I promised some comparison plots from the code reported in the last post, but Zeke has made the task much easier. He posted a spreadsheet with all the data nicely arranged, and I added my own data - you can find the spreadsheet "Temp Comps_NS.xls" in the drop.io repository.
Below are some of the plots and discussion.
A summary of this series of posts is here.
Here is the global data from 1880 ( or 1881 in my case). Details of the sources are on Zeke's post. All data is set to zero average in 1961-90.
And here is a close-up of the period 1960-2009.
The agreement is good. This is encouraging, because the principle of the least squares method is very different, and bypasses all the merging of stations issues. Of course, the agreement of all the other reconstructions is also impressive.
Here is a plot with just the main indices GISS and Hadcrut: