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## SAS A00-226 Sample Questions:

**01. Which two statements are true regarding the use of the IMPVAR statement to create implicit variables?**

**a)**The number of IMPVAR statements cannot exceed the number of declared variables.

**b)**The IMPVAR statement is optional, but can reduce computational overhead.

**c)**The implicit variable(s) created in the IMPVAR statement cannot be directly referenced in the objective function.

**d)**The IMPVAR statement allows complex expressions to be built and referenced so they do not need to be repeated each time

**02. What is the best measure for variable selection for incremental response models?**

**a)**Weight of Evidence

**b)**Information Value

**c)**Net Information Value

**d)**Net Weight of Evidence

**03. Based upon your Time Series Exploration, you determine the series contains no trend component but it has a seasonal component that is consistent in its variance across time. Which two Exponential Smoothing models are appropriate?**

**a)**Seasonal Additive Exponential Smoothing

**b)**Winters Additive Exponential Smoothing

**c)**Simple Exponential Smoothing

**d)**Damped-Trend Exponential Smoothing

**e)**Winters Multiplicative Exponential Smoothing

**04. In mixing a compound, the amount of water that should be used in each lot depends on the temperature of the processing**

**furnace. What concept does this example illustrate?**

**a)**Multicollinearity

**b)**Interaction

**c)**Variance

**d)**Type-I error

**05. Covariate values are characteristics of experimental units that:**

**a)**restrict randomization

**b)**are continuous

**c)**are selected

**d)**are measured

**06. What will most likely increase error variance when analyzing the results of an experiment?**

**a)**Failure to model nuisance variables

**b)**Including interactions between factors

**c)**Randomly assigning treatments to cases

**d)**A large sample size

**07. What is the main purpose of incremental response models?**

**a)**to predict who is going to buy the product

**b)**to predict who is going to buy the product regardless of any promotion

**c)**to predict who is going to buy the product only when a promotion is given

**d)**to predict who is not going to buy the

**08. As the exponential smoothing coefficient decreases towards 0, what happens to the emphasis on the most recent values?**

**a)**The emphasis increases.

**b)**The emphasis decreases.

**c)**The emphasis stays the same.

**d)**The emphasis is not related to the exponential smoothing coefficient.

**09. In order to correctly interpret the Cross Correlation Function (CCF) plot, which statement is true regarding the input**

**variable in an ARMAX model?**

**a)**The input variable must be stochastic white noise.

**b)**The input variable must be deterministic white noise.

**c)**The input variable must contain a linear trend.

**d)**The input variable must contain autocorrelation.

**10. Which statement is true about Net Information Value (NIV)?**

**a)**It requires training and validation data sets.

**b)**It is used to rank the input variables.

**c)**It has a heuristic cutoff of NIV = 50.

**d)**It is preferred to the use of Net Weight of Evidence (NWOE).

## Answers:

Question: 1 | Answer: b, d | Question: 2 | Answer: c |

Question: 3 | Answer: a, b | Question: 4 | Answer: b |

Question: 5 | Answer: d | Question: 6 | Answer: a |

Question: 7 | Answer: c | Question: 8 | Answer: b |

Question: 9 | Answer: a | Question: 10 | Answer: b |

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