Hospital information systems : a nursing viewpoint : a thesis presented in partial fulfilment of the requirements for the degree of Master of Arts in Nursing Studies at Massey University

This thesis is concerned with hospital information systems. The literature relating to management information systems is examined in conjunction with the literature which specifically focuses upon hospital and nursing information systems. A field study, using a case study approach, is designed and implemented, its purpose being to analyse five sub-systems of a current hospital information system in use in one Hospital Board. This field study utilises a basic systems analysis methodology focusing upon the problem identification and performance identifications of the analysis cycle. In the problem identification phase forty-two subjects are interviewed, (83.3% of the sample being nurses in management positions). Check lists designed to test the sub-systems abilities to generate, store, retrieve and utilise data, and test the subjects knowledge of the sub-systems are devised and applied. The data obtained from the application of check lists is analysed and data flow charts and in-depth interview schedules developed for use in phase two or the performance identification phase of the field study. In phase two (performance identification) eleven subjects in administrative positions within the Hospital Board are interviewed using the data flow charts and the in-depth interview schedules as tools for eliciting data. Contrary to the author's expectations the field study results reveal a considerable diversity. In phase one the respondents possessed a sound knowledge of the admission/discharge, patient care and nursing management sub-systems. 85,7% of the nurse respondents have knowledge of the patient care sub-system and a further 79.2% have some knowledge of its ability to generate, store, retrieve and utilise information. In common with the administrators the high level of knowledge of retrieval and utlisation (89.2%) would indicate frequent use of the system. By contrast only 5.4% of the respondents in phase one had knowledge of retrieval and utilisation of the staffing information sub-system as compared with 100% in the administrators group. This same pattern emerges for the financial sub-system with 13.5% of the respondents having knowledge of retrieval and 18.9% of utilisation of the sub-system compared with 81.8% of administrators. These results indicate to the author that information systems development tends to be associated with each health discipline rather than with the macro development of a relevant, comprehensive hospital information system. To this end a series of questions are raised and possible answers provided. Finally a model which could become a prescription for future development is presented

Do consumers really know if the price is right ? Direct measures of references price are their implications for retailing

Reference price research suggest that consumers memorize and recall price information when selecting brands for frequently purchased products. In this study, we show that previous price-knowledge surveys provided imperfect estimates of reference price. Further, we propose to use a combination of price recall, price recognition, and deal recognition to measure representations to memorize prices. In addition we identify consumer and product characteristics that explain the variations in price knowledge.price knowledge; reference price; retailing

The Database Query Support Processor (QSP)

The number and diversity of databases available to users continues to increase dramatically. Currently, the trend is towards decentralized, client server architectures that (on the surface) are less expensive to acquire, operate, and maintain than information architectures based on centralized, monolithic mainframes. The database query support processor (QSP) effort evaluates the performance of a network level, heterogeneous database access capability. Air Force Material Command's Rome Laboratory has developed an approach, based on ANSI standard X3.138 - 1988, 'The Information Resource Dictionary System (IRDS)' to seamless access to heterogeneous databases based on extensions to data dictionary technology. To successfully query a decentralized information system, users must know what data are available from which source, or have the knowledge and system privileges necessary to find out this information. Privacy and security considerations prohibit free and open access to every information system in every network. Even in completely open systems, time required to locate relevant data (in systems of any appreciable size) would be better spent analyzing the data, assuming the original question was not forgotten. Extensions to data dictionary technology have the potential to more fully automate the search and retrieval for relevant data in a decentralized environment. Substantial amounts of time and money could be saved by not having to teach users what data resides in which systems and how to access each of those systems. Information describing data and how to get it could be removed from the application and placed in a dedicated repository where it belongs. The result simplified applications that are less brittle and less expensive to build and maintain. Software technology providing the required functionality is off the shelf. The key difficulty is in defining the metadata required to support the process. The database query support processor effort will provide quantitative data on the amount of effort required to implement an extended data dictionary at the network level, add new systems, adapt to changing user needs, and provide sound estimates on operations and maintenance costs and savings

An empirical model of volatility of returns and option pricing

This paper reports several entirely new results on financial market dynamics and option pricing We observe that empirical distributions of returns are much better approximated by an exponential distribution than by a Gaussian. This exponential distribution of asset prices can be used to develop a new pricing model for options (in closed algebraic form) that is shown to provide valuations that agree very well with those used by traders. We show how the Fokker-Planck formulation of fluctuations can be used with a local volatility (diffusion coeffficient) to generate an exponential distribution for asset returns, and also how fat tails for extreme returns are generated dynamically by a simple generalization of our new volatility model. Nonuniqueness in deducing dynamics from empirical data is discussed and is shown to have no practical effect over time scales much less than one hundred years. We derive an option pricing pde and explain why it‘s superfluous, because all information required to price options in agreement with the delta-hedge is already included in the Green function of the Fokker-Planck equation for a special choice of parameters. Finally, we also show how to calculate put and call prices for a stretched exponential returns density.Market instability; market dynamics; finance; option pricing