12-20-2014 02:19 PM
I have to plot the line 0 = alpha +beta(x)
I've only used the proc gplot a few time and am not sure if I can set a plot an equation set to zero. How can I go about doing so? Thank you
12-20-2014 02:30 PM
Don't know if that helps...
You usually have y=beta(x) + e but if you want to force that to 0 you can subtract y:
0=beta(x) + e - y
And then e-y becomes your alpha.
0=alpha+beta(x) => -alpha=beta(x)
so that's another way, but it depends on what you want for a plot I suppose.
12-20-2014 09:42 PM
Here is a small sample. It's the HIV status (1=present) and the person's age in months. I have to see if month is a predictor for HIV status.
I'm asked to plot the line 0 = alpha + month(x) + month*month(w) and compare it to the scatterplot of month by month*month. I was able to do that scatterplot but I don't know what the code would be to plot the line.
12-22-2014 12:16 PM
Does this help?
input month hiv;
proc sgplot data = dataset;
scatter x = month y = hiv;
refline 0 / axis = y;