Why companies prefer hiring PhDs

Jessica YungCareers, Education

Many companies have ‘PhD in e.g. computer science, machine learning, maths or [insert quantitative discipline]’ in their minimum qualifications for data scientists, machine learning scientists or quantitative researchers. Why is this so? Here are a few of their responses: PhDs bring real expertise in their areas. We need expertise in cutting-edge methods and technologies and it’s unlikely that people who haven’t … Read More

Social Choice Theory Parts 1-3: A Summary (Stanford Encyclopaedia of Philosophy Article by Christian List)

Jessica YungEconomics

In this post I outline what was included in the first three parts of the Social Choice Theory entry (written by Christian List) in the Stanford Encyclopaedia of Philosophy. Unless otherwise labelled by ‘Thoughts:’, all content is paraphrased or quoted from List’s article. 1 Social Choice Theory is The study of collective decision processes and procedures. Concerns the aggregation of individual inputs … Read More

What does the Lagrange Multiplier mean?

Jessica YungEconomics

Note: The crux of this post really is in talking about the Lagrange Multiplier, so scroll down to ‘The Lagrange’ for that. What is a constrained optimisation problem? Suppose we want to maximise our own utility (our enjoyment) but have a limited amount of resources (time and money, say) we can use to do that. Or say I want to … Read More

Discovering and Curating Data on Data.World

Jessica YungData Science

To solve problems – particularly if you want to use statistical approaches or AI – you need data. Data is evidence or descriptive information. We usually deal with quantitative data or quantitative representations of e.g. text or images because they are easier to handle. The good news is there’s tons of data out there. The bad news is it’s often hidden … Read More

What is a Game Theoretic Best Choice? Part I

Jessica YungEconomics, Uncategorized

The aim of this series is to come up with some formalisation of what a game theoretic best choice is without reference to established results before the material is covered in lectures. I will then compare my formalisation to established results. Notation In Dr. Elliott’s lectures we defined a Nash Equilibrium to be when for all and for all . stands … Read More

Analyse Text and CSVs easily with DataBasic.io

Jessica YungData Science

In today’s post I’m going to explore a fun data analysis tool for beginners – DataBasic.io. I had a great time trying it out – you should have a go too! DataBasic performs simple but insightful operations on data. No technical expertise (beyond being able to navigate a webpage) is required. DataBasic comprises three tools to help you understand textual and … Read More

Machine Learning in Trading – Project Takeaways

Jessica YungData Science

People have used machine learning in trading for decades. Hedge funds, high-frequency trading shops and sole traders use all sorts of strategies, from Bayesian statistics to physics related strategies. In my final project for Udacity’s Machine Learning Nanodegree, I investigating using machine learning in trading stocks, specifically to predict British Petroleum (BP) stock prices on the London Stock Exchange (LSE) … Read More

Unit Tests and Doctests in PyCharm

Jessica YungProgramming

Yesterday I thought it was finally time to try an IDE (Integrated Development Environment. I downloaded PyCharm Community (free) which many friends use and recommend. What’s an IDE? An IDE in an integrated development environment. It contains tools that make developers’ lives easier. PyCharm, an IDE for Python, contains a source code editor with code refactoring, build automation tools, a debugger, … Read More

Social decision rules and Condorcet’s Jury Theorem

Jessica YungEconomics

Thoughts from Microeconomics Lecture 1, Cambridge Economics Part IIA (Michaelmas) Social decision rules Dr. Elliott introduced four social decision rules in this lecture. Social decision rules are rules by which a society collectively makes decisions, e.g. whether or not they should exit a union. The four decision rules introduced were Majority Rule (get >50% of the vote to win), Super … Read More