Bifactor Models, Explained Common Variance (ECV), and the Usefulness of Scores from Unidimensional Item Response Theory Analyses

Item response data can be classified on a dimensionality continuum - which extends from theoretically unidimensional through essentially unidimensional to multidimensional. Data found to be essentially unidimensional are suitable for a UIRT model, whereas data evaluated to be too multidimensional are more appropriately modeled using MIRT. This investigation takes a theoretical, analytical approach to studying the relationship between a recently introduced index of dimensionality - estimated common variance (ECV) - and a criterion to determine the justifiability of reporting subscores - proportional reduction in mean squared error (PRMSE). Based on ECV values, recommendations are given for choosing between UIRT and MIRT models, as well as whether subscores have added value over a total score. Future research should include simulations and real data analyses.Master of Art

Mode effects between computer self-administration and telephone interviewer-administration of the PROMIS® pediatric measures, self- and proxy report

To test equivalence of scores obtained with the PROMIS® pediatric Depressive Symptoms, Fatigue, and Mobility measures across two modes of administration: computer self-administration and telephone interviewer-administration. If mode effects are found, to estimate the magnitude and direction of the mode effects

Psychometric properties of the PROMIS® pediatric scales: precision, stability, and comparison of different scoring and administration options

The objectives of the present study are to investigate the precision of static (fixed-length) short forms versus computerized adaptive testing (CAT) administration, response pattern scoring versus summed score conversion, and test-retest reliability (stability) of the Patient Reported Outcomes Measurement Information System (PROMIS®) pediatric self-report scales measuring the latent constructs of depressive symptoms, anxiety, anger, pain interference, peer relationships, fatigue, mobility, upper extremity functioning and asthma impact with polytomous items

PROMIS® Parent Proxy Report Scales for children ages 5–7 years: an item response theory analysis of differential item functioning across age groups

The objective of the present study is to describe the extension of the National Institutes of Health (NIH) Patient Reported Outcomes Measurement Information System (PROMIS®) pediatric parent proxy-report item banks for parents of children ages 5–7 years, and to investigate differential item functioning (DIF) between the data obtained from parents of 5–7 year old children with the data obtained from parents of 8–17 year old children in the original construction of the scales

A nem (ivar) befolyásolásának lehetőségei, gyakorlata emlős háziállatokban

Manapság elsősorban gazdasági tényezők indokolják az elvárt ivarú utód születését. Egy új eljárás alapján, mesterséges termékenyítéssel, lehetőségünk van a kívánt ivari kromoszómát hordozó spermium beültetésére. Az ivarspecifikus sperma térhódítása az 1980-as évektől kezdődött, és mostanra már számos állatfajban alkalmazzák. A dolgozat a kereskedelmi forgalomba kerülő szexált sperma paramétereit vizsgálja.MSc/MABiológusg

Estimating minimally important difference (MID) in PROMIS pediatric measures using the scale-judgment method.

To assess minimally important differences (MID) for several pediatric self-report item banks from the National Institutes of Health (NIH) Patient-Reported Outcomes Measurement Information System® (PROMIS®)

Mode effects between computer self-administration and telephone interviewer-administration of the PROMIS® pediatric measures, self- and proxy report

OBJECTIVE: To test equivalence of scores obtained with the PROMIS(®) pediatric Depressive Symptoms, Fatigue, and Mobility measures across two modes of administration: computer self-administration and telephone interviewer-administration. If mode effects are found, to estimate the magnitude and direction of the mode effects. METHODS: Respondents from an internet survey panel completed the child self-report and parent proxy-report versions of the PROMIS(®) pediatric Depressive Symptoms, Fatigue, and Mobility measures using both computer self-administration and telephone interviewer-administration in a crossed counterbalanced design. Pearson correlations and multivariate analysis of variance (MANOVA) were used to examine the effects of mode of administration as well as order and form effects. RESULTS: Correlations between scores obtained with the two modes of administration were high. Scores were generally comparable across modes of administration, but there were some small significant effects involving mode of administration; significant differences in scores between the two modes ranged from 1.24 to 4.36 points. CONCLUSIONS: Scores for these pediatric PROMIS measures are generally comparable across modes of administration. Studies planning to use multiple modes (e.g., self-administration and interviewer-administration) should exercise good study design principles to minimize possible confounding effects from mixed modes