/activity02-slr

Activity 02 - Simple Linear Regression (SLR)

This activity is intended to be completed in one week - outside of class preparation work and class meetings. On our Blackboard course site you were provided with items to read, watch, and do prior to attempting this activity. Do not proceed in this activity until you have minimally:

  1. (Day 1 portion) Read ISLR Chapter 1 & Sections 2.1 - 2.2
  2. (Day 2 portion) Read ISLR Sections 3.0 & 3.1.

In this repository/directory, you should see five items:

  • README-img - a folder containing images that I am embedding within this README.md file and other files. You do not need to do anything with this.
  • .gitignore - a file that is used to specify what Git can ignore when pushing to GitHub. You do not need to do anything with this.
  • README.md - the document you are currently reading.
  • day01-fitting - a folder that contains items for you to complete during the first class meeting.
  • day02-assessing - a folder that contains items for you to complete during the second class meeting.

We will explore most of these items over this week. Before doing that, you will first make your own copy of this repository.

Optional Resources

Do you want an interactive way to check your understanding outside of class? Though not a perfect fit for our class, OpenIntro is a team of passionate stat educators focused on increasing peoples data skills. Benjamin Baumer (associate professor at Smith College), in collaboration with the OpenIntro team and others, created a series of interactive tutorials using {learnr} that follow the OpenIntro books (if you took STA 418/518 with me, you have experienced these types of tutorials before with the assigned preparation Primers). The following tutorials will provide you with an applied approach to our topics (reorganized to better correspond with our readings):

Day 1:

Day 2:

Day 1

Task 1: Forking & cloning

I forgot to include this information at the end of last week’s activity. I like to sketch/diagram processes to help me make my thoughts physical (or digital in this case) and it provides me with an opportunity to check my understanding. Over the last week, we began to practice the “Bradford STA 631 GitHub + RStudio” workflow - long name and likely unique to our current class needs. When you are working outside of STA 631, your workflow with GitHub and RStudio will likely be different than what we do here.

Blackboard icon to fork icon to clone icon to edit icon to commit icon to push icon

Blackboard icon to fork icon to clone icon to edit icon to commit icon to push icon

Or in words:

  1. I will post a link to an activity repo on Blackboard,
  2. You will make your own copy of (fork) this repo,
  3. You will create an RStudio Project and Clone this repo,
  4. You will edit and work on the activity,
  5. You will commit your changes, and
  6. You will push your changes back to GitHub.

check-in Check in

I encourage you to find a way to visualize or list out processes to help you determine if anything is missing. These do not need to be perfect and might include a lot of “it depends” scenarios. You can always include this (if it is a frequently occurring “it depends”) or make note of them in some other way.

For your preparation tasks, you were asked to create an outline of your current understanding of how to approach a simple linear regression analysis. With your neighbors for the next 5 minutes, talk through your processes.

As a class we will discuss these items:

  • What similarities did you notice?
  • Did someone have a consideration/step in their process that you had heard of before, but forgot to include in yours?
  • What changes, currently, do you plan to make to your process?

Forking

Now you will go through our GitHub + RStudio process. Read these directions first, then work through them as this is likely still new to you. Ask questions of your neighbors and Bradford as you have them.

In this GitHub repo (i.e., my repo):

  1. Click on the fork Fork icon near the upper-right-hand corner. You will be taken to a Create a new fork screen.
  2. Verify that your GitHub username is selected under Owner and that the Repository name is activity02-slr with a green check mark (this verifies that you do not already have a GitHub repository with this name).
  3. You may provide a Description if you would like. This is a way to provide some additional, more descriptive, meta information related to the things you did. I like to provide a brief description of what happened.
  4. Verify that Copy the main branch only is selected.
  5. Click on the green Create fork button at the bottom of this page.

You should be taken a copy of this repo that is in your GitHub account. That is, your page title should be username/activity02-slr, where username is replaced with your GitHub username. Directly below this, you will see the following message:

forked from gvsu-sta631/activity02-slr

You will complete the rest of this activity in your forked copy of the activity02-slr repo.

Cloning

You connected RStudio and GitHub for Day 2 of this activity. If you are experiencing issues, get a hold of me or verify that you successfully set up RStudio and GitHub to communicate by redoing this previously assigned preparation.

Read these directions first, then work through them during your second reading. Note that you will be switching between RStudio and your GitHub repo (that you previously forked) so it might be helpful to have this page open on half of your screen and RStudio open on the other half.

  1. In RStudio, click on the RStudio Project icon (the icon below the Edit drop-down menu).
  2. Click on Version Control on the New Project Wizard pop-up.
  3. Click on Git and you should be on a “Clone Git Repository” page.
  4. Back to your activity06-logistic-regression GitHub repo, click on the green Code button near the top of the page.
  5. Verify that HTTPS is underlined in orange/red on the drop-down menu, then copy the URL provided.
  6. Back in RStudio, paste the URL in the “Repository URL” text field.
  7. The “Project directory name” text field should have automatically populated with activity02-slr. If yours did not (this is usually an issue on Macs),
    • Click back into the “Repository URL” text field.
    • Highlight any bit of this text (it does not seem to matter what or how much).
    • Press Ctrl/Cmd and the “Project directory name” should now have automatically populated with activity02-slr.
  8. Browse to STA 631/Activities (assuming you followed my opinionated file structure from earlier in the semester), then click Choose.
  9. Click on Create Project.

Your screen should refresh and the Files pane should say that you are currently in your activity02-slr folder that currently has the same files and folders as your GitHub repo. If you are asked for your GitHub credentials, provide your GitHub username and your PAT (not your password).

check-in Check in

Take a moment to reflect on what is possibly your second time doing this forking process.

  • How is this process going for you? Is it “muscle memory” yet?
  • What is easier since last week?
  • What do you still need help remembering?

Task 2: One quantitative response variable and one quantitative explanatory variable

Read these directions first, then work through them.

  1. In your activity02-slr repo folder/directory, locate and click into the day01-fitting subfolder.
  2. In the day01-fitting subfolder, you will be greeted by a new README.md file. Do your best to complete the tasks/directions provide in this subfolder by our next class session.
  3. If working on this activity outside of our class meetings, remember that you can post your questions in the Teams Muddy channel. If someone else already posted what you though was muddy, add any clarification to their post and give them a “+ 1” 👍. Remember that this space is for conversations as well as posting questions. Read through your peers’ muddy posts and do your best to provide help.

The rest of this README document contains tasks/directions for the second class meeting of this week.

Day 2

In your username/activity02-slr repo, go into the day02-assessing subfolder and follow the tasks listed in the README. You will continue to work in your activity02.Rmd file that you started during Day 1 of this activity.