L4 - Regression Analysis 1 Flashcards

1
Q

linear regression

A

direct association DV that must be continuous and one or more IV that can be any level of measurement, nominal, ordinal, interval, or ratio.

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2
Q

Can a regression analysis predict the DV?

A

Yes

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3
Q

Is covariance a part of correlation?

A

Yes.

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4
Q

What happens when you center the predictor ?

A

When X is centered, the intercept a equals the average value of Y.

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5
Q

What is ß?

A

standardized regression coefficient

sx is standard deviation of x

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6
Q

If there is only one predictor. What does ß equal to?

A

pearson correlation coefficient r

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7
Q

Is this an assumption of LR? The relationship between dependent variable and independent
variable is linear

A

yes

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8
Q

Is this an assumption of LR? At each level of the predictor variable(s), the variance of the
residuals is the same (homoscedasticity)

A

yes

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9
Q

Is this an assumption of LR?
- The residuals are normally distributed

A

yes

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10
Q

How should QQ look like?

A
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11
Q

How does a heavy tailed QQ plot look like?

A
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12
Q

How does a right skew QQ look like?

A
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