Two dimensional point data can be considered one of the most basic, yet one of the most ubiquitous data types arising in a wide variety of applications. The basic scatter plot approach is widely used and highly effective for data sets of small to moderate size. However, it shows scalability problems for data sets of increasing size, of multiple classes and of time-dependency. In this short paper, we therefore present an improved visual analysis of such point clouds. The basic idea is to monitor certain statistical properties of the data for each point and for each class as a function of time. The output of the statistic analysis is used for identification of interesting data views decreasing information overload. The data is interactively visualized using various techniques. In this paper, we specify the problem, detail our approach, and present application results based on a real world data set.

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Purpose Evaluating health information systems is an integral part of the life cycle and development of information systems as it can improve the quality of health care. The purpose of this paper is to introduce a bilingual Web-based repository of health-related software products evaluation tools. Design/methodology/approach The present paper is an applied-developmental study that includes the stages of analysis, design, implementation and evaluation procedures. By searching valid databases as well as holding focus group meetings with a group of experts, the necessary elements for designing a Web-based repository were identified, and also unified modelling language diagrams were designed by using a visual paradigm. The coding(programming) was conducted based on the Gantlet Web Systems Development Framework at the next stage. Finally, after implementing and testing the system, the content was added to the repository, and then the repository was evaluated in terms of usability testing. Findings The health informatics evaluation tools (HIET) repository provides a functional and selective environment that facilitates the sharing, online storage and retrieval of assessment tools by the scientific community. The HIET repository is easily accessible at www.hiet.ir/ The website is implemented in structured query language (MySQL), personal homepage. Hypertext Preprocessor (PHP) and Linux, Apache, MySQL, and PHP (LEMP) and supports all major browsers. Originality/value The HIET repository, as mentioned earlier, serves as an application environment for sharing, storing and online retrieving the assessment tools of health information systems. Therefore, this tool not only facilitates the search, retrieving and study of many evaluation-related papers, which are time-consuming and stressful for researchers and students but can lead to a faster and more scientific evaluation of information systems.

Purpose One of the great strides to develop a health information system is to define the requirements of the systems. This paper aims to identify and collect the requirements for designing a Web-based repository of evaluation tools for health-related software products. Design/methodology/approach The current qualitative-review study is conducted in four phases including searching databases, reviewing websites and similar repositories, holding focus group discussions with a group of experts and determining the essential requirements for designing a Web-based repository, and also drawing the unified modeling language diagrams using Visual Paradigm software for displaying the necessities which were gathered. Findings The requirements for designing a Web-based repository are provided in five main categories: technical, structural, content, legal and others. In general, creating a repository takes considerable time and effort, as well as going through the steps of the system’s life cycle. Originality/value In this study, the first and the most significant step is creating an developing a reasonable system identifying the system requirements, which is successfully conducted. The requirements given in this study will be used in the next steps, which make use of programming languages such as PHP and HTML, so as to design a Web-based repository for health product software evaluation tools.

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