Mari Palta

University of Wisconsin–Madison

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Maureen A. Smith

Cochrane

Dennis G. Fryback

University of Wisconsin–Madison

Terry Young

University of Wisconsin–Madison

Ronald Klein

University of Chicago

Erika W. Hagen

University of Wisconsin–Madison

Paul E. Peppard

University of Wisconsin–Madison

Mona Sadek‐Badawi

University of Wisconsin–Madison

Tamara J. LeCaire

University of Wisconsin–Madison

Marlowe W. Eldridge

University of Wisconsin–Madison

Kara N. Goss

The University of Texas Southwestern Medical Center

Cooperative Institutions

University of Wisconsin–Madison

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Madison Group (United States)

University of Wisconsin Health

UW Health University Hospital

Highland Community College - Illinois

William S. Middleton Memorial Veterans Hospital

University of Wisconsin Carbone Cancer Center

University of Wisconsin System

National Institutes of Health

Johns Hopkins University

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The Maximum Likelihood Approach to Ordinary Regression

Wiley series in probability and statistics (2003)

Mari Palta

We introduce the likelihood idea for binary outcome. The concept of density is introduced for continuous outcome, and the formula for the normal density is provided. The likelihood is maximized using derivatives for ordinary regression analysis with normality assumption on the error term. Important properties of maximum likelihood are defined, PROC MIXED is introduced. Systolic blood pressure is regressed on age.

10.1002/0471467979.ch2

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Tailoring Resources to Help Children and Parents Manage Type 1 Diabetes

Elizabeth Cox Mari Palta Betty Chewning Tim Wysocki Tosha B. Wetterneck

How can people use the results?Researchers could use results from this study to plan studies on other ways to help patients and families manage diabetes.They also could look at why the group sessions helped some patients more than usual care.

10.25302/8.2019.ih.13046279

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Citations (1)

INSTRUMENTAL VARIABLE AND GMM ESTIMATION FOR PANEL DATA WITH MEASUREMENT ERROR

Zhiguo Xiao Jun Shao Mari Palta

Panel data allow correction for measurement error without assuming a known measurement error covariance matrix or using additional validation/replic- ation data to estimate the measurement error covariance matrix. Griliches and Hausman (1986) proposed using the generalized method of moments (GMM) or op- timal weighting to efficiently combine instrumental variable (IV) estimators. Wans- beek (2001) applied GMM based on moment conditions expressed in the form of the Kronecker product. This paper studies some issues crucial to applications of these two approaches, including the estimability of the regression parameter un- der Griliches and Hausman's or Wansbeek's approach, how to choose instruments, what is the optimally weighted IV estimator, how to explicitly construct GMM estimators, how to remove the redundancy of the moment conditions constructed by Wansbeek (2001), and the existence of optimal GMM estimators. We unify Griliches and Hausman's and Wansbeek's approaches by establishing their equiv- alence. We also consider models with exogenous regressors and models with non- classical assumptions. We apply the methods in this paper to revisit an investment controversy, viz., whether financially constrained firms respond to internal funds such as cash flow more sensitively than financially unconstrained firms.

Instrumental variable

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Race and preference-based health-related quality of life measures in the United States

Quality of Life Research (2010)

Claudia Cristina de Aguiar Pereira Mari Palta John Mullahy Dennis G. Fryback

White (mutation)

Health Utilities Index

Race and health

10.1007/s11136-010-9813-3

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Citations (37)

Rates, Risks, Measures of Association and Impact

Springer eBooks (2005)

Jacques Bénichou Mari Palta

10.1007/3-540-26577-5_3

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Citations (1)

Use of Steroids and Behavior Outcomes Among Very Low Birth Weight Children

American Journal of Epidemiology (2006)

Erika W. Hagen Mari Palta Aggie Albanese Mona Sadek‐Badawi

10.1093/aje/163.suppl_11.s20-a

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Diet and Nuclear Lens Opacities

American Journal of Epidemiology (1995)

