Date: 23 January 2021 Recently, I received an image, saying the Covid-19 test accuracy for positive cases is 93% and that for negative case is 99%. Does it say anything good or bad about the Covid-19 test? Are 93% and 99% good? Or is it bad that the test missed
data analysis
Date: 06 Jan 2021 Recently, I am preparing the launch of Tableau in my company. I have, therefore, collected some useful resources and want to share with my readers. General Learning Path 1. Understand the terminology used in Tableau 1. You may refer to this link. 2. Understand the Tableau
data analysis
Date: 31 Dec 2020 Like most of you, when I tried to explore the career in data field, I want to be a data analyst. It is the sexiest job in 21st Century (according to Harvard Business Review. [an article titled: Data Scientist: The Sexiest Job of the 21st Century]
stocks
Date: 20 December 2020 Short answer: No, but better. To answer a question, we always start by making some assumptions, including Starting Salary, Inflation Rate, Salary Growth Rate, Salary Growth Rate, Expense Ratio, and Return on Investment. I am putting this calculation in the Hong Kong context and a typical
models
date: 6 Dec 2020 I will share what I know and some thoughts on developing credit risk model. Expected Loss The reason why expected loss is calculated is to determine how much capital a bank/Financial Institution (FI) should hold. The expected loss is not the only factor in determining
Date: 29 November 2020 What do I want to achieve in the year 2021? Since the year 2018, I gave myself 3 goals per year. And, I spend my best time (in the morning) to achieve those goals. So far, this approach is very effective in achieving goals. But, when
Date: 8 November 2020 As we near the end of the Year 2020, it is time to reflect on the goals set at the beginning of the year. Reflection is vital as Albert Einstein said: We cannot solve our problems with the same thinking we used when we created them.
Date: 4 October 2020 (while I am struggling to not spending money on useless items) If I have an infinite amount of money, I don’t need to spend less. But before I reach that level (just kidding for an infinite amount of money. But I can be rich enough
efficiency
Date: 3 October 2020 How many news apps are installed on your phone? I used to have many. Every day, you will receive hundreds of notifications telling you what you should read now. I don’t like being passively fed with information that I don’t really care. So, I
Date: 3 October 2020 I have been asked many times, which brokerage firm you use? The short answer is I use Interactive Brokers (Disclaimer: No affiliation). But the underlying question is what are the benefits of using the brokerage firm you are using. I can only share my experience with
In #7, I have talked about choosing the adjusted R square as the error metric. In this article, I am going to summarize the features of K nearest neighbour model, the simplest model to use in predicting house price. The reason I want to use KNN is just that it
In #6, I have talked about building a Minimum Viable Product (MVP). In this post, I am going to discuss the different matrices to evaluate a regression model and my choice for the problem. NOTATIONS * n is the number of testing samples. * y_i is the i th predicted value.