(O - E) 2 /E
To determine the chi-square value we will use an interactive web application or a
Calculate Yule's Q
Use the observed frequencies. A value close to +1 indicates a strong positive rela-
tionship between the independent and the dependent variables.
Yule's Q = ______________
a, b, c, d stand for cells in the observed frequency table
When you are finished, answer these questions.
1. How strong is the relationship between precipitation and forests in Minne-
2. What factors explain the values?
3. What other factors should be considered?
4. What problems do you see in the procedure for this exercise? Are the quad-
rants a good size for this analysis?