Biostatistics : Types of Variable
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Transcript of Biostatistics : Types of Variable
Dr Tarekk
Types of
Variables
Duration: ≈ 60 Minutes
Dr Tarekk Alazabee2012
Libyan National Center for Diseases Control
Main objectives
After completing this presentation, the
participants will able to:
- Define Statistics and Biostatistics.
- Define and identify the different types of data
and understand why we need to classifying
variables.
Agriculture
Economy
Industry
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In Public Health
- Some of the statistics most often
encountered are called means, standard deviation, percentages, and rates.
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◘ What is the data?
◘ What is statistics?
◘ What is biostatistics?
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What is the data?
The data is the raw material of
statistics.
The data could be numbers or
categories or both.
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What is statistics?
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StatisticsLatin:
Status: “manner of standing” or “Position“.
هل نحن ضائعون؟
أين أقف اآلن؟
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Data InformationStatistics
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Part of Data
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The purpose: To determine the nature
of the information
The field of study concerned with:
o The collection, organization, summarization, and analysis of data. ( Descriptive Statistics).
o The Drawing of inferences about body of data when only a part of the data is observed.
( Inferential Statistics ).
Definition
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What is Biostatistics?
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Biostatistics
Is Statistics applied to
biological sciences and
medicine.
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Routinely Kept Records.
Surveys.
Experiments.
External Sources
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أنـــواع المتغيــرات
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Variable:
Characteristic that can take on different
values for different persons, places or
things.
Exp: Age, Gender, Blood pressure
Statistical analysis need variability;
otherwise there is nothing to study
Definition
Variables
Qualitative V Quantitative V
Continuous V Discrete V
Types of Variables
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I. Quantitative Variable ( Numerical V)
- Measurements made on quantitative
variables convey information
regarding amount.
Quantitative Variable
- Discrete V
- Continues V
a) Discrete V (Countable):
Is characterized by gaps or interruptions
in the values that it can assume.
Exp: No of admissions.
No of decayed teeth per child.
I. Quantitative Variable
1 2 3 4
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b) Continuous V (Measurable):
can assume any value within a specified relevant interval of values.
Exp: Age. Blood Sugar. Height. Weight
I. Quantitative Variable
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100 230
7 Years 25 Years
I. Quantitative VariableDr Tarekk
II. Qualitative (Nominal) Variable:
- Some characteristics are not
capable of being measured in
the sense, and can be categorized
only.
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O
AB
B
A
Blood
Group
Gender
Male
Female
Qualitative (Nominal) Variable:
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Justification
Statistical
Tests
Data
Presenting
Data
Summarizing
Types of
the Variables
Scales of
Measurement
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NEXT
Data Presentation
Thanks
Dr Tarekk
