# Johns Hopkins University-Coursera Data Science Specialization

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I have completed this specialization nearly a year ago but I never wrote about it in detail. You can read more about this specialization here.

What I did learn? To ask questions to making inferences, publishing results, and more. This specialization has a focus on reproducible research and communicating results. Most courses have both quizzed and projects. I had the chance to find projects solved with totally different approaches to mine and I did learn a lot from that.

I did like it as I had no knowledge about R, and I needed to use R to complete my thesis. The courses are well structured and focused on practical applications rather than on statistical theory. At first, it was hard as I had to read a lot and write a lot code that is not needed in programs such as SPSS or Stata.

## Good points

- Self-contained courses
- Good course materials (texts and videos)
- You can study at your own pace and learn from other’s projects

## Bad points

- Assignments are partially based on peer reviewing
- Some reviewers give bad qualifications without providing details
- Good feedback should be promoted and enhanced

Here you can find R material that includes quizzes, assignments, exercises and my own tricks and functions that I created for courses contained in the specialization. This is available for educational purposes.

## Course 1 • The Data Scientist’s Toolbox

This course teaches you how to set up a Github account and sync files. No other quizzes or assignments than those related to configure and use Github

## Course 2 • R Programming

- Week 1: Overview of R, R data types and objects, reading and writing data.
- Week 2: Control structures, functions, scoping rules, dates and times.
- Week 3: Loop functions, debugging tools.
- Week 4: Simulation, code profiling.

## Course 3 • Getting and Cleaning Data

- Obtain data from a variety of sources.
- Apply the basic tools for data cleaning and manipulation.

## Course 4 • Exploratory Data Analysis

- Visual representations of data using the base, lattice, and ggplot2 plotting systems in R.
- Exploratory summaries of data.
- Create visualizations of multidimensional data using exploratory multivariate statistical techniques.

## Course 5 • Reproducible Research

- Use of R markdown.
- Integrate R code into a literate statistical program.
- Organize a data analysis so that it is reproducible and accessible to others.

## Course 6 • Statistical Inference

- Fundamentals of statistical inference.
- Assumptions and modes of performing statistical inference.

## Course 7 • Regression Models

- How to fit regression models.
- How to interpret coefficients.
- How to investigate residuals and variability.
- Special cases of regression models including use of dummy variables and multivariable adjustment.
- Extensions to generalized linear models, especially considering Poisson and logistic regression.

## Course 8 • Practical Machine Learning

- Components of a machine learning algorithm.
- Apply multiple basic machine learning tools.
- Apply machine learning tools to build and evaluate predictors on real data.

## Course 9 • Developing Data Products

- How communicate using statistics and statistical products.
- Emphasis to communicating uncertainty in statistical results.
- How to create simple Shiny web applications and R packages .

## Course 10 • Data Science Capstone

It’s the final project to obtain the certification and code won’t be uploaded to avoid plagiarism. The Web Application (Shiny) it’s working for demo purposes.

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**Reimagined Invention**.

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