8290

• UCREFRP Catalog Number: 8290
• Author: Day, K. S. and C. Crosby.
• Title: An Assessment of Young-of-the-Year Colorado Squawfish ‎(Ptychocheilus lucius)‎ Use of Backwater Habitats in the Green River, Utah.
• USFW Year: 1997.
• USFW - Doc Type: FG-33,
• Copyright Material: NO

Appendix A. Examples of models developed to test for the ability of combinatio
habitat variables to discriminate between backwaters used by Color
and those not used by Colorado squawfish in the Green River within
Utah: 1990-1996. Models were developed using stepwise discriminan
and tested for accuracy of classification using discriminant funct
Significance level for entry into models was set at pa0.15 and pri
for classification were proportionate to group frequency.
POOLED SAMPLESa
Stepwise selection:
Average
Step Variable R2 Wilks~ (Squared ~
Lambda Canonical u
Correlation ,I
1 mean width of backwater 0.1102 0.8898 0.1102 ~~
2 mean depth of backwater 0.0030 0.8872 0.1128 (~
3
l ~ surface area of backwater 0.00094 0.8863 0.1137
Classification error rate:
No Yes Total ~
Rate 0.0858 0.3929 0.1766
Priors 0.7044 0.2956
a Model for pooled samples was developed by comparison of all other models
judgement of the researchers and random testing rather than through step
discr-i~inant analysis. It is designed to be simple and as effective as
for easy application in the field.