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ISYE 6414 - Unit 2 Flashcards with complete solution
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ISYE 6414 - Unit 2 Flashcards with complete solutionISYE 6414 - Unit 2 Flashcards with complete solutionISYE 6414 - Unit 2 Flashcards with complete solutionISYE 6414 - Unit 2 Flashcards with complete solutionISYE 6414 - Unit 2 Flashcards with complete solutionISYE 6414 - Unit 2 Flashcards with comp...

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  • September 7, 2024
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ISYE 6414 - Unit 2 Flashcards with complete
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What iare ithe iassumptions ifor imultiple ilinear iregression? i- icorrect iAnswers i✔✔ i-Linearity/Mean
izero iassumption, iConstant iVariance, iIndependence iand iNormality i(for istatistical iinference)


what iare ithe imodel iparameters ito ibe iestimated iin iMLR? i- icorrect iAnswers i✔✔ i-B0 i(intercept), iB1-
Bp, iand isigma isquared

In imultiple ilinear iregression, ithe imodel ican ibe iwritten iin...? i- icorrect iAnswers i✔✔ i-Matrix iform.

design imatrix i- icorrect iAnswers i✔✔ i-a imatrix iconsisting iof icolumns iof ipredicting ivariables iincluding
ithe icolumn iof iones icorresponding ito ithe iintercept:


simple ilinear iregression i- icorrect iAnswers i✔✔ i-linear iregression iwith ione iquantitative ipredicting
ivariable


ANOVA i- icorrect iAnswers i✔✔ i-linear iregression iwith ione ior imore iqualitative ipredicting ivariables

Multiple ilinear iregression i- icorrect iAnswers i✔✔ i-multiple iquantitative iand iqualitative ipredicting
ivariables


in iMLR, ithe isampling idistribution ifor isigma^2 iis iMSE i..... i- icorrect iAnswers i✔✔ i-chi-square iwith in-p-
1 iDF

marginal imodel i(SLR) i- icorrect iAnswers i✔✔ i-captures ithe iassociation iof ione ipredicting ivariable ito
ithe iresponse ivariable imarginally, ithat imeans iwithout iconsideration iof iother ifactors.


conditional imodel i(MLR) i- icorrect iAnswers i✔✔ i-captures ithe iassociation iof ia ipredictor ivariable ito
ithe iresponse ivariable, iconditional iof iother ipredicting ivariables iin ithe imodel.


We ican imake icausality istatements ifor... i- icorrect iAnswers i✔✔ i-experimental idesigns

We ican imake iassociated istatements ifor... i- icorrect iAnswers i✔✔ i-observational istudies

, 3 iways iPredicting iVariables ican ibe idistinguished ias: i- icorrect iAnswers i✔✔ i-Controlling, iExplanatory,
iPredictive


Controlling ifactors i- icorrect iAnswers i✔✔ i-to icontrol ifor ibias iselection iin ithe isample. iThey iare iused
ias i'default' ivariables iin iorder ito icapture imore imeaningful irelationships.


Explanatory ifactors i- icorrect iAnswers i✔✔ i-to iexplain ivariability iin ithe iresponse ivariable; ithey imay
ibe iincluded iin ithe imodel ieven iif iother i"similar" ivariables iare iin ithe imodel


Predictive ifactors i- icorrect iAnswers i✔✔ i-to ibest ipredict ivariability iin ithe iresponse iregardless iof
itheir iexplanatory ipower


The iobjective iof imultiple ilinear iregression iis:



A) iTo ipredict ifuture inew iresponses

B) iTo imodel ithe iassociation iof iexplanatory ivariables ito ia iresponse ivariable iaccounting ifor
icontrolling ifactors.


C) iTo itest ihypotheses iusing istatistical iinference ion ithe imodel.

D) iAll iof ithe iabove. i- icorrect iAnswers i✔✔ i-D

2. iWhich iis icorrect?



A) iA imultiple ilinear iregression imodel iwith ip ipredicting ivariables ibut ino iintercept ihas ip imodel
iparameters.


B) iThe iinterpretation iof ithe iregression icoefficients iis ithe isame iwhether ior inot iinteraction iterms iare
iincluded iin ithe imodel.


C) iMultiple ilinear iregression iis ia igeneral imodel iencompassing iboth iANOVA iand isimple ilinear
iregression.


D) iNone iof ithe iabove. i- icorrect iAnswers i✔✔ i-C

Which iis icorrect?



A) iThe iregression icoefficients ican ibe iestimated ionly iif ithe ipredicting ivariables iare inot ilinearly
idependent.

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