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Unformatted text preview: STA 6127 – Homework 6-7 – Due April 18 Part 1: Logistic Regression – Sexual Activity among Red Cedars Multiple logistic regression models were fit to determine whether the presence of sexual activity of Juniperus Virginiana growing in natural cedar woodland and managed parkland in northern Alabama was related to any of the following independent variables: • DBH – Diameter at breast height (cm) • SHADE1 – 1 if more than 75% covered by crowns of surrounding trees, 0 if not • SHADE2 – 1 if 25%-75% covered by crowns of surrounding trees, 0 if not • SITE – 1 if mountainside stand, 0 if parkland stand Note that SHADE1 and SHADE2 are dummy variables comparing highly covered trees with low covered trees (0-25%), and comparing moderate covered trees with low covered trees, respectively. SITE compares mountainside to parkland stands. Letting π(•29 denote the probability that a tree has sexual activity for a set of predictors • , The following models were fit: SITE DBH SITE SHADE SHADE DBH SITE DBH SITE SHADE SHADE DBH SITE DBH SITE SHADE SHADE DBH SITE SHADE SHADE DBH SITE...
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This note was uploaded on 01/20/2012 for the course STA 6127 taught by Professor Mukherjee during the Spring '08 term at University of Florida.
- Spring '08