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30 Cards in this Set
 Front
 Back
Correlation
definition 
Numerical statement about the strength of a relationship between 2 invervallevel variables


Positive Correlation
definition 
Variables move in the same direction (increasing or decreasing)


Negative Correlation is also known as...

Inverse correlation


Negative Correlation
definition 
When 1 variable increases, and the other decreases


Correlation coefficient ranges from...

1 to +1


A no correlation coefficient has  value.

0.00


Scattergram
definition 
A graphical representation of cases showing simultaneously their values on 2 different variables.


Abscissa
definition 
Horizontal axis,
Xaxis, has the independent variable 

Ordinate
definition 
Vertical axis,
Yaxis, has the dependent variable 

The Dependent variable is called the...

Criterion Variable


The Independent variable is the ...

Predictor variable


Perfect Correlation
definiiton 
Data has a 1.00 correlation


When there is a perfect correlation ...

You are have total and complete prediction.
There is No unexplained variation between the variables. 

Regression Line is also known as ...

Line of Best Fit


Regression Line
definition 
An imaginary line that can be drawn through All of the data points


A regression line is drawn in what kind of correlation?

Perfect Correlation


Partial Correlation
definition 
When you statistically control for the extranewous ones by a correlational procedure


Partial correlation produces...

A correlation coefficient that allows you to guage the strength of relationship that other variables may be exerting


When should outliers be excluded from data analysis?

Whenever the outliers are clearly "oddball" cases that seem to be anomalies


If you exclude some oddball cases you should...

report it to the study


Coefficient of Determination
definition 
Indicates how much variation within the 2 variables can be explained


Example of coefficient of Determination statement

From the sample of data obtained, we can explain % of the variation


Is a insignficant correlation reliable?

Not very reliable


What does a signficance level depend on?

It depends on the sample size and whether the data fit a general linear pattern


3 Basic Assumptions/Conditions

1)Data shoudl be measured at the interval level
2) Data should be reasonably linear 3) Variances in x and y should be relatively similar 

Curvilinear
definition 
OShaped, UShaped, Jshaped, or SShaped


Curvilinear is also known as...

Heteroscedastic


Spearman's rho

Differences are the values that Spearman's rankorder correlation coefficient uses ot quantify the agreement between the 2 raters


Correlation Matrix
definition 
Need to compute more than 1 correlation coefficient


Regression Equation
definition 
A formula expressing a linear relationship
Y = a + bX 