Question

Consider the sample data
Object ID | Test1(Nominal)| Test2(Ordinal)| Test3(Numerical)
1 | Code A | Excellent| 45
2 | Code B | Fair | 22
3 | Code C | Good | 64
4 |Code A | Excellent | 28

a) Find the similarity and dissimilarity matrix for the nominal attribute and ordinal attribute.

b) Find the similarity and dissimilarty matrix for the mixed attributes: nominal, ordinal, numerical.​

Answer 1

Answer:

Data sets are made up of data objects.

A data object represents an entity.

Examples:

◦ sales database: customers, store items, sales

◦ medical database: patients, treatments

◦ university database: students, professors, courses

Also called samples , examples, instances, data points, objects, tuples.

Data objects are described by attributes.

Database rows -> data objects; columns ->attributes.

Explanation: