Assessment of bias due to random measurement errors in stem volume growth estimation by the Swedish National Forest Inventory

We evaluated the performance of two methods for estimating stem volume increment at individual tree level with respect to bias due to random measurement errors. Here, growth is either predicted as the difference between two consecutive volume estimates where single-tree volume functions are applied to data from repeated measurements or by a regression model that is applied to data from a single survey and includes radial increment. In national forest inventories (NFIs), the first method is typically used for permanent plots, the second for temporary plots. The Swedish NFI combines estimates from both plot types to assess growth at national and regional scales and it is, therefore, important that the two methods provide similar results. The accuracy of these estimates is affected by random measurement errors in the independent variables, which may lead to systematic errors in predicted variables due to model non-linearity. Using Taylor series expansion and empirical data from the Swedish NFI we compared the expected bias in stem volume growth estimates for different diameter classes of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.). Our results indicate that both methods are fairly insensitive to random measurement errors of the size that occur in the Swedish NFI. The empirical comparison between the two methods showed greater differences for large diameter trees of both pine and spruce. A likely explanation is that the regressions are uncertain because few large trees were available for developing the models

Using the Brain-Rate as a Preliminary Indicator of General Mental Activation in Cognitive Neurorehabilitation of TBI Patients

The aim of this paper is to propose a brain rate as a preliminary indicator of a general mental arousal level and as a general multiband neurofeedback parameter, considering the neuro-physical mechanisms in a cognitive neurorehabilitation of TBI patients

Significant Moments in a Couple Therapy Session : Towards the Integration of Different Modalities of Analysis

This chapter presents a couple therapy session from four different research perspectives: The verbal dialogue was analysed with the Dialogical Investigations of Happenings of Change method, the embodied reactions of each participant were analysed by examining the electrodermal activity of each participant, and nonverbal synchrony was observed between the participants. Stimulated Recall Interviews, conducted individually after the session, were used to gain insights on the participants’ thoughts and feelings concerning particular moments in the session. We wished to determine what could be learned from the embodied reactions of the participants in couple therapy, including whether the data obtained via the different research methods were telling the same or different story about the same moment within the couple therapy session.peerReviewe