Interactively, use Graph Builder. I will demonstrate with Big Class.
Drag Height to the x-axis.
Change the graphing element to Histogram.
Drag Sex to the Overlay region.
Click Done.
Personally, I am not a fan of overlaid histograms. The overlapping bars hide too much. Fortunately, Graph Builder allows you to switch from bars to the kernel density:
This is clearer to me at least.
I figured out how to get them overlaid, but I am not very happy with the look.
I used the kernel density picture shown above. I then right-clicked the graph and chose Edit > Copy Frame Contents.
Now switch the picture back to the bars.
Right-click the graph and choose Edit > Paste Frame Contents.
< last picture doesn't seem to be displaying so I have attached it>
There are likely some ways to make this prettier, but I have not spent any time looking into that.
Finally, you could use Distribution and a similar trick (Copy Frame Contents and paste into the other graph) to overlay the histograms. You may want to play with the proper shading and such so that the graph is legible). The advantage with Distribution is that you could get a distribution fit (rather than a kernel fit). Plus, the distribution platform allows you to specify the bin width, which will not "mess up" the x-axis.
