Analyzing results Contribution types Project videos ECE 695

Analyzing results + Contribution types + Project videos ECE 695 Alexander J. Quinn 4/22/2016

Today Choosing a statistical test p Discuss CHI contribution types p Videos p n n Tip: How to make a cheap tripod Watch and discuss CSCW and CHI videos

Key questions for any empirical evaluation 1. What are independent variables (IVs)? a. b. 2. What are dependent variables (DVs)? a. b. 3. What type? How many? Do you need to control for other factors? a) How many?

Credit: Anne Marenco, http: //www. csun. edu/~amarenco/Fcs%20682/When%20 to%20 use%20 what%20 test. pdf

The ANOVA F-test The ANOVA F-statistic compares variation due to specific sources (levels of the factor) with variation among individuals who should be similar (individuals in the sample). Difference in means large relative to overall variability Difference in means small relative to overall variability F tends to be small F tends to be large Larger F-values typically yield more significant results. How large depends on the degrees of freedom (I − 1 and N − I). Credit: W. H. Freeman and Company, 2009, http: //math. arizona. edu/~kerimar/Chapter 12. ppt – verbatim

For the remainder of class, we discussed the CHI contribution types and watched some videos from CSCW and CHI, discussing what made the videos effective (or not).