ISYE 6501 Midterm UPDATED ACTUAL Questions and CORRECT Answers
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Course
ISYE 6501
Institution
ISYE 6501
ISYE 6501 Midterm UPDATED ACTUAL
Questions and CORRECT Answers
What does SVM stand for? - CORRECT ANSWER- Support Vector Machine
Is written text structured or unstructured? - CORRECT ANSWER- Unstructured
When we increase the sum of the square of the coefficients we... - CORRECT ANSWERDecrease ...
ISYE 6501 Midterm UPDATED ACTUAL
Questions and CORRECT Answers
What does SVM stand for? - CORRECT ANSWER- Support Vector Machine
Is written text structured or unstructured? - CORRECT ANSWER- Unstructured
When we increase the sum of the square of the coefficients we... - CORRECT ANSWER-
Decrease the distance between the lines
In SVM soft classifier we tradeoff between maximizing ___ and minimizing ___ -
CORRECT ANSWER- margin and errors
If lambda gets small what gets emphasized, large margin or minimizing training error?, -
CORRECT ANSWER- Minimizing errors.
What is a support vector? - CORRECT ANSWER- A point that holds up a shape.
Does ...[⅔(a-1)+1/3(a+1)] move an SVM classifier up or down? - CORRECT ANSWER- Up
How do you make errors more costly in a soft SVM classifier? - CORRECT ANSWER-
include a multiplier for the point-error term.
If an SVM coefficient is very close to zero... - CORRECT ANSWER- that term is not very
important to the classification.
What is the difference between standardization and scaling? - CORRECT ANSWER- Scaling
is bounded in range. Standardization is scaling to a normal distribution. Standardization is the
(value - factor mean) / (factor standard deviation)
What is the 2-norm? - CORRECT ANSWER- Euclidean distance
What is the 1-norm? - CORRECT ANSWER- The rectilinear (Manhattan) distance
,What is the infinity norm? - CORRECT ANSWER- The value of the largest dimension
Measuring the quality of a model is called? - CORRECT ANSWER- Validation
What does a confusion matrix show? - CORRECT ANSWER- The performance of a
classification model.
A time series outlier that seems "off the curve" is called a... - CORRECT ANSWER-
contextual outlier.
A data element that is different from all other data in a set is called a... - CORRECT
ANSWER- point outlier.
When something is missing in a range of points - CORRECT ANSWER- it is called a...,
collective outlier.
The whiskers on a box plot extend to... - CORRECT ANSWER- the 10th and 90th percentiles
(or 5th and 95th)
Why are hypothesis tests generally not sufficient for change detection? - CORRECT
ANSWER- They are slow to detect changes.
In CUSUM, T is _____ and C is _____., - CORRECT ANSWER- Threshold and a "bring
down factor"
In a CUSUM model, you adjust T and C to manage the tradeoff between..., - CORRECT
ANSWER- early detection and false-alarms
In exponential smoothing, if the data is less random, then you want to pick an alpha that is...,
- CORRECT ANSWER- Close to 1.
What is the initial condition for T in exponential smoothing with trending? - CORRECT
ANSWER- T_i=0
, In cyclic exponential smoothing, L represents..., - CORRECT ANSWER- The length of the
cycle or season
In cyclic exponential smoothing, C_1 ... C_L = ___?, - CORRECT ANSWER- 1. In other
words, initialize it to no initial cycle.
Exponential, trending and cyclic smoothing are also referred to as - CORRECT ANSWER-
single double and triple.
Triple smoothing is also known as? - CORRECT ANSWER- Winter's or Holt-Winter's
What is the optimization formula for Exponential Smoothing? - CORRECT ANSWER-
min(F_t-Xt)^2 where alpha and beta are between 0 and 1.
ARIMA stands for? - CORRECT ANSWER- Autoregressive Integrated Moving Average
Exponential smoothing is an order ___ autoregressive model. - CORRECT ANSWER-
Infinity. It uses data going all the way back.
For ARIMA, the D parameter is used to specify ___. - CORRECT ANSWER- , The order, or
the differences of the differences of the differences (d-times.)
For ARIMA, the P parameters is used to specify ____., - CORRECT ANSWER- The order of
periods (autoregression).
For ARIMA, the Q parameter is used to specify ______., - CORRECT ANSWER- The order
of the moving average.
ARIMA(0,1,1) is ?, - CORRECT ANSWER- Exponential smoothing.
What is the order of the ARIMA parameters? - CORRECT ANSWER- p d q
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