Statistics Definitions > Circular statistics (or directional statistics) occurs around a circle. It involves data with no true zero and has no beginning or end on the number line; Designation of high or low values is arbitrary. For example [1]:…

## Two Tailed Test: Definition, Examples

Hypothesis Testing > Two Tailed Test What is a Two Tailed Test? A two tailed test tells you that you’re finding the area in the middle of a distribution. In other words, your rejection region (the place where you would…

## Tukey Test / Tukey Procedure / Honest Significant Difference

Post Hoc Tests > Tukey Test / Honest Significant Difference What is the Tukey Test / Honest Significant Difference? Watch the video for an overview and step by step calculations: Can’t see the video? Click here. The Tukey Test (or…

## Grouped Data / Ungrouped Data: Definition, Examples

Descriptive Statistics > Grouped Data Contents: What is Grouped Data? Ungrouped data Mean of Grouped Data Watch the video for an overview and how to find the mean of grouped data: Can’t see the video? Click here. What is Grouped…

## Robust Soliton Distribution

Probability Distribution > What is the Robust Soliton Distribution? Analysis of LT (Luby transform) codes is based on the analysis of the decoding algorithm, the LT processes. Each LT code symbol is generated by randomly selecting the degree of the…

## How to Calculate Percentages: Simple Steps

Basic Statistics > How to Calculate Percentages Contents: How to Calculate Percentages with a Calculator How to Calculate Percentages with Google How to Calculate Percentages by Hand Watch the video for a couple of quick examples by hand and with…

## Skewness: Definition, Formula, Calculate by Hand, Excel

Descriptive Statistics > Skewness < < Part One: Skewed Distribution In the first part of this article, we covered the basics for left-skewed and right-skewed distributions. You also learned how the mean and median are affected by skewness. This second…

## Probability of an Impossible Event

Probability > What is the Probability of an Impossible Event? The probability of an impossible event is 0. Impossible events can’t occur. For example: What is the probability of rolling a 7 on a six-sided die? As the number 7…

## Two Way ANOVA in Excel With Replication / Without Replication

Excel for Statistics > Two Way ANOVA in Excel Contents: Two way ANOVA in Excel with Replication. Two way ANOVA in Excel without Replication. Two Way ANOVA in Excel with Replication Watch the video for the steps: Can’t see the…

## Non-Central Distribution

Probability Distributions > In general, a non-central distribution is a transformation of a normal distribution. These transformation are defined by non-centrality parameters; If a non-centrality parameter (σ) is zero they are called central distributions. If σ is anything but zero,…