correlation

correlation : In statistics, the interclass correlation (or interclass correlation coefficient) measures a bivariate relation among variables. The Pearson correlation coefficient is the most commonly used interclass correlation. The interclass correlation contrasts with the intra class correlation...   More from Wikipedia

correlation : In probability, a correlation inequality is one of a number of inequalities satisfied by the correlation functions of a model. Examples include:..   More from Wikipedia

correlation : In probability theory and statistics, correlation, also called correlation coefficient, indicates the strength and direction of a linear relationship between two random variables. See also: Computers & Math Statistics Information Technology Mathematical Modeling In general statistical usage, correlation or co-relation refers to the departure of two variables from independence, although correlation does not imply causality. In this broad sense there are several coefficients, measuring the degree of correlation, adapted to the nature of data.. For more information about the topic Correlation, read the full article at Wikipedia.org, or see the following related articles: Random variable — A random variable is a mathematical function that maps outcomes of random experiments to numbers. It can be thought of as the numeric result of ...  > read more Probability distribution — In mathematics and statistics, a probability distribution, more properly called a probability density, assigns ....   More from Science Daily

  Covariance is a measure of relationship (or co-movement) between two variables. Correlation is just the translation of covariance into a UNITLESS measure that we can understand (-1.0 to 1.0)

  Correlation between variables

Question : i have to sets of results, one class 2 results and the other class 3 results, and i want to see the correlation between them. i want to see if class2 results is a good indicator for the class 3 results. do i use scatter diagram or cumulative frequency

Answer : If the two classes contain different students, then you have no basis for comparison. To get a correlation, you would need two scores for each student -- one score for Class 2 and the other score for the same student in Class 3. You would use a scattergram to visualize the relationship and correlation to quantify it. Looking at the frequency distribution would tell you if average and extreme scores are similar between the two classes, but not if there is a relationship...   More from Yahoo Answers

Question : I'm looking at economic papers for school and in the paper they found a coefficient to show a correlation, and then divided it by the standard deviation (or the other way around, I forget) to get the t-statistic. So apparently the larger the t-statistic the more accurate the correlation found. So does this mean a higher standard deviation means a weaker correlation?

Answer : No. Note that they're not looking at correlation as such, they're looking at regression coefficients. In this case, a higher standard deviation just means that you're less sure about the value of the coefficient, and so it is harder to reject the null hypothesis that states that the coefficient is zero...   More from Yahoo Answers