-. (2002). Maggioritario finalmente? La transizione elettorale 1994-2001.

Multidimensional scaling (or MDS) is a methodology for producing geometric models of proximities data. Multidimensional scaling has a long history in political science research. However, most applications of MDS are purely descriptive, with no attempt to assess stability or sampling variability in the scaling solution. In this article, we develop a bootstrap resampling strategy for constructing confidence regions in multidimensional scaling solutions. The methodology is illustrated by performing an inferential multidimensional scaling analysis on data from the 2004 American National Election Study (ANES). The bootstrap procedure is very simple, and it is adaptable to a wide variety of MDS models. Our approach enhances the utility of multidimensional scaling as a tool for testing substantive theories while still retaining the flexibility in assumptions, model details, and estimation procedures that make MDS so useful for exploring structure in data.

Maggini, N. (2010). Quali prospettive per il Pd e gli altri partiti di centrosinistra? Un’analisi dei dati e delle tendenze elettorali. Quaderni Del Circolo Rosselli, 108(3-4), 117–120.

Despite primary elections in Italy continue to be asymmetric – i.e. carried out only by the center-left coalition – their ability to involve the electorate and their growing media impact make it a powerful democratic tool. In this article we study the 2012 Italian primary elections, held by the center-left coalition in order to select the prime ministerial candidate for the 2013 general elections. In particular, we will shed light on three dimensions: turnout, electoral results and competitiveness. We will also take into account the role played by the new candidate selection rule – the two-round system – which will allow us to collect a lot of information about the voting behavior of the selectorate. What has been the turnout level in the 2012 Italian primary elections? Which similarities and differences can be found in the patterns of participation between the first and the second round? Which factors may explain the territorial differences in turnout levels? What have been the territorial patterns of voting behavior for the main candidates? The 2012 primary elections have been more or less competitive with respect to the previous Italian national primaries? We will try to address these questions through the use of a mainly quantitative methodology with aggregate data.