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ISYE6414 Midterm 2 Questions and Answers well Explained Latest 2024/2025 Update 100% Correct. $7.99   Add to cart

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ISYE6414 Midterm 2 Questions and Answers well Explained Latest 2024/2025 Update 100% Correct.

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The _______________ for multiple linear regression do not have constant variance. - sample residuals How much all the values in the model change when the ith value is removed is known as what? - Cook's distance The ______________ for multiple linear regression have constant variance. - error te...

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  • September 1, 2024
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ACADEMICMATERIALS
ISYE6414 Midterm 2

The _______________ for multiple linear regression do not have constant variance. - sample
residuals



How much all the values in the model change when the ith value is removed is known as what? -
Cook's distance



The ______________ for multiple linear regression have constant variance. - error terms



QQPlot and histogram are used to assess what in MLR? - normality



Residuals vs predictor are used to predict what in MLR - linearity



Residuals vs fitted values are used to assess what in MLR - constant variance and independence



Points that are far from the mean of the x's are called - leverage points



Points that are far from the mean of the x's and y's are called - Influential points



It is good practice to perform regression analysis with and without what? - outliers



What is used to quantify outliers? - Cook's distance



Cooks distance that should be investigated. - D_i > 4/n or D_i > 1 or Large D



The proportion of variability in Y than can be explained by the predictor variables. - R-Squared

, Model variables used to account for selection bias. - Controlling factors



Continuous variables are converted to ________ when there is a distinct gap in a variable distribution. -
Indicator variable



The number of degrees of freedom for a T test for the statistical significance of a MLR coefficient? -
n-p-1

.



When testing subsets of coefficients using anova command. - order matters



When can "year" be used as a qualitative variable? - If the variable is not very granular



Used to evaluate the relationship between any two qualitative variables. - Pearson Chi-squared
test



A command needed prior to running a pearson chi-squared test of qualitative variables. - table



What should you do when you have a high number of predicting variables due to a large number of
categorical variables resulting in numerous dummy variables. - Reduce the dummy variables into
groups



Which category does R choose as the baseline label when creating dummy variables with as.factor() -
The first



If you use a model without an intercept, how will interpreting coefficients be different? - No
baseline for comparison



The statistical significance of a predicting variable in a marginal and conditional models are
_____________ . - independent

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