“…This extensive literature has made great strides towards understanding the trends (e.g., Perelli-Harris and Lyons-Amos 2015; Hoem et al 2009;Heuveline and Timberlake 2004;Andersson and Philipov 2002;Kiernan 2004), correlates (e.g. Hiekel, Liefbroer, and Poortman 2014;Perelli-Harris et al 2010;Wiik, Keizer, and Lappegård 2012), and effects of partnership formation (e.g., Hiekel and Castro-Martin 2014;Lyngstad et al 2011;Soons, Liefbroer, Kalmijn 2009). However, most of these studies are primarily the outcome of a structured process of data collection in which respondents fit their answers to predefined alternatives.…”