Stable traits but unstable measures? Identifying panel effects in self-reflective survey questions

vowel quality in persian: stable or unstable?

this paper addresses the validity of two hypotheses concerning changes of vowel quality in persian. the theory of centralization claims that there is a strong correlation between vowel duration and vowel quality. as vowel duration is shortened in unstressed contexts, the size of the vowel inventory reduces toward the center, leading to considerable overlap between different categories and a red...

Identifying Welfare Effects from Subjective Questions

We argue that the welfare inferences drawn from answers to subjective-qualitative survey questions are clouded by concerns over the structure of measurement errors and how latent psychological factors influence observed respondent characteristics. We propose a panel data model that allows more robust tests and we estimate the model on a high-quality survey for Russia. We find significant income...

Bracketing effects in categorized survey questions

In households surveys, quantities of interest are frequently elicited using categorized (range-card) formats rather than open-ended questions. One advantage of this format is that it typically reduces item non-response. Unfortunately, results from research in social psychology suggest that the choice of bracket values in range-card questions is likely to influence responses. Not much is known a...

Questions for Panel II

Ultrasonographic Comparison of Deep Lumbopelvic Muscles Activity in Plank Movements on Stable and Unstable Surface

Purpose: The body core facilitates the transition of forces and moments between the upper and lower extremities in every movement. The present study investigated the differences in the sonographic activity of the deep lumbopelvic muscles during the implementation of plank movements on stable and unstable surfaces. Methods: In total, 16 female athletes with the Mean±SD age of 23.69±3.57 years, ...