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It is necessary to understand sampling techniques before data for a sample is gathered for analysis. Some of the terms that are important arePopulation – This is the complete set under consideration. For example a survey of food choices for a country might consider all citizens of the country.Frame – frame is the population where … Read more
Discrete variables – Discrete variable take a set of values. for example, type of card drawn from a pack of cards can take any of the four values: hearts, spades, clubs or diamonds.Continuous values – These can take any values within a specified range. For example height of students in a class can take any … Read more
In this post i will discuss the measures of shape used for statistical analysis, specifically skewness and kurtosis. I will also discuss the box and whisker plot. Skewness – A normal distribution is a bell curve that is perfectly symmetric. perfect symmetry implies that the values are distributed equally around the center. a graph is … Read more
In this post we look at descriptive statistics as a means for data exploration. Descriptive analysis refers to a group of methods that gives summary information about the data. For example consider the sales figures for a retail clothes outlet. An important figure would be the average of sales for a particular day of the … Read more
An understanding of Statistics is imperative before delving into the tools and methods of business intelligence and analysis. We will spend some time on understanding the basics of Statistics for data analysis and in subsequent posts try to give more detailed explanation of the various methods involved.Statistics for data analysis can be broadly divided into … Read more
Any company wishing to reap the benefits of business analytics needs to understand the path that it has to take to reach the goal of optimization. Stage 1 : The first stage is reporting and data analysis. This essentially means that you gather the data from your source systems and run reporting tools on it. … Read more
Information is required at all levels in the organization. Right from the CEO,CFO or CIO to a technician, everyone in the organization can benefit from access to information. The kind of decision that they make may differ and the granularity of information required may vary but the same system should be able to serve the … Read more