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From Wikipedia

Scatter plot

A scatter plot or scattergraph is a type of mathematical diagram using Cartesian coordinates to display values for two variables for a set of data.

The data is displayed as a collection of points, each having the value of one variable determining the position on the horizontal axis and the value of the other variable determining the position on the vertical axis. This kind of plot is also called a scatter chart, scatter diagram and scatter graph.

Overview

A scatter plot is used when a variable exists that is under the control of the experimenter. If a parameter exists that is systematically incremented and/or decremented by the other, it is called the control parameter or independent variable and is customarily plotted along the horizontal axis. The measured or dependent variable is customarily plotted along the vertical axis. If no dependent variable exists, either type of variable can be plotted on either axis and a scatter plot will illustrate only the degree of correlation (not causation) between two variables.

A scatter plot can suggest various kinds of correlations between variables with a certain confidence interval. Correlations may be positive (rising), negative (falling), or null (uncorrelated). If the pattern of dots slopes from lower left to upper right, it suggests a positive correlation between the variables being studied. If the pattern of dots slopes from upper left to lower right, it suggests a negative correlation. A line of best fit (alternatively called 'trendline') can be drawn in order to study the correlation between the variables. An equation for the correlation between the variables can be determined by established best-fit procedures. For a linear correlation, the best-fit procedure is known as linear regression and is guaranteed to generate a correct solution in a finite time. Unfortunately, no universal best-fit procedure is guaranteed to generate a correct solution for arbitrary relationships.

A scatter plot is also very useful when we wish to see how two comparable data sets agree with each other. In this case, an identity line, i.e., a y=x line, or an 1:1 line, is often drawn as a reference. The more the two data sets agree, the more the scatters tend to concentrate in the vicinity of the identity line; if the two data sets are numerically identical, the scatters fall on the identity line exactly.

One of the most powerful aspects of a scatter plot, however, is its ability to show nonlinear relationships between variables. Furthermore, if the data is represented by a mixture model of simple relationships, these relationships will be visually evident as superimposed patterns.

The scatter diagram is one of the basic tools of quality control.

Example

For example, to display values for "lung capacity" (first variable) and how long that person could hold his breath, a researcher would choose a group of people to study, then measure each one's lung capacity (first variable) and how long that person could hold his breath (second variable). The researcher would then plot the data in a scatter plot, assigning "lung capacity" to the horizontal axis, and "time holding breath" to the vertical axis.

A person with a lung capacity of 400 ml who held his breath for 21.7 seconds would be represented by a single dot on the scatter plot at the point (400, 21.7) in the Cartesian coordinates. The scatter plot of all the people in the study would enable the researcher to obtain a visual comparison of the two variables in the data set, and will help to determine what kind of relationship there might be between the two variables.



From Yahoo Answers

Question:I have a small want to just create a book. Just for myself, not to get published. I would like some ideas for a story line and/or plot. Also main characters, and their descriptions (looks, actions, behavior)

Answers:Wait, you want to write a book, but you don't want to have to come up with the idea for it yourself? I'm sorry, but that's lame. Write your book about a girl who has to write a book to fulfill some inner longing, but she hates the process of being creative. The irony is that the writing is what sucks and the creativity is what makes the writing worthwhile. (Take it from me, I've written two books.) Your character's name is whatever pseudonym you come up with for your self (or Jane Doe if you hate creativity so much) and I would say she looks a lot like you. Good luck.

Question:How do I go about making a line plot on excel? I would need it to look like the following picture: http://www.europa.com/~paulg/mathmodels/VMII-17b.gif Is there any way to do this and if so, can someone explain?

Answers:Try this link. http://peltiertech.com/Excel/Charts/Histogram.html

Question:I am looking for a book I read a while ago but unfortunately can only remember the plot. Not the author or name or any other details. Are there any websites I can use to search for this book by it's plot line or contents only?

Answers:You can go to this site and enter what you remember. They're pretty good, usually. http://www.whatsthatbook.com/ Or this one. http://forums.abebooks.com/abesleuthcom Or you could ask here. Sometimes we fail but sometimes we're pretty good too. Good luck.

Question:I need to know the difference between a line graph and line plot! If they are the same then oops!! ha ha! but im pretty sure they're not! If you know the difference please let me know!! Thanks again! P.S. if you have pics of the two please include them!!

Answers:plot is the one with all the dots and individual readings where as a line takes the average of those individual readings and makes a line

From Youtube

The Line Plot :A short description about the interpretation of line plots

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