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Biostatistics > Contingency Analysis > Flashcards

Contingency Analysis Flashcards

1
Q

describe the response and explanatory variables in contingency analysis

A

both are CATEGORICAL variables

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2
Q

what does a contingency analysis test

A

tests and estimates associations between categorical variables

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3
Q

what does a contingency analysis test between two categorical variables

A

whether they are independent of each other

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4
Q

does one variable in a continency test tell us about the other

A

NO - are independent

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5
Q

what is a 2 x 2 table

A

a table where there are two categorical variables with TWO levels EACH

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6
Q

what is the probability of success variable

A

p

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7
Q

what is the probability of failure

A

1 - p

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8
Q

what is the association between the probability of success and failure

A

they are mutually exclusive

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9
Q

how to calculate odds of success for a sample data set

A
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10
Q

what is an odds ratio (OR)

A

a ratio used to quantity the difference between the odds in different groups

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11
Q

how to calculate the odds ratio of a sample data set

A
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12
Q

what is the OR ratio when the odds of both groups are the same

A

1

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13
Q

what is the OR when event in first group is HIGHER than the second group

A

O1 is greater than O2

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14
Q

what is the OR when event in first group is LOWER than the second group

A

O1 < )2

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15
Q

what is a shortcut for calculating the OR ratio for the sample

A
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16
Q

how to calculate the standard error of the sample odds ratio

A
17
Q

what is the confidence interval for the ln(OR)

A
18
Q

what are two tests done under contingency analysis

A
  1. chai squared contingency test
  2. fisher’s exact test
19
Q

what does the chai squared contingency test do

A

tests the goodness of fit to the data of the null model of INDEPENDENCE of the variables

20
Q

what type of table does a chai squared contingency test usually apply to

A

2 x 2 x 3 tables

21
Q

what type of table does a fisher’s exact test usually apply to

A

2 x2 tables

22
Q

how to find expected frequencies for chai squared contingency test

A
23
Q

how to calculate test stat for chai squared contingency test

A
24
Q

degrees of freedom for chai squared contingency test

A

r = total row
c = total column

25
Q

what does the chai squared contingency test test

A

the null hypothesis of no association between variables (independent) between 2 OR MORE categorical variables

26
Q

does the fisher’s exact test give exact P value

A

YES

Biostatistics (9 decks)

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