DEVELOPMENTAL TRAJECTORY GROUPS: FACT OR A USEFUL STATISTICAL FICTION?*

A rapidly growing literature in criminology and psychology uses a group‐based methodology to identify and analyze developmental trajectories. Some confusion has arisen about the interpretation of this novel statistical model and with it some degree of cautionary commentary. We begin with a discussion of the role of trajectory groups as a statistical device for approximating population differences in developmental trajectories. We then discuss three misconceptions about group‐based trajectory modeling that stem from misunderstandings about the approximating role of trajectory groups: (1) individuals actually belong to a trajectory group, (2) the number of trajectory groups is immutable, and (3) the trajectories of group members follow the group‐level trajectory in lock step. We also point out that groupbased statistical modeling is not bound at the hip to the testing of taxonomic theories, and can just as well be used to test nontaxonomic theories.     

What Happens When House Members “Run with Congress”? The Electoral Consequences of Institutional Loyalty

This article characterizes the electoral consequences of messages of institutional loyalty and disloyalty sent by incumbent House members to their constituents. We show that, for the contemporary House, there is variation in these messages—not all incumbents in the contemporary House “run for Congress by running against Congress.” Moreover, we show that these messages can, under the right conditions, have significant electoral consequences, even after controlling for party affiliation and district political factors. In addition to demonstrating the electoral relevance of legislators' presentations, our results show an incumbent‐level link between constituents' trust in government and their voting behavior—a link created by interaction between constituents' perceptions, legislators' party affiliations, and the messages that legislators send to their constituents.     

Why China Won't Follow Arab Revolt

Do China's mandarins have anything to fear from the winds of freedom that have blown away Arab autocrats? The short answer is no—for now. The Chinese government has performed for its people, lifting hundreds of millions out of poverty during the same length of time Hosni Mubarak reigned in Egypt. Though many in the West would like to think so, it is not likely that the rising middle class in China will one day also fill Tiananmen Square in protest. In the immediate future, the chaos and economic drift that will now engulf the liberated Middle East will remind them again that China was right not to go down the path of Gorbachev's glasnost and perestroika in Russia. And it is not as if they will have a chance. The authorities are determined never to allow any two people who vent virtually on the Net to meet in the street. In this section, we discuss the impact of the Arab revolt—and lack of it—on China's system of governance.