Statistics IV - Formula and Graphs Flashcards Preview

Mei:CogSci Semester 2 > Statistics IV - Formula and Graphs > Flashcards

Flashcards in Statistics IV - Formula and Graphs Deck (20):
1

What is the formula for the covariance of variables x and y?

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2

What is the formula for the correlation of variables x and y?

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3


What is the formula for the z-score of x?

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4


What's the formula for the mean-centred variable?

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5


What's the formula for linear regression?

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6


Explain all variables in this formula:

 

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x ... independent variable

y ... dependent variable

ß0 ... y-intercept

ß1 ... slope

epsilon ... error

7

In linear regression: What consists of ß0 and ß1?


coefficient of regression

8


The regression line always fits through the _______ of both variables.

The regression line always fits through the means of both variables.

 

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9


What's the formula for the slope of a linear regression?

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10


What's the formula for the y-intercept of a linear regression?

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11


In linear regression: What's the formula for Var(epsilon) and where can we derive this formula from?

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12


What's the formula of the coefficient of determination in linear regression?

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13

What is the mathematical connection between correlation and coefficient of determination?

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14


Four examples of how a regression can look like:

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15


How does a log function / Sigmoid-curve look like?

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16

How could a two point regression look like?

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17


Simply put, what is the formula for variance?


x = 1/n * ∑ (xi - xˉ)²

18


Simply put, what is the formula for standard deviation?


Sx = √(Sx²)

19



Simply put, what is the formula for correlation?


rxy = Sxy / SxSy

20


Simply put, what is the formula for covariance?


Sxy = 1/n*∑(xi - x¯)(yi - y¯)