Search for dissertations about: "Hans Öhman"

Showing result 1 - 5 of 8 swedish dissertations containing the words Hans Öhman.

  2. 1. Studies on the pH gradient in normal and ichthyotic human skin

    Author : Hans Öhman; Linköpings universitet; []
    Keywords : keratinization; hyperkeratosis; desquamation; filaggrin; cholesterolsulfate; tape stripping; MEDICINE; MEDICIN;

    Abstract : In search for pathogenetic mechanisms underlying hyperkeratosis, we examined the pH gradient across the stratum corneum in normal and ichthyotic skin. Twenty students and employees, (12 men and 8 womenaged 25-69 years) served as controls. Patients with ichthyoses were recruited from the outpatient clinic (13 men aged 12-71 years). READ MORE

  4. 2. Contributions to generalized Wilcoxon rank tests

    Author : Marie-Louise Öhman; Hans Nyquist; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Censored data rank sum tests; Gehan s test; Generalized Wilcoxon test; Jackknifing; Two sample problem; Simulation; Survival data; Variance estimation; Influence function; Gross error sensitivity; Sensitivity curve; Misclassification; Statistics; computer and systems science; Statistik; data- och systemvetenskap; Statistics; statistik;

    Abstract : In unbalanced small sample size problems with right censorings, the variance estmators of linear rank statistics, may be biased. This is the case with the commonly applied variance estimators for the generalized Wilcoxon rank test statistics of Gehan and Prentice. READ MORE

  5. 3. Aspects of analysis of small-sample right censored data using generalized Wilcoxon rank tests

    Author : Marie-Louise Öhman; Hans Nyquist; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Censored generalized Wilcoxon rank test statistics; Variance estimation; Jackknifing; Influence function; Gross error sensitivity; Break-Down point; Sensitivity curve; Location parameter estimation; Product-Limit estimator and Monte-Carlo Simulation; Statistics; computer and systems science; Statistik; data- och systemvetenskap; Statistics; statistik;

    Abstract : The estimated bias and variance of commonly applied and jackknife variance estimators and observed significance level and power of standardised generalized Wilcoxon linear rank sum test statistics and tests, respectively, of Gehan and Prentice are compared in a Monte Carlo simulation study. The variance estimators are the permutational-, the conditional permutational- and the jackknife variance estimators of the test statistic of Gehan, and the asymptotic- and the jackknife variance estimators of the test statistic of Prentice. READ MORE

  6. 4. Women's experiences and reactions when a fetal malformation is detected by ultrasound examination

    Author : Nina Asplin; Susanne Georgsson Öhman; Hans Wessel; Lena Marions; Christine Rubertsson; Sophiahemmet Högskola; Karolinska Institutet; Karolinska Institutet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Prenatal diagnosis; Ultrasound examination; Information; Decision-making; Prenatal depression; Postnatal depression; Anxiety; Attachment; Care; prenatal diagnosis;

    Abstract : Background: Second trimester ultrasound examination among pregnant women in Sweden is almost universal. The detection of a fetal malformation on ultrasound puts health care providers and pregnant women in a difficult and precarious situation. READ MORE

  7. 5. In the mind of the property appraiser : Studies of commercial property valuation

    Author : Lina Bellman; Peter Öhman; Hans Lind; Neil Crosby; Mittuniversitetet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Behavioural property research; education; information; profession; property appraisers; standards and methods; the repertory grid technique; valuation process; Fastighetsbeteendeforskning; fastighetsvärderare; gridteknik; information; profession; standarder och metoder; utbildning; värderingsprocessen;

    Abstract : A transparent market provides participants with as much information as possible. In Sweden, where the environment of commercial properties is highly transparent various actors still need to minimise some continuing information asymmetry, and one possibility is to hire property appraisers. READ MORE