Statistical modelling/Multiple regression analysis
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Having obtained the nature of the polynomial relationship, a multiple regression model was then fitted (Stats To do this a new variable (xsucros2) was calculated as the square of the sucrose concentration (Spread → Calculate →Column…). The factor sucros was also copied into a variate xsucros so that sucrose levels could be treated as a continuous variable in the regression analysis. The output is as shown. |
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Regression Analysis →Generalized Linear Models…) to determine the parameters for the equation. 
