Author Question: The impurity of a group of observations is based on the variance of the outcome value for the ... (Read 65 times)

fox

  • Hero Member
  • *****
  • Posts: 540
The impurity of a group of observations is based on the variance of the outcome value for the observations in the group for
 a. regression trees. b. time-series plots.
  c. classification trees. d. cumulative lift charts.

Question 2

In which of the following scenarios would it be appropriate to use hierarchical clustering?
 a. When the number of observations in the dataset is relatively high.
  b. When it is not necessary to know the nesting of clusters.
  c. When the number of clusters is known beforehand.
  d. When binary or ordinal data needs to be clustered.



huda

  • Sr. Member
  • ****
  • Posts: 304
Answer to Question 1

a
RATIONALE: For regression trees, the impurity of a group of observations is based on the variance of the outcome value for the observations in the group.

Answer to Question 2

d
RATIONALE: If one has a small data set and want to easily examine solutions with increasing numbers of clusters, one may want to use hierarchical clustering. Hierarchical clusters are also convenient if one want to observe how clusters are nested. k-means clustering partitions the observations, which is appropriate if trying to summarize the data with k average observations that describe the data with the minimum amount of error. Because Euclidean distance is the standard metric for k-means clustering, it is generally not as appropriate for binary or ordinal data for which an average is not meaningful.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

Did you know?

The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

Did you know?

Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.

Did you know?

The average adult has about 21 square feet of skin.

Did you know?

Excessive alcohol use costs the country approximately $235 billion every year.

For a complete list of videos, visit our video library