longitudinal
RSS longitudinalEstimation of Firewall Loads Due to Soft Soil Impact
White Paper All nose-down impacts are of interest, but those into soft soil represent the critical condition because of the potentially large longitudinal forces associated with the momentum transfer of the displaced soil. [30 Jun 2008]
Data Warehousing - Understanding Its Role in a Business Management Architecture
White Paper But because decision support applications must examine corporate data in a longitudinal fashion, building a data warehouse demands an outlook and a skill set that is dramatically different than those for building classical online transaction... [10 Apr 2008]
Stockholm County Council Creates Solid Foundation for Improving Patient Care and Optimizes IT Resources
White Paper The challenge was to develop a single, longitudinal electronic healthcare record for every patient, enabling a consistent 'continuum of care' throughout the patient's lifetime and provide healthcare personnel with rapid access to a patient's... [20 Jul 2007]
Regression Splines With Longitudinal DATA
White Paper To account for the longitudinal nature of the data, a mixed model analysis implemented using SAS PROC MIXED is commonly used. It is typical to make comparisons between dose or treatment groups, possibly controlling for demographic variables. [09 Jun 2007]
Graphing Longitudinal Data: Deaf Children in the "Children of the National Longitudinal Survey of Youth"
White Paper By using SAS and its graphing capabilities exploratory analysis of longitudinal data is for more capable then other methods. This visualization makes longitudinal analysis easier to grasp. Comparing means between groups is too weak of a comparison... [09 Jun 2007]
Marginal Interpretation of Subject-Specific Curves: Logistic-Normal Regression
White Paper The authors apply this concept to a binary longitudinal data set. The results suggest that the percentile curves complement the analysis of longitudinal data and permit a marginal interpretation of subject-specific parameters. [02 Jun 2007]
A Study on the Effects of Personalization and Task Information on Implicit Feedback Performance
White Paper Interaction logs gathered during a longitudinal naturalistic study of online information-seeking behavior are used as stimuli for the algorithms. While Implicit Relevance Feedback (IRF) algorithms exploit users' interactions with information to... [31 May 2007]
Enhancing HMIS Data Quality
White Paper Finding solutions to homelessness requires quality system-wide, longitudinal data. Collecting quality information in any type of social research is a challenging task; it is especially challenging when collecting data on people experiencing... [05 Feb 2007]
Crafting Rules: Context-Reflective Data Quality Problem Solving
White Paper The study discussed in this paper analyzes data quality activities at five organizations via a five-year longitudinal study. Motivated by the growing importance of data quality in data-intensive, global business environments and by burgeoning data... [01 Feb 2007]
Analyzing Multivariate Longitudinal Data Using SAS
White Paper Comparing to the traditional univariate longitudinal data, the analysis of multivariate longitudinal data can be challenging because the variances of errors are likely to be different for different markers, the errors are likely to be correlated... [31 Jan 2007]
Archival Documentation of a SAS Database Via the Web
White Paper The Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study was a multi-center observational study funded by the National Eye Institute to characterize vision, corneal changes, and quality of life in keratoconus patients, and to... [31 Jan 2007]
Fitting Longitudinal Mixed Effect Logistic Regression Models With the NLMIXED Procedure
White Paper The authors lately used the NLMIXED procedure to perform longitudinal logistic regressions in which a random intercept was included to induce a compound symmetry covariance structure for repeated measures on individual subjects. [30 Jan 2007]
Data Quality Campaign: Using Data to Improve Student Achievement
White Paper No longitudinal information system will ever be truly "Complete," since information needs and reports produced by those systems will change and grow as the culture and business of education changes over time. [30 Jan 2007]
Choice Models and Customer Relationship Management
White Paper In the context of choice, this implies designing longitudinal models of choice over the breadth of the firm's products and using them prescriptively to increase the revenues from customers over their lifecycle. [10 Jan 2007]
Mixed Model Influence Diagnostics
White Paper Moreover, in repeated measures or longitudinal studies, one is often interested in multivariate influence, rather than the impact of isolated points. Linear models for uncorrelated data have well established measures to gauge the influence of one... [26 Dec 2006]