J. A. Mares-Periman William E. Brady Ronald Klein Ronald Klein G. J. Haus

Relations between diet and nuclear opacities in the lens of the eye were investigated in a population-based cohort of middle-aged and older adults who lived in Beaver Dam, Wisconsin. Nuclear sclerosis was assessed from photographs of the lens taken during 1988–1990 in 1,919 persons in the Beaver Dam Eye Study. Diets in the past (1978–1980) were assessed retrospectively with the use of a food frequency questionnaire in home interviews. Relations with intake of foods and nutrients were evaluated using logistic regression analyses. In men, after controlling for age, smoking, and heavy drinking, intakes of numerous nutrients in the highest versus lowest quintile were associated with 40‐50 percent reduced odds of more severe nuclear sclerosis. Relations with some nutnents (vitamins A, C, and E, riboflavin, thiamin, niacin) were at least partly explained by previously identified inverse associations with multivitamin use. Relations with other nutrients (folate, α-carotene, and dietary fiber) appeared to reflect associations with intake of foods, particularly vegetables. Inverse associations with individual nutrients and foods were often weaker or nonexistent in women. These data indicate that the intake of vitamin supplements (in men and women) and certain foods (particularly in men) may explain associations of several nutrients with risk for nuclear sclerosis.

Niacin

Multivitamin

10.1093/aje/141.4.322

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Women’s Sexual Function, Satisfaction, and Perceptions After Starting Long-Acting Reversible Contraceptives

Obstetrical & Gynecological Survey (2017)

Jenny A. Higgins Jessica N. Sanders Mari Palta David K. Turok

(Abstracted from Obstet Gynecol 2016;128:1143–1151) The sexual acceptability of contraceptives or how contraception affects women’s sexual experiences have been rarely assessed. No studies have addressed the acceptability of long-acting reversible contraceptives (LARCs), the most effective contraceptive methods available.

Long-Acting Reversible Contraception

10.1097/01.ogx.0000515664.27489.13

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Citations (7)

Biological and steroid use in relationship to quality measures in older patients with inflammatory bowel disease: a US Medicare cohort study

BMJ Open (2015)

Sophia L. Johnson Christie M. Bartels Mari Palta Carolyn T. Thorpe Jennifer M. Weiss

Objectives To examine the frequency and predictors of antitumour necrosis factor (TNF) use, and to describe steroid utilisation among US patients with inflammatory bowel disease (IBD) aged 65 years and older prior to the publication of a new Medicare quality measure calling for the use of anti-TNFs and other steroid-sparing agents. Design Retrospective cohort study. Setting This study utilised 2006–2009 claims data for a national sample of Medicare beneficiaries. Participants Patients with IBD (>1 claim for ICD codes 555.xx, 556.xx) without anti-TNF contraindications, enrolled in Medicare parts A and B ≥12 months and part D ≥6 months were included (n=8502). Outcome measures We estimated incidence rate ratios (IRR) and 95% CIs predicting new anti-TNF therapy using multivariable Poisson regression. Results This nationally representative study of older patients with IBD estimated that only 3.7% received anti-TNFs. New anti-TNF use (1.4%) was associated with younger age, absence of Medicaid coverage, hospitalisation, and higher preceding use of burst (IRR=2.35, CI 1.59 to 3.47) and maintenance steroids (IRR=2.40, CI 1.05 to 5.48). Among anti-TNF users, we observed high rates of concurrent maintenance steroid use (19%). Conclusions Anti-TNF use was very low in this population of older patients with IBD and, importantly, was often combined with maintenance steroid use despite guidelines suggesting reduced needs. Expanding IBD-specific quality measures to include steroid taper plans may cue appropriate maintenance regimens that include anti-TNFs and other steroid sparing agents while reducing protracted concomitant steroid use as intended by current quality measures.

Rate ratio

10.1136/bmjopen-2015-008597

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Citations (30)

Random Effects

Wiley series in probability and statistics (2003)

Mari Palta

We explain random effects from different viewpoints, including as omitted covariates that are not confounders. Models are explained as both two-stage (hierarchical) and as overall models with variance components. Random intercept model is shown to be equivalent to compound symmetry model. PROC MIXED commands for random effects are introduced. Random slopes are introduced. Likelihood ratio tests are discussed for choosing random effects structure. Results based on random effects and other covariance structures are compared for the blood pressure data. Empirical Bayes estimation of individual random effects is briefly discussed. The distribution of random effects is examined for the blood pressure data.

Random error

10.1002/0471467979.ch10

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