The apc package includes functions for age-period-cohort analysis based on the canonical parametrisation of Kuang et al. (2008). The package includes functions for organizing the data, descriptive plots, a deviance table, estimation of (sub-models of) the age-period-cohort model, a plot for specification testing, plots of estimated parameters, and sub-sample analysis.

BACKGROUND No self-report method to measure different types and intensities of physical activity (PA) in adults has been tested in the Portuguese population. We assessed the validity, reproducibility and seasonal bias on past-year PA reporting. SUBJECTS AND METHODS A sample of 953 Portuguese adults was evaluated between 2001 and 2003. A 4 x 7-day PA diary was used as a reference method to eva...

The controllability of the linearized KdV equation with right Neumann control is studied in pioneering work Rosier [L. Rosier, ESAIM: COCV 2 (1997) 33-55.]. However, proof by contradiction arguments and value observability constant remains unknown, though rich mathematical theories are built on this totally unknown constant. We introduce a constructive method that gives quantitative

Telemanipulators have been introduced into cardiac surgery recently expanding the scope of minimally invasive techniques and enabling endoscopic cardiac surgery. Our aim was to evaluate clinical results of totally endoscopic single vessel bypass grafting on the arrested as well as on the beating heart. Since 1999, 44 totally endoscopic single vessel arterial bypass grafting procedures were perf...

silvicultural operation need to notice the species diversity. to this study gomarlang district in marivan region, northern zagros forest was selected. in this study 30 circle sample plots (500 m2) were collected by random method. in every sample plot the kind of species and number of trees and shrub were recorded. in the sample plots the micro plots of 5 m by 5 m (i.e. area of 25 m2) were desig...

fire, as a natural ecological disturbance factor in forest, this study located in the marivan region, northern zagros forest, and western iranian state of kurdistan. in each burned and unburned area 30 circle sample plot (1000 m2) were collected by randomized–systematic method in the 100×200 m net (in total 60 plots). in every sample plot the kind of species, number of tree, the height of coppi...

Field and ground layer vegetation in a mature Norway spruce (Picea abies L.) forest of Myrtillus-type in Kuorevesi, southern Finland, was sampled on 31 plots of sizes 0.5, 1 and 2 m to find optimal balance among sampling effort, number of observed species, and accuracy of mean species-cover estimates. Rarefaction and bootstrapping were used in the data analysis. According to the results, the ad...