytics topics. While I could honestly answer most of the questions, I found that some topics required a memory refresh, and in doing so, I thought it would help others refresh theirs, while leaving the door open to visitors’ contributions, in a.. Read More