Calling the lp_solve Linear Program Software from R, S-PLUS and Excel

We present a link that allows R, S-PLUS and Excel to call the functions in the lp_solve system. lp_solve is free software (licensed under the GNU Lesser GPL) that solves linear and mixed integer linear programs of moderate size (on the order of 10,000 variables and 50,000 constraints). R does not include this ability (though two add-on packages offer linear programs without integer variables), while S-PLUS users need to pay extra for the NuOPT library in order to solve these problems. Our link manages the interface between these statistical packages and lp_solve. Excel has a built-in add-in named Solver that is capable of solving mixed integer programs, but only with fewer than 200 variables. This link allows Excel users to handle substantially larger problems at no extra cost. While our primary concern has been the Windows operating system, the package has been tested on some Unix-type systems as well.

An Excel Add-In for Statistical Process Control Charts

Statistical process control (SPC) descibes a widely-used set of approaches used to detect shifts in processes in, for example, manufacturing. Among these are "control charts". Control charts and other SPC techniques have been in use since at least the'50s, and, because they are comparatively unsophisticated, are often used by management or operations personnel without formal statistical training. These personnel will often have experience with the popular spreadsheet program Excel, but may have less training on a mainstream statistical package. Base Excel does not provide the ability to draw control charts directly, although add-ins for that purpose are available for purchase. We present a free add-in for Excel that draws the most common sorts of control charts. It follows the development of the textbook of Montgomery (2005), so it may be well-suited for instructional purposes.

A History of the Hunter Hills Theatre, 1956-1977

The purpose of this study was to investigate the history of the Hunter Hills Theatre in Gatlinburg, Tennessee, and to provide an accurate account of the theatre operation from 1956 to 1977. Hunter Hills Theatre is an outdoor theatre located in an increasingly popular resort area. It is one of the most beautiful amphitheatres in the Southeastern United States. The study is divided into five chapters. Chapter I includes an introduction with pertinent information about the site selection and the construction of the amphitheatre. Chapter II deals chronologically with the first years the theatre operated, 1956-1959. Historical facts concerning the production of the outdoor drama Chucky Jack are detailed in Chapter II. In the third chapter, the intermediate years, 1960-1965, are presented. The third chapter offers historical fact about the productions at Hunter Hills sponsored by the Washington Ballet, the Music Under the Stars concert series, and the Union college Summer Music Festival. Chapter IV offers a chronological look at the operation of Hunter Hills from 1966 to 1977. The first twelve years of summer repertory productions by the University of Tennessee are detailed in Chapter IV. The final chapter, Chapter V, offers conclusions about the study. The primary means and procedures used in data assembly for this study have been newspaper accounts, magazine articles, special theatre collections, producing organization\u27s records files, programs, and personal interviews with individuals associated with the theatre over the years. During the course of the study, materials were collected relative to the twelve years that the University of Tennessee has operated the theatre. These items of theatre memorabilia include pictures, letters, programs, and so on. The material was placed in chronologically dated file folders, with indexing and labeling of information--including pictures-- properly affixed. The collection was then presented to the University of Tennessee Special Collections Library to be contained as a permanent record in the Hunter Hills Theatre Special Collection. A listing of the items in the collection appears in Appendix I. This study should help further the resolve that Hunter Hills Theatre has given a great deal to those who have been associated with it over the years; to the community, to the development of Gatlinburg, to the student of the drama, to the University of Tennessee, to many individuals who have worked in the operation of the theatre in various capacities. It is hoped that this chronological history of the theatre will help illustrate the artistic achievements which have been so enriching and which are sometimes overlooked when concern for the theatre\u27s financial stability are considered

The Smarter Regression add-in for linear and logistic regression in excel

The widely-used Excel spreadsheet program has a linear regression routine, but it has a number of drawbacks: it does not handle categorical predictors; it requires to the user to generate columns for interactions; it cannot compute logistic regressions; and it is limited to 16 predictor columns. We have developed an Excel add-in that does both logistic and linear regression, handles categorical and interaction variables in an obvious way, and removes the 16-column limit. We also support nested model tests and, for linear regression, transformations of the response variable. Although we do not claim that Excel is the proper tool for data analysis, our tool can make both small, quick analyses and introductory statistics courses simpler and more complete.Approved for public release; distribution is unlimited

