SAS A00-240 Exam Practice Test Instant Access

Question 1

Refer to the ROC curve:

As you move along the curve, what changes?

AThe priors in the population

BThe true negative rate in the population

CThe proportion of events in the training data

DThe probability cutoff for scoring

Answer : D

Question 2

Given the following SAS data set TEST:

Which SAS program is NOT a correct way to create dummy variables?

AOption A

BOption B

COption C

DOption D

Answer : D

Question 3

PROC GLMSELECT was used for building a model predicting the natural log of a baseball player's salary from certain performance and longevity statistics. The model used backward elimination using SBC as its selection criterion. The sequence of steps is summarized in the graphic shown below:

At Step 9 number of at bats (nAtBat) was removed from the model.

Why was it removed?

ARemoving nAtBat had the largest effect on the parameter estimate of nHits.

BThe p-Value for nAtBat was largest.

CRemoving nAtBat yielded the largest improvement to SBC.

DThe p-Value for nAtBat was smallest.

Answer : B

Question 4

Spearman statistics in the CORR procedure are useful for screening for irrelevant variables by investigating the association between which function of the input variables?

AConcordant and discordant pairs of ranked observations

BLogit link (log (p/1-p))

CRank-ordered values of the variables

DWeighted sum of chi-square statistics for 2x2 tables

Answer : C

Question 5

Including redundant input variables in a regression model can:

AStabilize parameter estimates and increase the risk of overfitting.

BDestabilize parameter estimates and increase the risk of overfitting.

CStabilize parameter estimates and decrease the risk of overfitting.

DDestabilize parameter estimates and decrease the risk of overfitting.

Answer : B

Question 6

Refer to the following odds ratio table:

What is a correct interpretation of the estimate?

AThe odds of the event are 1.142 greater for each one dollar increase in salary.

BThe odds of the event are 1.142 greater for each one thousand dollar increase in salary.

CThe probability of the event is 1.142 greater for each one dollar increase in salary.

DThe probability of the event is 1.142 greater for each one thousand dollar increase in salary.

Answer : B

Question 7

A confusion matrix is created for data that were oversampled due to a rare target.

What values are not affected by this oversampling?

ASensitivity and PV+

BSpecificity and PV-

CPV+ and PV-

DSensitivity and Specificity

Answer : D

SAS Statistical Business Analysis SAS9: Regression and Model A00-240 Exam Practice Test