John E Overall
Datos Biográficos
| ID | 280700 |
|---|---|
| NOMBRE | John E Overall |
| NOMBRES | John E |
| APELLIDO | Overall |
| FIRMA | OVERALL J E |
| AFILIACIONES | The University of Texas Medical Branch at Galveston |
| VERIFICADO | No |
| TOTAL DE OBRAS | 67 |
| TOTAL DE CITAS | 47 |
| TOTAL COMO AUTOR | 67 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 1959 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2015 |
| ÍNDICE H | 3 |
Evaluations of Pharmacotherapy in Cooperative Studies
The Brief Psychiatric Rating Scale in Psychopharmacology Research
The Case for Use of Simple Difference Scores to Test the Significance of Differences in Mean Rates of Change in Controlled Repeated Measurements Designs
A previous Monte Carlo study examined the relative powers of several simple and more complex procedures for testing the significance of difference in mean rates of change in a controlled, longitudinal, treatment evaluation study. Results revealed that the relative powers depended on the correlation structure of the simulated repeated measurements. Tests on dropout-weighted linear slope coefficients fitted to all of the available measurements for …
Last-observation-carried-forward (Locf) and tests for difference in mean rates of change in controlled repeated measurements designs with dropouts
Tests That are Robust against Variance Heterogeneity in k × 2 Designs with Unequal Cell Frequencies
Heterogeneity of variance produces serious bias in conventional analysis of variance tests of significance when cell frequencies are unequal. Welch in 1938 and 1947 proposed an adjusted t test for the difference between two means when cell frequencies and population variances are both unequal. This article describes two ways to use the Welch t to evaluate the significance of the main effect for two treatments across k levels of a concomitant fact…
Power of a Test That is Robust against Variance Heterogeneity
Welch (1947) proposed an adjusted t test that can be used to correct the serious bias in Type I error protection that is otherwise present when both sample sizes and variances are unequal. The implications of the Welch adjustment for power of tests for the difference between two treatments across k levels of a concomitant factor are evaluated in this article for k x 2 designs with unequal sample sizes and unequal variances. Analyses confirm that,…
An Investigation of the Structural Validity of Loevinger's Model and Measure of Ego Development
This study demonstrates the use of structural equation modeling for investigating a hierarchical model of personality based on Loevinger's (1976) conceptualization. This model was constructed to have a multifactorial and hierarchical structure in which the ego development construct served as the source of covariation for specific personality constructs of impulse control, interpersonal style, conscious preoccupations, and cognitive style. This mo…
Formulae for Estimating Rater Reliability from the Significance of Treatment Effects
The ability to discriminate true treatment effects in clinical research depends on the reliability of measurements. Rating scales are often used to assess treatment effects, but raters differ in their individual reliabilities. Rather than considering a rating instrument to have inherent reliability, it is important to focus on the reliability of the instrument in the hands of particular raters. Formulae for estimating individual rater reliabiliti…
Comparison of a Two-Stage and Three-Stage Interim-Analysis Procedure
A statistical model for combining p values from multiple tests of significance is used to define rejection and acceptance regions for two-stage and three-stage sampling plans. Type I error rates, power, frequencies of early termination decisions, and expected sample sizes are compared. Both the two-stage and three-stage procedures provide appropriate protection against Type I errors. The two-stage sampling plan with its single interim analysis en…
Comparison of a Two-Stage and Three-Stage Interim-Analysis Procedure
Tests of Significance for Differences in Counts of Rare Events in Two Treatment Groups
Counts of rare events tend to have Poisson or J-shaped distributions that render parametric assumptions questionable. Six different methods for testing the significance of the difference between location parameters for two such distributions are evaluated in this article. A binomial test for the difference between means is known to be the most powerful unbiased test when population distributions are truly Poisson; however, it appears extremely no…
Small-sample tests for homogeneity of response probabilities in 2 × 2 contingency tables
Small-sample tests for homogeneity of response probabilities in 2 × 2 contingency tables
Beware of a half-tailed test
Beware of a half-tailed test
MMPI-168 Factor Score Profiles for Major Diagnostic Groups
The purpose of the present study was to examine the MMPI-168 factor score profiles for groups of psychiatric patients whose clinical scale score profiles matched prototype patterns for schizophrenia ( N = 199), depression ( N = 215), and personality disorder ( N = 126). The MMPI-168 factor score profiles for a sample of 27 psychiatric outpatients meeting DSM III criteria for borderline personality were also examined. Suggestion of significant psy…
An Investigation Of The Consistency Of Diagnostic Concepts Among Five Child And Adolescent Psychiatrists
Five experienced child and adolescent psychiatrists provided descriptions on a 63-item symptom and behavior rating scale of their concepts of typical patients belonging to 18 different diagnostic groups. An empirical classification of the 18 diagnoses into six major categories was accomplished by transposed (Q-type) factor analysis of the mean profiles for the 18 childhood psychiatric disorders. The consistency of the diagnostic concepts held by …
Simple F Tests for Main Effects and Interactions in 2 × 2 × k Contingency Tables
A method of controlling for the effects of a nuisance variable in testing the significance of treatment effects on a discrete binary response is described. Proportions of “success” responses in two treatment groups are standardized relative to an estimate of the sampling variance at each level of the concomitant variable, and an unweighted-means analysis of variance is used to test the main effect for treatments and the interaction of treatments …
Comparison of two strategies for analysis of variance in nonorthogonal designs
Comparison of two strategies for analysis of variance in nonorthogonal designs
Power of chi-square tests for 2 × 2 contingency tables with small expected frequencies
Power of chi-square tests for 2???2 contingency tables with small expected frequencies
