and Types of Data
especially facts or numbers collected for decision making is called data. Data
may be numerical or categorical. Data may also be generated through a variable.
Variable: A variable is an entity that
varies from a place to place, a person to person, a trial to trial and so on. For
instance the height is a variable; domicile is a variable since they vary from
person to person.
variable is said to be quantitative if it is measurable and can be
expressed in specific units of measurement (numbers).
variable is said to be qualitative if it is not measurable and
cannot be expressed in specific units of measurement (numbers). This variable
is also called categorical variable.
variable height is a quantitative variable since it is measurable and is
expressed in a number while the variable domicile is qualitative since it is
not measured and is expressed as rural or urban. It is noted that they are free
from units of measurement.
data (variable are measurements that are collected or recorded as a number.
Apart from the usual data like height, weight etc.,
data are measurements that cannot be measured on a natural numerical scale. For
example, the blood types are categorized as O, A, B along with the Rh factors. They can only be classified into
one of the pre assigned or pre designated categories.