Chaoran Liu

Chaoran Liu

A data science enthusiast

Recent posts

Job Hunting Like A Data Analyst (Part I)

6 minute read

Motivation: I’m currently suffering a tough time in looking for a data analyst job. Instead of doing it in a traditional way, I am thinking why not do the job hunting just like a data analyst, by making use of the advantages of data science. Always, the first step to flight a battle is to know your enemy. As I’m looking for a job in Singapore/China, the first thing I would like to explore is the job market in these areas. I’m interested to know about: Who is hiring data analyst Which ...

Review on Stanford Machine Learning Course

5 minute read

I have been signed up for this course for a long time. And since last week, I finally managed to complete it with a good score. This course is taught by Andrew Ng, who is also the co-founder of Cousera. The content of the course spans from supervised learning to unsupervised learning, as well as some advice for the ML model improvement, special topics on pipeline setup and implementation on large scale data. I personally feel this course is very beneficial for the beginners like me. The f...

Getting Started With Tableau

2 minute read

Intro to Tableau Aspired by the course ‘Data Visualization’ offered by University of Illinois on Cousera, I have worked on the interactive data visualization using Tableau. There is a free version of Tableau Public is available and you can upload the visualization online for sharing. Tableau is one of the Business Intelligence tools that makes it easier to do with aesthetic chart plotting and interactive report generating. There are 3 main components used in Tableau: Worksheet, Dashboard an...

Recognize the Digits

2 minute read

This time I am going to demostrate the kaggle 101 level competition - digit recogniser. We are asked to train a model to recogize the digit from the pixel data in this competition. The data set is available here. description of the data: label: the integers from 0 - 9; features: pixel001-pixel784, which are rolled out from 28x28 digit image; pixel data is ranged from 0 -255, which indicating the brightness of the pixel in grey scale; Visualize the digit: Let’s randomly look at 100 dig...

Spatial Visualization with ggmap R package

3 minute read

ggmap, which is an R package built to visualize with map, is very similar to ggplot2. And its output is ‘ggplot’ class, which means it also support layered visualization just like ggplot2. I will demonstrate with two examples “Crimes in San Fransisco” and “Taxi in Porto”. The data of both examples are taken from kaggle. some basics of ggmap: get_map: is the function to download map from source (e.g. google/openstreetmap). some parameters can play with: location: the longitude and the...