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7 Cards in this Set
- Front
- Back
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Extrapolation
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the use of a regression line or curve for prediction outside the domain of values of the explanatory varible x that you used to obtain the line or curve......(using a curve to predict data that would not fit)
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Lurking Variable
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a variable that has an important effect on a study, but is not included in the variables studied.
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Does association ALWAYS imply causation?
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NO! an association between two variables may be strong, but doesn not necessarily mena it is the cause... ie increase ice cream sales and increase of drowning.
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Confounding
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when we are unsure whether a variable has an effect on the response. There may be more than one variable that could possibly be the cause.
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Cautions for interpreting correlation and regression
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Correlation and regression should be interpreted with caution
wathc out ofr the effects of extreme observations correlation and regression describe only linear relations avoid extrapolation |
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Two-way table
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dextribes the relationhiop between two categorical variables
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simpons paradox
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a comparision between two variables that holds for each individul value of a third variable can be chan ged or even reversed when the data for all values of the third variable are combined
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