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Is it possible to illustrate partial correlation scatter plots for 2 subgroups on the same graph?

e.g. I want to make scatter plots of data controlled for age, differentiated by males or females.

I've tried doing partial regression plots generated by linear regression analysis, but I can't split it by groups.

Options to do it in excel or R would be fine too. Thanks!

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  • $\begingroup$ I am not sure what exact plot you want (from reading your question I believe you are looking for a scatterplot of the data colored by groups) but hopefully my answer below gets at the heart of your question about plotting in R $\endgroup$ – user25658 Sep 18 '13 at 1:57
  • $\begingroup$ It is unclear in the end is your question related to SPSS. In SPSS Linear Regression procedure you can request partial correlation scatterplots. But they won't be group-coloured. Anyway, since you know what such a plot is, you can easily plot it yourself in any colouration you fancy - after you saved the appropriate two variables of residuals from the regression analysis procedure. $\endgroup$ – ttnphns Sep 18 '13 at 8:07
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    $\begingroup$ @BabakP, I understood it such that DPY wants a scatterplot between the residuals left by regressing $Y$ by all the variables except $X$ and the residuals left by regressing $X$ by all those variables except $Y$. This what is known as partial correlation scatterplot between $X$ and $Y$. $\endgroup$ – ttnphns Sep 18 '13 at 8:23
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Here is some code for how you could do it in R:

#Psuedo Data
group1 = rnorm(100)
group2 = rnorm(100)
response = rnorm(100)

#Plotting
plot(group1,response,xlim=c(min(group1,group2),max(group1,group2)),pch=21,bg="deepskyblue",
     ylab="Response Variable",xlab="Independent Variable")
points(group2,response,pch=21,bg="red")

#Adding a legend if desired
legend("topright",c("Group 1","Group 2"),pch=19,col=c("deepskyblue","red"),bg="white")

Which then generates the following plot: enter image description here

You could obviously add your own aesthetic touched but this should give you the general idea.

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  • $\begingroup$ thanks for that. I meant making a scatter plot for data which has been corrected by a covariate, and also splitting it into groups as you've suggested. $\endgroup$ – DPY Sep 18 '13 at 2:01
  • $\begingroup$ I am not sure what you mean corrected for a covariate but you are welcome. $\endgroup$ – user25658 Sep 18 '13 at 2:11
  • $\begingroup$ @DPY would you like me to edit my answer to reflect what ttnphns's comment suggested? $\endgroup$ – user25658 Sep 18 '13 at 17:57

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