Analyzing numerical data validating identification numbers
Inferential statistics includes techniques to measure relationships between particular variables.For example, regression analysis may be used to model whether a change in advertising (independent variable X) explains the variation in sales (dependent variable Y).Predictive analytics focuses on application of statistical models for predictive forecasting or classification, while text analytics applies statistical, linguistic, and structural techniques to extract and classify information from textual sources, a species of unstructured data. Data integration is a precursor to data analysis, Analysis refers to breaking a whole into its separate components for individual examination.Data analysis is a process for obtaining raw data and converting it into information useful for decision-making by users.In today's business world, data analysis plays a role in making decisions more scientific and helping businesses operate more effectively.Data mining is a particular data analysis technique that focuses on modeling and knowledge discovery for predictive rather than purely descriptive purposes, while business intelligence covers data analysis that relies heavily on aggregation, focusing mainly on business information.Descriptive statistics, such as the average or median, may be generated to help understand the data.Data visualization may also be used to examine the data in graphical format, to obtain additional insight regarding the messages within the data.
Unusual amounts above or below pre-determined thresholds may also be reviewed.
Analysts may attempt to build models that are descriptive of the data to simplify analysis and communicate results.
A data product is a computer application that takes data inputs and generates outputs, feeding them back into the environment. An example is an application that analyzes data about customer purchasing history and recommends other purchases the customer might enjoy.
Once processed and organised, the data may be incomplete, contain duplicates, or contain errors.
The need for data cleaning will arise from problems in the way that data are entered and stored.