Method data presentation, Exercises of Biostatistics

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BiostatisticsBiostatistics

Lecture 4

Methods of Data Presentation

1- Numerical presentation

2- Graphical presentation

3- Mathematical presentation

2

1- Numerical Presentation PH311/ Fall 2010 4

1- Numerical Presentation

Name of variable (Units of variable) Frequency (number)

Categories Total

Tabular presentation (simple – complex)

Simple frequency distribution Table

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Table (II): Distribution of patients by age groups Age Group (years) Frequency % 20- 30- 40- 50+

Total 50 100 7

Complex frequency distribution Table

Table (III): Distribution of lung cancer patients by

smoking status

Smokin g Lung cancer Total Yes No No. % No. % No. % Smoker 15 75% 8 20% 23

Non smoker

Total 20 100 40 100 60 100 8

Frequency Tables

• (^) Table Frequency distribution of 30 adult male patients by Hb

Hb (g/dl) No. of

patients

Total 30

Tabulate the hemoglobin values of 30 adult male patients listed below

Hb (g/dl) Tall marks^ No. patients 9.0 – 9. 10.0 – 10. 11.0 – 11. 12.0 – 12. 13.0 – 13. 14.0 – 14.

l lll lll llll llll llll lll ll

Total 30

Final table

Hb (g/dl) No. of patients

Total 30

Frequency Table

A research study has been conducted examining

the number of children in the families living in a

community. The following data has been

collected based on a random sample of n = 30

families from the community.

Organize this data in a Frequency Table!

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X=No. of Children Count (Frequency) Relative Freq. 0 2 2/30=0. 1 3 3/30=0. 2 5 5/30=0. 3 5 5/30=0. 4 6 6/30=0. 5 4 4/30=0. 6 2 2/30=0. 7 2 2/30=0. 8 1 1/30=0. 17

Age Groups Frequency Relative Frequency 32 -36 yr 2 2/30=0. 37- 41 yr 3 3/30=0. 42-46 yr 4 4/30=0. 47-51 yr 3 3/30=0. 52-56 yr 8 8/30=0. 57-61 yr 3 3/30=0. 62-66 yr 4 4/30=0. 67-72 yr 3 3/30=0. Total n= 19

2-Graphical presentation