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    R^2 and r^2 in multivariate regression to exponential function

    R^2 (model fit, correlation of Y-hat with Y) is r^2 (correlation of X with Y) in "simple linear regression." I have two explanatory variables and an OLS model fitted to an exponential curve, y = ae^(b1x1 + b2x2), so I gather the two are different. Is it still possible to derive one from the...
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    Predicting on Correlated Units

    I have an OLS regression model built from independent xi- and yi-variables. The i-units are sufficiently spatially separated to be uncorrelated. The task is to use the model to predict values on a grid where the neighboring grid cells are strongly correlated in all x-variables. I have been...