there are different types of Graphs which is used in the biostatistical study, they are useful methods in presenting simple statistical data. Diagrams are better retained in the memory than statistical tables.
2. FREQUENCY DISTRIBUTION AND DATA: TYPES,
TABLES, AND GRAPHS
• Frequency distribution in statistics provides the information of
the number of occurrences (frequency) of distinct values distributed
within a given period of time or interval, in a list, table, or graphical
representation. Grouped and ungrouped are two types of frequency
distribution.
• Data is a collection of numbers or values and it must be organized for it
to be useful.
3. PRESENTATION METHODS OF STATISTICAL DATA
• 1. TABULATION:
• Tables are devices for presenting data simply
from masses of statistical data. Tabulation is
the first step before data is used for analysis.
Tabulation can be in form of simple tables
or frequency distribution table (i.e., Data is
split into convenient groups).
• 2. CHARTS AND DIAGRAMS:
• They are useful methods in presenting
simple statistical data. Diagrams are better
retained in the memory than statistical
tables.
4. THE METHODS
USED ARE:
(A) BAR CHARTS:
They are merely a way of
presenting a set of numbers
by the length of a bar. The bar
chart can be simple, multiple
or component type.
5. (B) HISTOGRAM:
It is a pictorial diagram of
frequency distribution. It
consists of a series of
blocks. The class intervals
are given along the
horizontal axis and the
frequencies along the
vertical axis.
7. (D) PIE CHARTS:
Instead of comparing the
length of a bar, the areas of
segments of a circle are
compared. The area of each
segment depends upon the
angle.
8. (E) FREQUENCY
POLYGON:
A frequency distribution
may be represented
diagrammatically by the
frequency polygon. It is
obtained by joining the
mid-points of the histogram
blocks.
