Hypothetical Scenario

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Christian Von Wagner - One of the best experts on this subject based on the ideXlab platform.

Bernardette Bonello - One of the best experts on this subject based on the ideXlab platform.

David B Mcwhorter - One of the best experts on this subject based on the ideXlab platform.

  • design of soil vapor extraction systems under conditions of uncertainty
    Ground Water, 2000
    Co-Authors: David L Barnes, David B Mcwhorter
    Abstract:

    This paper proposes a risk-cost approach for the design of soil vapor extraction (SVE) systems that takes into account uncertainties in the soil properties. The proposed design methodology consists of three separate models: a soil-gas flow and vapor transport model, a parameter uncertainty model, and a decision model based on a risk-cost objective function. A description of each of these models is provided and an example using a Hypothetical Scenario is given to illustrate the use of the methodology. Results from the example show that the methodology is suited for determining the number, location, and spacing of SVE extraction wells. The methodology can also be used to size the vacuum blower to be used and to predict when the SVE system should be shut off.

  • design of soil vapor extraction systems under conditions of uncertainty
    Ground Water, 2000
    Co-Authors: David L Barnes, David B Mcwhorter
    Abstract:

    This paper proposes a risk-cost approach for the design of soil vapor extraction (SVE) systems that takes into account uncertainties in the soil properties. The proposed design methodology consists of three separate models: a soil-gas flow and vapor transport model, a parameter uncertainty model, and a decision model based on a risk-cost objective function. A description of each of these models is provided and an example using a Hypothetical Scenario is given to illustrate the use of the methodology. Results from the example show that the methodology is suited for determining the number, location, and spacing of SVE extraction wells. The methodology can also be used to size the vacuum blower to be used and to predict when the SVE system should be shut off.

Saroj Saigal - One of the best experts on this subject based on the ideXlab platform.

  • play it again sam comparison of teenagers valuation of self reported health status versus a Hypothetical Scenario sam of same health state 1653
    Pediatric Research, 1996
    Co-Authors: Saroj Saigal, William J Furlong, Peter Rosenbaum, David H Feeny, Elizabeth A Burrows
    Abstract:

    Background: There is some evidence in the literature that valuation of personal health status by patients may be higher than ratings provided for the same health state by other respondents. However, it is not known if the patients would provide similar ratings if their personal health state were presented as a Hypothetical Scenario. Objectives: To determine if there are any differences in teenagers valuation of their health-related quality of life (HRQL) based on self-report of their subjectively-defined health status (SDHS), versus the ratings provided for“Sam”, which was an objective description of their personal multi-attribute health status written as if it were a Hypothetical Scenario.Design: Health status measures of teens' own health were obtained by professional interviewers using a multi-attribute health status (HUI2) classification system. To elicit preferences, we utilized the visual analogue scaling (Feeling Thermometer) which ranks health states under conditions of certainty on a scale of 0 to 100. The respondents were asked to rank their self-reported SDHS and “Sam” (in addition to 4 other Hypothetical Scenarios of varying severity). Participants: 107 extremely low birthweight (ELBW) survivors and 108 controls (C) between 12 and 16 years of age. Neurosensory impairments were present in 24% ELBW and 2% C.Results: 69% of ELBW and 56% of C rated their own SDHS equal to or higher than “Sam” (p = 0.06). The mean value score of ELBW teenagers for SDHS HRQL was significantly higher than that of“Sam”, the Scenario about themselves (89 ± 15 vs. 83± 20, p = 0.001). The differences reported by the C group were in the same direction, although non-significant (91 ± 9 vs 89 ± 15, p = 0.10). Conclusions: Overall, a modest proportion of both cohorts rated their own HRQL equal to or higher than “Sam”, suggesting that personal experience of living in a particular health state is valued more highly than when it is imaginary. Whether the wider discrepancy between HRQL rating of SDHS and “Sam” in ELBW adolescents is due, in part, to a broader range of impairments, or a personal inability to appreciate their own limitations, is not clear. It is possible that ELBW teens value their own HRQL higher than “Sam” due to some undescribed qualities they perceive in themselves. To our knowledge comparisons like these have not been reported before.

  • ldquo play it again sam rdquo comparison of teenagers valuation of self reported health status versus a Hypothetical Scenario ldquo sam rdquo of same health state dagger 1653
    Pediatric Research, 1996
    Co-Authors: Saroj Saigal, Peter Rosenbaum, William Furlong, David Feeny, Elizabeth Burrows
    Abstract:

    Background: There is some evidence in the literature that valuation of personal health status by patients may be higher than ratings provided for the same health state by other respondents. However, it is not known if the patients would provide similar ratings if their personal health state were presented as a Hypothetical Scenario. Objectives: To determine if there are any differences in teenagers valuation of their health-related quality of life (HRQL) based on self-report of their subjectively-defined health status (SDHS), versus the ratings provided for“Sam”, which was an objective description of their personal multi-attribute health status written as if it were a Hypothetical Scenario.Design: Health status measures of teens' own health were obtained by professional interviewers using a multi-attribute health status (HUI2) classification system. To elicit preferences, we utilized the visual analogue scaling (Feeling Thermometer) which ranks health states under conditions of certainty on a scale of 0 to 100. The respondents were asked to rank their self-reported SDHS and “Sam” (in addition to 4 other Hypothetical Scenarios of varying severity). Participants: 107 extremely low birthweight (ELBW) survivors and 108 controls (C) between 12 and 16 years of age. Neurosensory impairments were present in 24% ELBW and 2% C.Results: 69% of ELBW and 56% of C rated their own SDHS equal to or higher than “Sam” (p = 0.06). The mean value score of ELBW teenagers for SDHS HRQL was significantly higher than that of“Sam”, the Scenario about themselves (89 ± 15 vs. 83± 20, p = 0.001). The differences reported by the C group were in the same direction, although non-significant (91 ± 9 vs 89 ± 15, p = 0.10). Conclusions: Overall, a modest proportion of both cohorts rated their own HRQL equal to or higher than “Sam”, suggesting that personal experience of living in a particular health state is valued more highly than when it is imaginary. Whether the wider discrepancy between HRQL rating of SDHS and “Sam” in ELBW adolescents is due, in part, to a broader range of impairments, or a personal inability to appreciate their own limitations, is not clear. It is possible that ELBW teens value their own HRQL higher than “Sam” due to some undescribed qualities they perceive in themselves. To our knowledge comparisons like these have not been reported before.

Stephen P Halloran - One of the best experts on this subject based on the ideXlab platform.

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