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30 Cards in this Set
- Front
- Back
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Correlation
-definition- |
Numerical statement about the strength of a relationship between 2 inverval-level variables
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Positive Correlation
-definition- |
Variables move in the same direction (increasing or decreasing)
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Negative Correlation is also known as...
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Inverse correlation
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Negative Correlation
-definition- |
When 1 variable increases, and the other decreases
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Correlation coefficient ranges from...
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-1 to +1
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A no correlation coefficient has -- value.
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0.00
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Scattergram
-definition- |
A graphical representation of cases showing simultaneously their values on 2 different variables.
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Abscissa
-definition- |
Horizontal axis,
X-axis, has the independent variable |
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Ordinate
-definition- |
Vertical axis,
Y-axis, has the dependent variable |
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The Dependent variable is called the...
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Criterion Variable
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The Independent variable is the ...
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Predictor variable
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Perfect Correlation
-definiiton- |
Data has a 1.00 correlation
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When there is a perfect correlation ...
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You are have total and complete prediction.
There is No unexplained variation between the variables. |
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Regression Line is also known as ...
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Line of Best Fit
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Regression Line
-definition- |
An imaginary line that can be drawn through All of the data points
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A regression line is drawn in what kind of correlation?
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Perfect Correlation
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Partial Correlation
-definition- |
When you statistically control for the extranewous ones by a correlational procedure
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Partial correlation produces...
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A correlation coefficient that allows you to guage the strength of relationship that other variables may be exerting
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When should outliers be excluded from data analysis?
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Whenever the outliers are clearly "oddball" cases that seem to be anomalies
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If you exclude some oddball cases you should...
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report it to the study
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Coefficient of Determination
-definition- |
Indicates how much variation within the 2 variables can be explained
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Example of coefficient of Determination statement
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From the sample of data obtained, we can explain --% of the variation
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Is a insignficant correlation reliable?
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Not very reliable
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What does a signficance level depend on?
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It depends on the sample size and whether the data fit a general linear pattern
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3 Basic Assumptions/Conditions
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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 |
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Curvilinear
-definition- |
O-Shaped, U-Shaped, J-shaped, or S-Shaped
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Curvilinear is also known as...
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Heteroscedastic
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Spearman's rho
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Differences are the values that Spearman's rank-order correlation coefficient uses ot quantify the agreement between the 2 raters
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Correlation Matrix
-definition- |
Need to compute more than 1 correlation coefficient
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Regression Equation
-definition- |
A formula expressing a linear relationship
Y = a + bX |
