The necessary switch has been made for this data file and this file of start values. With the corrected data file and starting values, to estimate the 1-dimensional ideal points for the 1st House, one needs the free WinBugs program, which is available for download here . After installation, this code contains the model specification. Here are the above files in a single zipped file. Includes data from 85th Senate.
Original source is here .
Excel worksheet of Poole and Rosenthal's dimension 1 and 2 Common Space scores for members who served in the 75th to 105th Congress. Data is from Spaeth's study, which is found here and is study number 9422.