Algebras of quotients of graded Lie algebras

In this paper we explore graded algebras of quotients of Lie algebras with special emphasis on the 3-graded case and answer some natural questions concerning its relation to maximal Jordan systems of quotients.Comment: 15 pages. To appear in the Journal of Algebr

Introductory Time Series with R

Abstracts not available for BookReview

Women mathematicians in data-centric occupations (with a context)

Texas State University, Women Doing Math and Talk Math 2 Me Joint Statistics Semina

VERTICAL INTEGRATION IN THE CHICKEN BROILER INDUSTRY

This paper analyzes three hypotheses concerning supply in the U.S. chicken broiler industry: (a) there has been a cycle in the industry of approximately 27-36 months length; (b) the seasonal and other periodic components, as well as relations between variables, have changed as a result of vertical integration in the industry; (c) the effects of vertical integration in the industry were counteracted in the early seventies by such forces external to the industry as domestic and international economic conditions . The hypotheses are analyzed using new monthly, non-seasonally adjusted time series data for chick placement, wholesale broiler prices, chicks hatched and net returns. Exploratory analysis using three different spectrum analysis methods, shows that there is evidence to confirm those hypotheses. Using that information, forecasting models are constructed, and their performance is compared to the performance of the standard distributed-lag models used by analysts of the industry . The paper then offers robusts results concerning hypotheses that have occupied the interest of analysts of the industry for a very long time. These results indicate that as vertical integration reached maturity, broiler suppliers tended to become sales maximizers

Hidden Markov Models for Time Series – An Introduction Using R

Abstracts not available for BookReview