sbrewer's blog

• Install R and Rcmdr.
• Refer to R Commander Installation Notes for details: http://socserv.socsci.mcmaster.ca/jfox/Misc/Rcmdr/installation-notes.html
• Import the data:
  • In Rcmdr. under “Data” menu “Import data” from “text file”
  • Set the “Field Separator” to “Commas”.
  • Navigate to the CSV file and select it.
  • Click the “Edit data set” button to open the data set in a window.
  • Make a note of all outliers (to put in the legend of the figure).
  • Click on the number of each row with an outlier, then right-click and “Delete current row”.
  • Click OK to save edited data set.
• Under “Graphs” choose “Scatterplot matrix...”
  • Select all three variables.
  • Click “Plot by groups”, select Gender, and click OK.
  • Click “Options” and select the checkbox for Least-squares line and click OK.
  • Check for outliers and repeat as necessary.
• Each student independently choose one pair of variables to report in a scatter plot
  • Choose independent and dependent variables
  • Click “Plot by groups”, select Sex, and click OK.
  • Click “Options” and select the checkbox for Least-squares line and click OK.
  • Save as PDF (use this for posters)
  • Convert to PNG (use this to post at website)
  • Post as Image: write legend that includes title, description, and reports outliers.
  • (If time available, report relevant statistics, e.g. means, linear regression, or one-way ANOVA)

GIYF and here is a book for additional assistance: https://stellmack.dl.umn.edu/sites/g/files/pua2461/f/media/_the_rcmdr_gu...

Please download this directory, unzip it, and work in your group to analyze the data: https://bcrc.bio.umass.edu/data_practice/data_practice_files.tar.gz

Figure 1. Tardigrade. Tardigrades are microscopic segmented animals. Photo by AJC1 available at: https://www.flickr.com/photos/ajc1/37884036601/ under CC BY-SA 2.0 license.

Work in pairs. Each pair should follow a link, briefly discuss, and be prepared to report on the reliability, validity, and trustworthiness of the site. How do you assess these characteristics?

• Group 1
• Group 2
• Group 3
• Group 4
• Group 5
• Group 6
• Group 7
• Group 8
• Group 9
• Group 10
• Group 11
• Group 12
• Group 13
• Group 14
• Group 15