A note on formatting
I apologise for the erratic and inconsistent formatting in these blogposts. Google's Blogger has many fine features, but control of formatting is not one of them. It has a mind of its own and will decide which font and spacing to use, despite instructions to the contrary. I don't want to spend hours delving in the html version to sort this out, so decided we'd have to live with it.
You may find it easier to copy the scripts from a Word document, rather than from this blog, in which case you can download the original document on which this blog is based from this site.
Comments are enabled on this blog, and I'd welcome feedback and suggestions for improvement. I will try to incorporate any good ideas, but I can't provide technical support, as (a) I am not very expert myself, and (b) have a busy job that is only occasionally concerned with twin analysis.
I hope somebody out there finds this useful!