Author Question: The impurity of a group of observations is based on the variance of the outcome value for the ... (Read 59 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?

Signs and symptoms that may signify an eye tumor include general blurred vision, bulging eye(s), double vision, a sensation of a foreign body in the eye(s), iris defects, limited ability to move the eyelid(s), limited ability to move the eye(s), pain or discomfort in or around the eyes or eyelids, red or pink eyes, white or cloud spots on the eye(s), colored spots on the eyelid(s), swelling around the eyes, swollen eyelid(s), and general vision loss.

Did you know?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Did you know?

A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

For a complete list of videos, visit our video library