Jingwen Zheng - page 12

R IN ACTION Review 3 - Time series (Part 1)

I learnt Time Series from “R IN ACTION” in recent days and want to extract some important points for absorbing and summarizing the knowledge[1]. In this blog, I will simply introduce the methods for creating and manipulating time series, describing and plotting them, and decomposing them into level, trend, seasonal, and irregular (error) compone...

Read more

R IN ACTION Review 2 - Getting started with graphs

This blog reviews general methods for working with graphs. We’ll begin with how to create and save graphs, then talk about how to modify the features of graph. Creating and saving graphs Creating a new graph by issuing a high-level plotting command such as plot(), hist(), or boxplot() typically overwrites a previous graph. But how to create mo...

Read more

R IN ACTION Review 1 - Data structures

During these days, I read the book “R IN ACTION” on my way to work and home. In order to strengthen my data analysis ability and facilitate our work, I decided to start from the begining. Reviewing the basic knowledge, I felt familiar and found its interests. Considering it could be useful in data science, I’d like to share them as weekly blogs....

Read more

Goals of 2017

Year 2017 is the first year in which I start my first full-time job as a data scientist. Therefore, I want to share with you some goals and expectation about this year. I try to split the goals into several parts: the goal in my work at Franprix, the technique of data science, the business analysis, the communication skill, and the improvement o...

Read more

UCSD Introduction to Big Data Week 3 review

In the blog UCSD Introduction to Big Data Week 1 & 2 review, we talked about three sources of Big Data and the characteristics of Big Data. Today, I’ll go on with it and talk about the process of data analysis and Hadoop. The Process of Data Analysis Acquire Data Acquire includes anything that makes us retrieve data including; finding, ac...

Read more