Graphic methods - correlation regression analysis, Operation Research

Graphic Methods

a.Scatter Diagram: Scatter  diagram  is a special  type of dot chart.  Under  this methods  the given data are  plotted in  a graph  paper  in the form of  dot. For each  pair of  or x and y values  we plot a dot( or  point) and thus  we obtain  many  dots equal in number of observation. If now these  plotted dotes  or points  show some  trends  either  upwards or downwards then the two variables  ( x and y) are said to  be correlated or otherwise not correlated. If  again  the trend of points  is upwards  moving  from  lower left hand corner to upper right hand corner then correlation is positive  ( r=+1) r is  coefficient  or correlation. On the  other hand if movement is reverse i, e,  dots  move  from  upper  left hand  corner  to lower right  hand corner then correlation  is negative (r= -1). The  idea  will be  clear from  diagram given  below:

1802_Graphic Methods.png

 

                    Positive Correlation                    Negative  Correlation

 

In fig (a) the values  of the two  variable  move in the same  direction the correlation is  positive and r= 1.

 In figure (b) we  find  negative  correlation and r= 1 as the values  move in  reverse direction.

 In figures (c) we dont  get any  trend  lying  and heance it shows  the  absence  of correlation  and r= 0.

 

 

Posted Date: 3/4/2013 11:30:23 PM | Location : United States







Related Discussions:- Graphic methods - correlation regression analysis, Assignment Help, Ask Question on Graphic methods - correlation regression analysis, Get Answer, Expert's Help, Graphic methods - correlation regression analysis Discussions

Write discussion on Graphic methods - correlation regression analysis
Your posts are moderated
Related Questions
Problem 1 (Problem 23, page 507) At a machine tool plant, five jobs must be completed each day. The time it takes to do each job depends on the machine used to do the job. If a mac

Simple Graph The values of the two variables are plotted on a graph paper. We get two curves one for x variables and another for y  variables. These  two curves reveal the dir

C++ code for assignment problem

how to solve simplex method in LPP?

Research Paper Overview Research Topic: •    Research the effects of federal mandates in your state.  Examples include the Americans with Disabilities Act, the No Child Left B

a pipe lis dur for rpair,the repair would cost 10000 and it would last for 3 years.alternatively a new pipe line can be purchase at 30000 for 10 years.assuming 10% depriciation rat

write the scope of operation research

In a business, statistics is used to study the demand and market characteristics of the product or service being sold. In fact, market research

After having studied as to what is operations research we shall now try to answers why its need has been felt by the industry. As already tainted out science of OR came

1. A local university purchases exercise books to give to their students. Instead of a fixed unit cost, their supplier quotes the following discount pricing: Order quantity Unit P