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Correlation and Best Fit Line

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Occasional Contributor
Posts: 6

Correlation and Best Fit Line

I am trying to create a scatter plot showing correlation stats that includes a best fit line. I am confused as to if I need to do a regression instead?

 

Also, my data is widely distributed, is there a way to add a log scale (Y axis) to the scatter plot so it is more spread out and can be seen clearer?

Trusted Advisor
Posts: 1,630

Re: Correlation and Best Fit Line

[ Edited ]

PROC REG and PROC CORR and PROC SGPLOT (and probably others) will create this plot for you. No, you don't need to do a regression, but you can if you want to. The correlation best fit line actually corresponds to the first axis in principal components analysis, you could figure out what that is and then plot that line.

 

Regarding the log scale, you could easily convert the y-variables to log scale in a data step before doing the plotting.

 

 

Super User
Posts: 17,912

Re: Correlation and Best Fit Line

PROC CORR

http://support.sas.com/documentation/cdl/en/procstat/66703/HTML/default/viewer.htm#procstat_corr_exa...

 

PROC SGSCATTER - SAS Note + sample code for scatter plot + regression line. 

http://support.sas.com/kb/48/465.html

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