Linear Correlation/Regression Analysis of Forestry Models 



Table J-2: Independent and dependent variables applied to the 



linear correlation/regression analysis. Land use measures, risk assessment value, 



water yield model output, qualitative reach assessment, and 



qualitative estimates of substrate score were applied as independent variables. 



The quantitative in- stream measures were applied as dependent variables. 



Independent Variables 



Dependent Variables 



% of Watershed Harvested 

 % of Watershed in Roads 

 Sequoia risk procedure 

 H2OYWYI 



WATSED cumulative acres 

 WATSED annual WYI 

 WATSED WYID75 

 WATSED increased sediment 



* Region 1 Channel Stab. Rating 



* Change in CSR 



* WQB stream reach assessment 



* Substrate Score 



FNF suspended sediment 

 Total Suspended Solids 

 McNeil Core Sediment 

 Whitlock- Vibert box Sediment 

 Total Nitrogen (persulfate) 

 Total Phosphorus 

 Algae Growth (Chi a) 

 Bull Trout Redds 



* Region 1 Channel Stab. Rating 



* Change in CSR 



* WQB stream reach assessment 



* Substrate Score 



The Water Quality Bureau's qualitative stream reach assessment (Module E), the 

 fishery module's substrate score (Module D), and channel stability ratings were 

 examined both as independent and dependent variables. 



reaches directiy upstream from the WATSED 

 sites. (See Table J-1.) The Channel Stability 

 Rating is a qualitative method of assessing the 

 vulnerability of a stream reach to degradation if 

 increased water flow were added to the stream. 

 Whenever possible, historic CSR values are 

 researched for the same stream reach to see if 

 any major changes occurred over time. 



All pair- wise regression analyses were con- 

 ducted on twelve independent and twelve de- 



pendent variables. (See Table J-2 for the vari- 

 ables and Appendix E for the data set.) Model 

 data output in a percentage format was trans- 

 formed using an arcsine transformation. The 

 regression analyses were performed using Stat- 

 View II statistical computer program. All sig- 

 nificant relationships and accompanying statis- 

 tics are given in Table J-3. Non-significant 

 relationships were not listed. 



Flathead Basin Cooperative Program Final Report 



Page 131 



