https://www.codepaws.com/courses/ Recent content in Courses on Codepaws Hugo -- gohugo.io Sat, 30 Jun 2018 00:00:00 +0000 https://www.codepaws.com/courses/data_science/introduction_to_r/ Sat, 30 Jun 2018 00:00:00 +0000 https://www.codepaws.com/courses/data_science/introduction_to_r/ R Basics Assignment x <- 1 Printing to screen print(x) # or just x Creation of an integer sequence Vector of values 1 to 20 x <- 1:20 Objects / Data Types R has five basic atomic objects Character Number NaN - Not a number Inf - Infinity Integer Integers need to be specifically created as R will by default create a number. This can be done by using the suffix L. https://www.codepaws.com/courses/data_science/data_science_introduction/ Fri, 29 Jun 2018 00:00:00 +0000 https://www.codepaws.com/courses/data_science/data_science_introduction/ Types of Data Science Questions Descriptive Describe a set of data Commonly applied to Census data (example describing the population). Its not trying to infer anything Exploratory Find relationships you don’t know about Exploratory analysis alone should not be used for generalising / predicting Correlation does not imply causation Inferential Use a relatively small sample of data to say something about a bigger problem Estimation of both the quality and uncertainty around your estimate Predictive To use the data on some object to predict values for another object If X predicts Y it does not mean that X causes Y More data and simple models tend to work well Prediction is hard - especially when it involves the future Causal To find out what happens to one variable when you make another variable change Generally done through randomised studies Generally an average effect Mechanistic Using the exact changes in variables that leads to changes in other variables for individual objects Incredibly hard to infer What is Data “Data are values of qualitative or quantitative variables, belonging to a set of items” https://www.codepaws.com/courses/data_science/installation/ Fri, 29 Jun 2018 00:00:00 +0000 https://www.codepaws.com/courses/data_science/installation/ Process of setting up Rstudio on a new machine Install the R interpretor from The Comprehensive R Archive Network (CRAN). Select a mirror close to you. Download the correct binary for your OS. When running through the installer, if unsure just use the defaults. Install the RStudio IDE Launch the IDE - you maybe asked to supply the path to R. Install the devtools. The RStudio up to date instructions are here.