Business intelligence is a general term that refers to the collection, analysis, and use of data in business to make decisions. Business Intelligence Guides Data-Based Decisions Business intelligence uses computer software to analyze internal…

### Ringing the bell: Normal Bell Curve Characteristics

We are all familiar with the term “the bell curve.”  But just what does that mean?  In this article, we will answer that question and describe some of the important features of the normal bell curve, which, in statistical lingo, is called…

### Leaning curves: Skewed distribution

In a previous article, we looked at the standard normal distribution, otherwise known as the “bell” curve.  This time we will describe the non standard distribution pattern known as a skewed distribution.  In the standard normal distribution,…

### What are Non-Parametric Statistical Tests?

There are two broad categories of statistical tests:  parametric and non parametric statistical tests. In most introductory and general statistics courses, parametric tests are discussed, in particular z-tests, t-tests, analysis of variance,…

### What Is Java Programming Language?

Java is a general-purpose computer programming language specifically designed to have as few implementation dependencies as possible. It is the foundation for virtually every type of networked application and is the global standard for developing…

### The Numbers Game: Significant Digits, Rounding and Truncating

It is important for those who work with data to know and understand some of the technical aspects of numbers, both when precise measurements and rounded or estimated figures are involved. In this article, we will look at three related aspects…

### What’s in the Words: Text Analysis

While it takes human judgment to determine the usefulness of statistical analysis, analyzing quantitative data using the many statistical methods available to us is a relatively straightforward process. Analyzing qualitative data, on the other…

### The Best “Average”? That Depends.

The word “average” in layman terms is what is called the mean in statistics. But the word “average” in statistical terms can refer to any of the three measures of central tendency: mean, median and mode. As a quick review, the mean arithmetic…

### Not the Same: Correlation and Causation

When the measures of two phenomena (or factors or variables) change in relation to one another, they are said to be correlated. Sometimes, when one phenomenon changes, the other phenomenon changes because of the first one. That is, there is…

### Segmenting Data: Quartiles, Deciles, Percentiles

We often talk about the top 25% or top 10% or even top 1% of something. When we are segmenting data into percentages we commonly are talking about quartiles, deciles and percentiles. Quartiles divide the data into four parts; deciles divide…