Download Statistics

Statistica /Statistics
Statistics is a discipline that has as its
goal the study of quantity and
quality of a particular phenomenon
in conditions of uncertainty or
nondeterminism , ie not complete
knowledge of it or part of it .
The term statistics, in everyday
language, also simply indicates the
numerical results ( statistics
mentioned in the news , such as :
inflation , GDP etc . ) of a process of
synthesis of the observed data .
It makes use of the scientific
method [ 1 ] and mathematics to
study the ways in which a collective
phenomenon can be summed up
and understood . This happens
through the collection and analysis
of information about the
phenomenon studied.
Statistics is somehow linked to the theory of probability returning both in the wider context of
the theory of random phenomena , but while the probability theory deals with providing
probabilistic theoretical models or probability distributions adaptable to various real random
phenomena defining the parameters of random variable in question , the statistical part of a
random sample to describe its statistical properties , or ascend or infer the underlying
probabilistic model and the estimation of its parameters ( mean, variance , standard deviation ,
mode, median ) .
The statistical science is commonly divided into two main branches :


Descriptive statistics
inferential statistics
descriptive statistics
set of methods that concern the
collection , presentation , the
definition of a set of data
related to a population in order
to describe the characteristics
adequately. The data collected
can be classified through simple
or complex deployments : a
distribution is called " simple" if
every individual in the
population or sample is
associated with a single
character a distribution is called
a " complex " if every individual
in the population or sample are
associated with at least two
characters
inferential statistics
of method together that allow ,
relying only on the ratings
made ​on the sample , to
estimate the parameters of one
or more characters of a
population . From a
philosophical point of view ,
these are mathematical
techniques to quantify the
process of learning through
experience
mathematical statistics
is the branch of mathematics
that deals with collecting,
grouping , analyzing and
interpreting the data for certain
phenomena , and some
predictions regarding the
development of these
phenomena in the future