Download - Qualitative Data summerization
DESCRIBTIVE BIOSTATISTIC WORKSHOP
غير / األمراض مكافحة إدارة الدراسات و االحصاء قسمالسارية
Dr Tarekk Alazabee
PercentageQualitative Data Summarization
Rate Ratio
2015
Learning Objective
Identify and combute the different measures of qualitative data summarization
At the end of this presentation, the participant will be able to:
I. Proportion Definition: Is the number (a) of
observations with a given characteristics (such having MI) divided by the total number of observation.
Proportion =
EXAMPLE
Male FemaleNo of CVD Patients
60 60
Myocardial. I 5 3
Question: What is the proportion of an MI among Male Patients ?
النسبة
The Proportion of an MI among Male Patients:
5 / 60 = 0.083
aa + b
A proportion: Is always defined as apart divided
by the whole.
Is useful for ordinal and numerical data as well as nominal data, especially when the observations have been placed in a frequency table.
5 33.36 40.04 26.715 100.0
Age Group1 - 56 - 1011 - 15Total
Frequency Percent
Q: What is the proportion of Patients Aged between 6 and 10 years?
. Percentage Is the proportion multiplies by
100.
Q: What is the Percentage of an MI among Male Patients ?
Male FemaleNo of CVD Patients
60 60
MI 5 3
(5 / 60) * 100 = 8.3 %
The Percentage of an MI among Male Patients:
MI
II. Ratio Is the number (a) of observations in
a given group with a given characteristic ( such as having an MI) divided by the number (b) of observations without the given characteristic (such as not having MI) RATIO = A / B
التناسب
Q: Among Male patients: What is the ratio of those who had an MI to those who did not?
Male FemaleNo of CVD Patients
60 60
MI 5 3
EXAMPLE
التناسب
Male FemaleNo of CVD Patients
60 60
MI 5 3Without MI 55 57The ratio of those who had an MI to those who did not for male patients:
ab
Ratio= 5 /55 = 0.09
5 : 55 + 50
1 : 11
MI PATIENTS Without MI PATIENTS
=
=
Remember
A ratio is always defined as a part divided
by an other part.
المقام من جزءا ليس البسط
III. Rate Are similar to proportion except
that a multiplier (eg,1000, 10.000 or 100.000) is used, and they are computed over specified period of time.
- The multiplier is called the base.Rate = X Base
المعدل
What is the Rate of MI per 1000 male patients in 2014 ?
Male FemaleNo of CVD Patients
60 60
MI 5 3
The admission number of CVD patients at Hospital A in 2014
0.083 X 1000 = 83 MI cases per 10.000 CVD admissionsIn 2014
Proportion Base Time Rate
Percentage
RatioRate
Studies
Reports