DEFINITION of 'Statistical Significance'
A result that is not likely to occur randomly, but rather is likely to be attributable to a specific cause. Statistical significance can be strong or weak, and is important to research in many math and sciencerelated fields, including medicine, sociology, psychology and biology. Statistical significance does not always indicate practical significance. In addition, it can be misinterpreted when researchers do not use language carefully in reporting their results.
INVESTOPEDIA EXPLAINS 'Statistical Significance'
The calculation of statistical significance (significance testing) is subject to a certain degree of error. The researcher must define in advance the probability of a sampling error (which exists in any test that does not include the entire population). Sample size is an important component of statistical significance in that larger samples are less prone to flukes. Only random, representative samples should be used in significance testing.
The level at which one can accept whether an event is statistically significant is known as the significance level or pvalue.

PTest
A statistical method used to test one or more hypotheses within ... 
Representative Sample
A subset of a statistical population that accurately reflects ... 
Stepwise Regression
The stepbystep iterative construction of a regression model ... 
Nonparametric Statistics
A statistical method wherein the data is not required to fit ... 
Statistics
A type of mathematical analysis involving the use of quantified ... 
Multiple Linear Regression  MLR
A statistical technique that uses several explanatory variables ...

What is a relative standard error?
In statistics, a relative standard error, or RSE, is equal to the standard error of a survey estimate divided by the survey ... Read Full Answer >> 
How do you calculate the geometric mean to assess portfolio performance?
The geometric mean is used to calculate the central tendency of a set of numbers. It is the average of the logarithmic values ... Read Full Answer >> 
What is the difference between a simple random sample and a stratified random sample?
Simple random samples and stratified random samples differ in how the sample is drawn from the overall population of data. ... Read Full Answer >> 
What are the advantages and disadvantages of using systematic sampling?
As a statistical sampling method, systematic sampling is simpler and more straightforward than random sampling. It can also ... Read Full Answer >> 
What is the difference between the standard error of means and standard deviation?
The standard deviation, or SD, measures the amount of variability or dispersion for a subject set of data from the mean, ... Read Full Answer >> 
What level of correlation among investments will guarantee market returns but have ...
The efficient frontier set forth by modern portfolio theory (MPT) can provide an estimate of an optimal portfolio that allows ... Read Full Answer >>

Investing Basics
What Are The Odds Of Scoring A Winning Trade?
Just because you're on a winning streak doesn't mean you're a skilled trader. Find out why. 
Investing Basics
Regression Basics For Business Analysis
This tool is easy to use and can provide valuable information on financial analysis and forecasting. Find out how. 
Active Trading
The Linear Regression Of Time and Price
This investment strategy can help investors be successful by identifying price trends while eliminating human bias. 
Fundamental Analysis
What is Quantitative Analysis?
Quantitative analysis refers to the use of mathematical computations to analyze markets and investments. 
Fundamental Analysis
Understanding the Simple Random Sample
A simple random sample is a subset of a statistical population in which each member of the subset has an equal probability of being chosen. 
Economics
What is Systematic Sampling?
Systematic sampling is similar to random sampling, but it uses a pattern for the selection of the sample. 
Fundamental Analysis
Explaining Expected Return
The expected return is a tool used to determine whether or not an investment has a positive or negative average net outcome. 
Fundamental Analysis
Explaining the Geometric Mean
The average of a set of products, the calculation of which is commonly used to determine the performance results of an investment or portfolio. 
Investing
The Labor Market Recovery’s Missing Ingredient
Job creation is running at the fastest pace since the 90s, and there is some evidence that wage growth is finally starting to accelerate, albeit modestly. 
Trading Strategies
Best Undergraduate Degrees For Day Traders
We look at some popular undergrad majors for those wanting to begin a career in the exciting world of fastpaced trading.