Transcription of Interpretation in Multiple Regression
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Interpretation in Multiple and Adjusted of parameter combinations of parameter estimates variance-covariance matrix standard errors of combinations standard error for the meanWe will use the final model from last time to illustrate these concepts. Summaries of themodel - least squares estimates with standard errors given below in parentheses: logit proportion log duration I .14 = with 44 degrees of freedomR-squared = :TheR-squaredvaluemeansthat61% ,theadjustedR-squaredisoftenusedtosummar izethefitasit takes into account the the number of variables in the model. Adjusted R-squared = 1 - Mean Square Error /Total Mean SquarewhereMeanSquareErroris 2fromtheregressionmodelandtheTotalmeansq uareisthesamplevarianceoftheresponse(sY2 2isagoodestimateifalltheregressioncoeffi cients are 0). For this example,Adjusted R-squared = 1 - ^2/ = :theinterceptinamultipleregressionmodeli sthemeanfortheresponsewhenall of the explanatory variables take on the value ,thismeansthatthedummyvariableI=0(code=1 ,whichwasthequeenbumblebees)andlog(durat ion)=0, ,withvisitsof1second,weare95%confidentth atthemeanlogit(proportionofpollenremoved )isbetween is based on 44 degrees of freedom; qt(.)
Correlation of Coefficients: (Intercept) log.duration log.duration -0.9579857 ---- I 0.2361514 -0.3860614 The correlation between something and itself is one, so this part has been omitted. Since the correlation of (b0, b1) is the same as the correlation of ( b1, b0) the table only includes the elements below the diagonal.
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