Common Misconceptions Concerning The Analysis Of Covariance
Four misconceptions about the requirements for proper use of analysis of covariance (ANCOVA) are examined by means of Monte Carlo simulation. Conclusions are that ANCOVA does not require covariates to be measured without error, that ANCOVA can be used effectively to adjust for initial group differences that result from nonrandom assignment which is dependent on observed covariate scores, that ANCOVA does not provide unbiased estimates of true tre…
Nonrandom assignment and the analysis of covariance
Adequacy of the Brief Psychiatric Rating Scale for Distinguishing Lesser Forms of Psychopathology
The adequacy of the Brief Psychiatric Rating Scale for distinguishing among lesser forms of psychopathology, as well as among the more serious forms, was investigated. 31 psychiatrists provided symptom descriptions for 13 clinical syndromes which were selected to span the full range of inpatient and outpatient psychopathology. The symptom descriptions included, in addition to the standard 18 scales of the rating scale, 24 additional symptom- and …
Concerning least squares analysis of experimental data
Unreliability of difference scores
The use of difference scores to measure change in experimental research has often been faulted on the grounds that errors of measurement are additive. In research concerned with differences between experimental treatment groups, the loss in reliability due to calculation of difference scores is not a valid concern because the power of tests of significance is maximum when the reliability of the difference scores is zero
Note on the scientific status of factors
Multivariate analysis of variance by multiple regression methods
Last-observation-carried-forward (Locf) and tests for difference in mean rates of change in controlled repeated measurements designs with dropouts
Factor analysis of rank-ordered data
Reassertion of the paradoxical power of tests of significance based on unreliable difference scores
Implications of Recency Effects for Probability Learning Theories
Implications of Recency Effects for Probability Learning Theories
The Effect of Chronic Whole-Body Irradiation on Peripheral Cue Associations
Correlates of Resistance to Extinction in Probability Learning
Cognitive-Postremity Predictions of Learning Behavior
(1960). Cognitive-Postremity Predictions of Learning Behavior. The Journal of General Psychology: Vol. 62, No. 2, pp. 189-197
Basic dimensions of change in the symptomatology of chronic schizophrenics
The Brief Psychiatric Rating Scale
Orthogonal Factors and Uncorrelated Factor Scores
Orthogonal Factors and Uncorrelated Factor Scores
A Factor Analysis of Several Measures of Choice Behavior from a Probability Learning Situation
(1962). A Factor Analysis of Several Measures of Choice Behavior from a Probability Learning Situation. The Journal of General Psychology: Vol. 66, No. 1, pp. 115-128
The California F Scale and Attitudes toward Medication in Chronic Withdrawn Schizophrenic Patients
(1963). The California F Scale and Attitudes toward Medication in Chronic Withdrawn Schizophrenic Patients. The Journal of General Psychology: Vol. 68, No. 2, pp. 213-225
Responses of Rhesus Monkeys to Probabilistic Sequential Dependencies
Forty-nine rhesus monkeys were divided into two treatment groups of 24 and 25 animals. Two identical stimulus objects were presented at each trial in a Wisconsin General Test Apparatus with reward presented for an equal number of trials on the left and right sides. For one group, the sequence of reward placements contained a positive contingency; for the other group, it contained a negative contingency. The distribution of responses for sophistic…
A Masculinity-Femininity Scale for the Kuder Preference Record
(1963). A Masculinity-Femininity Scale for the Kuder Preference Record. The Journal of General Psychology: Vol. 69, No. 2, pp. 209-216
Note on the scientific status of factors
Note on multivariate methods for profile analysis
Reliability of Composite Ratings1
Design of experiments to maximize power relative to cost
Subjective Correlates of Clinically Manifested Anxiety and Depression
Relationships between clinical ratings of psychiatric symptomatology and subjective patient responses to 166 selected MMPI items are examined. The 20 MMPI items found to correlate most highly with clinical ratings of anxiety, depressive mood and other depression-related variables are considered in detail. Subjective correlates of clinical ratings of anxiety concern effects of the anxiety on the individual and not the subjective experience of anxi…
Sample Size Required to Observe at Least k Rare Events
Tables based upon Poisson distribution are presented which specify total sample size adequate to ensure ( p > .95) that a certain specified number of rare events will be observed. The tables are useful in planning sampling surveys where special interest is in obatining at least a specified number of cases of special research interest. The tables can also be used as basis for rejecting the hypothesis that occurrence rate for rate event exceeds som…
Estimating Individual Rater Reliabilities from Analysis of Treatment Effects
Cluster Oriented Factor Solutions
Good simple structure is the natural consequence of fitting hyperplanes to cluster centroids in analyses of data in which distinct cluster configuration exists. The oblique powered vector factor analysis utilizes a preliminary direct orthogonal solution to identify clusters, passes primary axes through the cluster centroids and produces final oblique reference structure by simple trans- formation. The hyperplane for each oblique factor is fitted …
Classical statistical hypotheses testing within the context of Bayesian theory
Concerning least squares analysis of experimental data
Background Variables and Outpatient Psychopathology
This study was designed to evaluate the relevance of a number of background variables with regard to psychopathology of outpatients. Some 70 items of personal and social history plus BPRS symptom rating profiles recorded by 2 different professional observers were obtained for a sample of 729 adult psychiatric outpatients. Personal and social characteristics of the patient himself and types of problems encountered by the patient in his social cont…
Preplanned and Postplanned Cities
Comparison of Error Rates Associated With Alternative MMPI Profile Classification Schemes
Psychology (53 obras) · Mathematics (45 obras) · Statistics (45 obras) · Econometrics (26 obras) · Computer Science (21 obras) · Clinical Psychology (15 obras) · Psychiatry (13 obras) · Social Psychology (13 obras) · Medicine (12 obras) · Statistical Methods in Clinical Trials (12 obras)