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ISYE 6501 MIDTERM EXAM 2024/2025
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ISYE 6501 MIDTERM EXAM 2024/2025
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ISYE 6501 MIDTERM EXAM 2024/2025What is the 2-norm?- ANSWER ✔✔Euclidean distance
What is the 1-norm?- ANSWER ✔✔The rectilinear (Manhattan)
distance
What is the infinity norm?- ANSWER ✔✔The value of the largest
dimension
When something is missing in a range of points- ANSWER ✔✔it is
called a..., collective outlier.
The whiskers on a box plot extend to...- ANSWER ✔✔the 10th and
90th percentiles (or 5th and 95th)
Why are hypothesis tests generally not sufficient for change detection?-
ANSWER ✔✔They are slow to detect changes.
In CUSUM, T is _____ and C is _____.,- ANSWER ✔✔Threshold and
a "bring down factor"
In exponential smoothing, if the data is less random, then you want to
pick an alpha that is...,- ANSWER ✔✔Close to 1.
,What is the initial condition for T in exponential smoothing with
trending?- ANSWER ✔✔T_i=0
In cyclic exponential smoothing, L represents...,- ANSWER ✔✔The
length of the cycle or season
In cyclic exponential smoothing, C_1 ... C_L = ___?,- ANSWER ✔✔1.
In other words, initialize it to no initial cycle.
Exponential, trending and cyclic smoothing are also referred to as-
ANSWER ✔✔single double and triple.
Triple smoothing is also known as?- ANSWER ✔✔Winter's or Holt-
Winter's
What is the optimization formula for Exponential Smoothing?-
ANSWER ✔✔min(F_t-Xt)^2 where alpha and beta are between 0 and 1.
Exponential smoothing is an order ___ autoregressive model.-
ANSWER ✔✔Infinity. It uses data going all the way back.
For ARIMA, the D parameter is used to specify ___.- ANSWER ✔✔,
The order, or the differences of the differences of the differences (d-
times.)
,If lambda gets small what gets emphasized, large margin or minimizing
training error?,- ANSWER ✔✔Minimizing errors.
What is a support vector?- ANSWER ✔✔A point that holds up a shape.
Does ...[⅔(a-1)+1/3(a+1)] move an SVM classifier up or down?-
ANSWER ✔✔Up
How do you make errors more costly in a soft SVM classifier?-
ANSWER ✔✔include a multiplier for the point-error term.
If an SVM coefficient is very close to zero...- ANSWER ✔✔that term is
not very important to the classification.
Measuring the quality of a model is called?- ANSWER ✔✔Validation
What does a confusion matrix show?- ANSWER ✔✔The performance
of a classification model.
A time series outlier that seems "off the curve" is called a...- ANSWER
✔✔contextual outlier.
A data element that is different from all other data in a set is called a...-
ANSWER ✔✔point outlier.
, In a CUSUM model, you adjust T and C to manage the tradeoff
between...,- ANSWER ✔✔early detection and false-alarms
ARIMA stands for?- ANSWER ✔✔Autoregressive Integrated Moving
Average
What does SVM stand for?- ANSWER ✔✔Support Vector Machine
Is written text structured or unstructured?- ANSWER ✔✔Unstructured
When we increase the sum of the square of the coefficients we...-
ANSWER ✔✔Decrease the distance between the lines
In SVM soft classifier we tradeoff between maximizing ___ and
minimizing ___- ANSWER ✔✔margin and errors
What is the difference between standardization and scaling?- ANSWER
✔✔Scaling is bounded in range. Standardization is scaling to a normal
distribution. Standardization is the (value - factor mean) / (factor
standard deviation)
For ARIMA, the P parameters is used to specify ____.,- ANSWER
✔✔The order of periods (autoregression).
For ARIMA, the Q parameter is used to specify ______.,- ANSWER
✔✔The order of the moving average.
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