data

Representation of information in a formalised manner suitable for communication, interpretation, or processing by humans or by automatic means.

⇒ semanticity

Logistic regression:

$$\frac{1}{1+e^{-(x-\mu )/s}}$$

• schema + relational.

theory

See also database

types.

nominal data

• qualitative data
• mutually exclusive
• cannot be ranked
• $=\ne \in \notin$

ordinal data

• represents categories
• $=\ne \in \notin ><$

time-series data (interval)

• no true zero
• $=\ne ><+-$

ratio data

• $=\ne ><+-\times \%$

dimensionality