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Gianluca Malato. The correct way to sample a huge population When we perform a sample from a population, what we want to achieve is a smaller dataset that keeps the same statistical information of the population.
Stratified sampling Stratified sampling is a method created in order to build a sample from a population record by record , keeping the original multivariate histogram as faithfully as possible.
Written by Gianluca Malato. Theoretical Physicists, Data Scientist and fiction author. I teach Data Science, statistics and SQL on YourDataTeacher.
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More from Towards Data Science Follow. I wanted to split the string but also keep the delimiter. Let's start at the beginning. If you do not know what regular expressions are, I will give you a short introduction.
With regular expressions you can describe patterns in a string and then use them in functions like grep , gsub or strsplit. A regular expression is a pattern that describes a set of strings.
If you are looking for a specific pattern in a string — let's say "3D" — you can just use those characters:.
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