BIOSTATS - Descriptive Statistics

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Descriptive Statistics

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  • Help summarize and organize data

  • Used in various fields like business, medicine, and research

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Mean

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  • The average of all values

  • Affected by outliers (non-resistant measure)

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25 Terms

1

Descriptive Statistics

  • Help summarize and organize data

  • Used in various fields like business, medicine, and research

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2

Mean

  • The average of all values

  • Affected by outliers (non-resistant measure)

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3

Median

  • The middle value when data is ordered.

  • If odd, middle number

  • If even, average of the two middle numbers

  • Not affected by extreme values (resistant measure)

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4

Mode

  • The most frequently occurring value

  • Can be unimodal, bimodal, or multimodal

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5

Measures of Central Location

  • Quartiles

  • Deciles

  • Percentiles

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6

Quartiles

Divide data into 4 equal parts (Q1, Q2, Q3)

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7

Deciles

Divide data into 10 equal parts (D1-D9)

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8

Percentiles

Divide data into 100 equal parts (P1-P99)

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9

Range Formula

Maximum - Minimum

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10

Interquartile Range (IQR) Formula

Q3 - Q1

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11

Mean Absolute Deviation (MAD)

Average absolute differences from the mean

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12

Variance

Average squared difference from the mean

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13

Population Variance Formula

σ2

<p><span>σ</span><sup>2</sup></p>
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14

Simple Variance Formula

s2

<p><span>s</span><sup>2</sup></p>
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15

Standard Deviation (SD) Formula

σ2

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16

Coefficient of Variation (CV)

σ/x x 100

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17

Z-Score Formula

x - mean / SD

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18

Skewness

Describes asymmetry in data distribution

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19

Negative Skew

  • Tail on the left

  • mean < median

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20

Zero Skew

  • Symmetric distribution

  • mean = median = mode

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21

Positive Skew

  • Tail on the right

  • mean > median

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22

Kurtosis

Describes the peakness of a distribution

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23

Leptokurtic

High peak, heavy tails

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24

Mesokurtic

Normal peak (K = 3)

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25

Platykurtic

Flat peal, light tails

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