Introduction Flashcards Preview

Biostatistics > Introduction > Flashcards

Flashcards in Introduction Deck (20)
Loading flashcards...
1

Simpson's Paradox

Aggregated data may have different outcome than when split up

2

Objective of statistics

Make an inference about a population based on information in a sample

3

Population

set of units (people, objects, or events)

4

Sample

subset of the units of a population

5

Quantitative data

numerical

6

Qualitative data

descriptive

7

ordinal data

values are ordered

8

nominal data

no particular order

9

Presenting nominal and ordinal data

frequency table

10

Proportion

# of interest / total #

11

ratio

number of interest / number not of interest

12

Pie chart useful for

relative proportions

13

sample mean

arithmetic mean

14

geometric mean

nth root of product
3root of (1 x 2 x 3 )
used when data on log scale

15

IQR

Q3 - Q1

16

Q1

1/4 * (n+1)

17

Q2

2/4*(n+1)

18

Q3

3/4*(n+1)

19

standard deviation

difference of each value from the mean. Then square it. Then add. divide by n-1. then sqroot

20

variance

standard deviation squared