Page 246 - DSOC404_METHODOLOGY_OF_SOCIAL_RESEARCH_ENGLISH

Methodology of Social Research

notes technique. in this one side x category and the other side y category is taken. After this the price of x
category and the price of y category are shown in the form of dots. there is a distinct point for the
two values of a term. in this way the number of points is equal to the pairs of items.

29.6 Correlation Graph

to know about correlation we also use graph. in this techniques both the x and y categories are shown
on ordinate and the number, time are shown on vertical line and the place is shown on horizontal line.
if the graphs of both the categories move in the same direction than correlation is said to be positive.
But if reverse happens and the graphs of both categories moves in opposite direction than it is said
to be negative correlation. if there is not much difference between the two categories then the graphs
can be shown in the same scale and base line. if there is much difference between the two then it is
necessary to use two different scales.

29.7 Coefficient of Correlation

To find the extent and degree of correlation between two variables then we need to count their
coefficient of correlation. Many techniques can be used to find the coefficient of correlation but the
Carl Pierson formula is most famous and popular.

self assessment
fill in the blanks—
1. In this correlation is ___________ in the form of figures but the correlation is not in the form
of exact numbers rather it is in the form of estimate.
2. the technique to make this is similar to _______ point technique.
3. if the graphs of both the categories move in the same direction than it is said to be __________
correlation.

29.8 summary

y Conner has written, “When two or more results change in to a relationship such that any change
in the first results in a change in the second that they are said to be co-related.”
y When the two variables change in one direction then the correlation is said to be direct or
positive.
y if two variables change in opposite direction instead of same direction then their correlation
is said to be indirect or negative.”

29.9 Keywords

1. correlation—If price of other variable changes because of the change in first variable, then
the two variables can be said as correlated.
2. linear and non-linear correlation—Linear correlations are those in which there is a constant
ratio between the related variables and non-linear correlations are those where such ratios
increase and decrease.

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