General Homework Notes

Basic Homework Guidelines

• You are encouraged to discuss problem sets with your fellow students (and with the Course Instructor of course), but you must write your own final answers, in your own words.
• Solutions prepared ``in committee’’ or by copying someone else’s paper are not acceptable.
  
• This violates the Brown standards of plagiarism, and you will not have the benefit of having thought about and worked the problem when you take the examinations.
• All answers must be in complete sentences and all graphs must be properly labeled.

Content Guidelines

• Code:
  • All code should be hidden from the main part of the assignment: You can hide code with: knitr::opts_chunk$set(echo=FALSE) in the setup, this will make code chunks hidden in printout.
  • Code used can be attached at the end of the assignment in an R file. When you are finished with your assignment, you can run the following code to extract your code from the Rmd: library(knitr) purl("/path/to/your/homework.Rmd")
  • Code should be commented with which problem the code refers to. This can be done most easily by adding a comment to each code chunk you create.
• Graphs:

  • When creating multiple graphs try to combine ones used for the same problem. You can do this with the following code:

    library(gridExtra)
    p1 <- ggplot()
    p2 <- ggplot()
    grid.arrange(p1,p2, ncol=?, nrow=?)

    Fill the ? in with appropriate numbers.
  • Make sure graphs are labeled.
• Summaries and Tables:
  • Make sure to try and combine summaries and tables for example, if you run 9 simple regressions use the tidy() function to combine results into one table.
  • Do print the summary() of regression models, use tidy() to extract coefficients and glance() to extract model fit information.
• Overall:
  • Try to organize your work so that it is neat and concise.
  • Starting with homework 2, we will start taking off points for assignments that are extremely long and/or do not follow the above guidelines.
  and an R file may be attached with the