DMBI notes #1

Dated 12-1-2017

Data explanation

• Data objects-
• Attribute

Types of attribute

1) Nominal-

examples

1. Maritial status
2. Nominal

2) Binary attribute

• Binary symmetric attribute
• Binary asymmetric attribute

3) Ordinal attribute

- used to take feedback from the user

For example-

1. Not satisfied
2. Somewhat satisfied
3. Neutral
4. Satisfied
5. Very satisfied

• Values having order among them

4) Numeric attribute

• Internal scaled attribute
• Ratio scaled attribute

Measuring the central tendancy of data.

1. Mean
2. Medin
3. Mode

Measuring the dispersion of data

1. Range
2. Quantiles
3. Quartiles
4. Percentiles
5. Inter quartile range(IQR)