The topic of this paper is access to and documentation of survey data financed through public funds. We distinguish between four types of publicly financed survey data: (1) Academic survey data from the national or international research infrastructures; (2) data from DFG projects or similarly...

In this article we attempt to replicate the hypothesis tested by Rummel and others that external and internal conflict are unrelated. We do this using data for 125 nations for the years 1966-1967. As did Rummel, we use exploratory factor analysis and regression analysis; in addition, we also...

Linear-additive age-period cohort models that permit the maximum number of aging effects, period effects, and cohort effects (full cohort models) are underidentified. In this article, some general rules will be given for detecting identified and underidentified parameters in any full cohort...