Inclusion, Engagement, and Nearpod: Providing a Digital Alternative to Traditional Instruction

Unfortunately, the onset of Covid-19 and the ensuing pandemic led to a shift in the structure of classrooms across all levels of the educational spectrum. The resulting move to more social distancing methods, including a combination of face-to-face and online formats, led to a need for innovative uses of technology. In this article, Nearpod is explored as an alternative way to present information while increasing engagement and inclusivity in the classroom. Research studies and reviews are scrutinized on the use of Nearpod as tool for teachers and pre-service teachers in K-12

Calling the lp_solve Linear Program Software from R, S-PLUS and Excel

We present a link that allows R, S-PLUS and Excel to call the functions in the lp_solve system. lp_solve is free software (licensed under the GNU Lesser GPL) that solves linear and mixed integer linear programs of moderate size (on the order of 10,000 variables and 50,000 constraints). R does not include this ability (though two add-on packages offer linear programs without integer variables), while S-PLUS users need to pay extra for the NuOPT library in order to solve these problems. Our link manages the interface between these statistical packages and lp_solve. Excel has a built-in add-in named Solver that is capable of solving mixed integer programs, but only with fewer than 200 variables. This link allows Excel users to handle substantially larger problems at no extra cost. While our primary concern has been the Windows operating system, the package has been tested on some Unix-type systems as well

An Excel Add-In for Statistical Process Control Charts

t shifts in processes in, for example, manufacturing. Among these are control charts".Control charts and other SPC techniques have been in use since at least the 1950s, and,because they are comparatively unsophisticated, are often used by management or op-erations personnel without formal statistical training. These personnel will often haveexperience with the popular spreadsheet program Excel, but may have less training on amainstream statistical package. Base Excel does not provide the ability to draw controlcharts directly, although add-ins for that purpose are available for purchase.We present a free add-in for Excel that draws the most common sorts of control charts.It follows the development of the textbook of Montgomery (2005), so it may be well-suited for instructional purposes

Field-Induced Staggered Magnetic Order in La(2)NiO(4.133)

At low temperature the holes doped into the NiO(2) planes of La(2)NiO(4.133) by the excess oxygen collect in diagonal stripes that separate narrow antiferromagnetic domains. The magnetic order drops abruptly to zero at T_m = 110.5 K, but charge order remains with a period of 3a/2. We show that application of a magnetic field in the regime T > T_m induces staggered magnetic order of period 3a due to the net magnetic moment of the high-temperature bond-centered stripes, together with the odd number of Ni spins across an antiferromagnetic domain.Comment: 4 pages, Revtex, 4 epsf figs included with psfig

Studies on Growth and Morphology of a Trichomonad from the Caecum of the Pig

The growth and morphology of a caecal porcine trichomonad (probably Tritrichomonas rotunda) were studied from both the trichomonad\u27s natural environment, the pig\u27s caecum, and in culture. Growth of the organism was studied in C.P.L.M. medium at 37° C. After an initial inoculum of 100 organisms per ml. the population rose to 2,900,000 per ml. on day 4 and then decreased to near extinction on day 7. In comparison to the organisms on stained smears made directly from the pig\u27s caecum, the organisms after extensive subculturing (100 subcultures over a period of 20 months) were more elongate and often almost tubular; possessed longer undulating membranes and costas approaching full body length instead of only ½ -1/3 body length; had axostyles with a more bulbous capitulum; and had club-shaped parabasal bodies instead of V-shaped structures. No significant variations were found in the morphology of the trichomonads during the various days of the culture cycle. Because of these morphological changes during extended subculturing, the interpretation of the morphological structures based upon trichomonads after extended periods of subculturing must be viewed with caution