Bp801t correlation.
Hello friends, welcome to our blog in today blog we are going to discuss about correlation unit 1 bp801t biostatistics and research methodology.
Correlation is the most important topics from the unit 1 and it's ask many questions from this topic in semester exam.
So, let's start the topic A statistical technique that is used to analyze the
strength and the direction of the relationship between
two quantitative variables is called Correlation
analysis It is the inter relationship of the association of two
or more variables.
Significance of correlation
Correlation analysis contributes to the understanding of
economic behaviour.
1.The prediction based on correlation analysis will be more,
reliable and near to reality.
2.In economic theory, an association between two or more,
variables such as price, supply & quantity demanded, type of soil,
quality of seeds, rainfall and so on is established.
3.In healthcare, an association between two or more variables,
such as reliability & validity of clinical measures is established.
Types of correlation
1.Positive & Negative correlation
If one variable increases, other variables also
increases or vice versa.
2.Linear & Non linear Correlation
If the ratio between two variable is constant is
called Linear Correlation otherwise Non Linear.
Coefficient of correlation
1.It is represented by ‘r’
2.The range of r always lies between -1 to +1.
3.If r = -1, correlation is perfect & negative.
4.If r = +1, correlation is perfect & positive.
5.If r = 0, no correlation between variables.
Let's understand with a numerical. It's is a very important topics so learn Pearson formula and solve as many problems.
Let's put the value on Pearson formula
r =. (5 x 550 – 15x150)
√5x55 – (15)2 √5x5500 – (150)2
Further solve..Next topic will be most important regression.