Preparation for course

An overview

In preparing for the course, we advise that you invest significant time exercising your coding skills in Python. Once classes start, we expect that you have a basic understanding of Python and some of its core data science packages. Before the first exercise class begin there will be a mandatory assignment that has to be handed in. This should give you an indication how rusty or how skilled you are.

Should you prepare?

• If you have taken our summer course that should be sufficient. You may want to refresh your memories and skills with pandas, numpy and scikit-learn.
• Otherwise, you should carefully follow the guide below.

Preparation guide

We use the Python programming language (version >=3.6) in this course but the course is not about Python. It's about analytical tools and methods for working with social data. To that end, Python is just a tool, like the ability to write English, if you're taking a poetry class. Thus, learning Python from scratch as we go is a strategy that will not work. It's hard to learn to code and there is no way to avoid effort. However, if you get started early it will not only enhance your learning experience, it will also save you lots of time down the road. If you already know a scientific programming language like Matlab, R or Stata, you may have an easier time but learning Python will still require effort.

To get started, head over to the preparation page for the SDS summer course. The teaching material from the summer course is available here where we cover all the recommended knowledge and skills (see below). Some additional external resources are found below.

The most essential skills are basic Python and using Jupyter. We expect knowledge that covers basic data types, data structures, iterative procedures.

The most relevant data science packages are: pandas, seaborn, numpy, scipy and scikit-learn. It is not an absolute necessity that you know all points below for the first class but you are expected to fill out any gaps yourself during the first three weeks. The most relevant skills are:

• Data structuring with pandas e.g. input/output, basic arithmetic operations, using groupby and joining datasets. A great short overview can be found in Greg Reda's three part intro here.
• Plotting with seaborn using explorative plots, e.g. distplot, barplot, regplot, pairplot. It may also be relevant to look at the background plotting framework matplotlib.
• Using scikit-learn to apply and evaluate basic machine learning methods e.g. lasso, random forest with cross-validation.
• If you have time we encourage investigating numpy which is how Python works with matrices.

For more info on these packages check out their GitHub repo's and have a look at the documentation.

A good sanity check is that you can complete Assignment 0 on your own. Consulting online resources is fine, but you should be able to write everything yourself.