scholarly journals Application of multivariate analysis of vari-ance (MANOVA) to distance refractive vari-ability and mean distance refractive state

2006 ◽  
Vol 65 (2) ◽  
Author(s):  
S Abelman
Keyword(s):  
Multivariate Analysis ◽  
Analysis Of Variance ◽  
Refractive State ◽  
Experimental Trial ◽  
Level Of Confidence ◽  
Significant Difference ◽  
Sample Data ◽  
Before And After ◽  
Multiple Measurements

Refractive state can be regarded as a dynam-ic quantity. Multiple measurements of refractive state can be determined easily and rapidly on a number of different occasions using an autore-fractor. In an experimental trial undertaken by Gillan, a 30-year-old female was subjected to 30 autorefractor measurements each taken at vari-ous intervals before and after the instillation of Mydriacyl 1% (tropicamide) into her right eye. The purpose of this paper is to apply multivar-iate analysis of variance (MANOVA) to Gillan’s sample data in order to assess whether instillation of Mydriacyl into the eye affects variability of distance refractive state as well as mean distance refractive state as measured by an autorefractor. In  five  of  the  seven  cases  where  pairwise hypotheses  tests  were  performed,  it  is  con-cluded that at a 99% level of confidence there is no difference in variability of distance refrac-tive state before and after cycloplegia. In two of the three cases where MANOVA was applied, there is a significant difference at a 95% and at a 99% level of confidence in both variability of distance refractive state and mean distance refractive  state  with  and  without  cycloplegia.

Comparison of Four MANOVA Test Statistic for Pig Production in Delta State, Nigeria

2021 ◽  
Vol 6 (5) ◽  
pp. 43-49
Author(s):  
J. M. Aniesedo ◽  
C. N. Okoli
Keyword(s):  
Multivariate Analysis ◽  
Analysis Of Variance ◽  
Multivariate Normality ◽  
Secondary Source ◽  
Multivariate Analysis Of Variance ◽  
Test Statistic ◽  
Pig Production ◽  
Normality Test ◽  
Significant Difference ◽  
The Impact

This study used the multivariate analysis of variance (MANOVA) test statistic to examine the impact of three categories feed used in the production of pig in Delta State. The multivariate test statistic considered are the Pillai – Bartlett trace, Wilks’ Test Statistic, Roy’s Largest Root Test Statistic, and the Lawley- Hotelling (LH) Statistic. The objectives include to: evaluate the robustness of the four Multivariate Analysis of Variance test statistics to ensure that the best is employed in multivariate analysis to guarantee most useful result in pig production; determine the relatively efficient test statistic for pig production; and determine the test statistic that is consistent across the sample sizes. Secondary source of data collection was used to obtain the data required for the analysis. The outcome of the study showed that the obtained data was multivariate normally distributed based on the result of the asymmetry-based multivariate normality test and the multivariate normality test based on the kurtosis test which makes the data suitable parametric multivariate method such as multivariate analysis of variance (MANOVA). The results show that the Wilks and Roy tests found a significant difference for the intercept. While the Pillai and LH tests could not find any significance. The Roy test was also found to be significant for feed one, feed two, and feed three. The Wilks and Roy tests also turned out to be significant differences for the intercept. All test measures showed significance for feed one. The Wilks and Roy tests also showed a significant difference for feed two, while all test measures found a significance for feed one. Another result showed that none of the tests found significance for the interaction between feed one and two, while the Roy test found significance for the interaction between feed one and three, feed two and three and feed one, two and three. The performance of the test for evaluating the performance of feeds for pig production with/without considering interactions was found to be in the following order of magnitude: Roy, Wilks and Pilla = LH. This result implies that the Roy method, with or without consideration of the interaction, has a better performance of the test than the other methods considered in the study.

Relationship between the Desire for Anonymity and Responses to a Questionnaire on Satisfaction with University

1978 ◽  
Vol 42 (1) ◽  
pp. 259-261 ◽  
Author(s):  
David Watkins
Keyword(s):  
Multivariate Analysis ◽  
Analysis Of Variance ◽  
Multivariate Analysis Of Variance ◽  
Significant Difference ◽  
The University

The responses of 363 students who supplied their names on a survey of attitude toward the university were compared to those of 61 respondents who chose to remain anonymous. Multivariate analysis of variance yielded no significant difference between the responses of the two groups.

scholarly journals Cognitive flexibility of smokers in the context of social anxiety

2020 ◽  
pp. 93-99
Keyword(s):  
Multivariate Analysis ◽  
Social Anxiety ◽  
Analysis Of Variance ◽  
Cognitive Flexibility ◽  
Univariate Analysis ◽  
Multivariate Analysis Of Variance ◽  
Nicotine Abuse ◽  
Significant Difference ◽  
Wilks Lambda ◽  
Study Population

Background: The cognitiveCognitive dysfunction may be an important factor in smoking and nicotine abuse. However, there are very few studies that have examined the effects of psychiatric conditions on the cognitive flexibility of smokers. Objectives: This research was conducted with the aim of examination theto examine cognitive flexibility (perceive theperceived controllability and cognitive alternatives) ofamong smokers in the context of with social anxiety. MaterialMaterials and methods: The research was a study withpresent causal-comparative design. The populationstudy was allconducted on 60 smoker students ofstudying at Arak University, Arak, Iran, in 2018-2019 years. For selecting the research sample the. The study population was selected using the purposive sampling was usedtechnique. At first, the participants completed the Social Phobia Inventory (SPIN) and Cognitive Flexibility Inventory (CFI).. Then, based on the cutoff point scores of SPIN (19 to above),≤), the participants were divided into two smoker groups (n=30 in each group) were selected: smoker groupsof smokers with and without social anxiety. (n=30 in each group). Finally, these groups were compared in perceive the terms of perceived controllability and cognitive alternatives by Multivariate Analysis of Variance (MANOVA).using the multivariate analysis of variance. Results: The results indicated a significant difference in the linerlinear composition of the dependent variables ofin the two groups (wilks,Wilks’ lambda= 0/.799, F50,2= 6/.726, p= P=0/.004). UnivariateThe results of the univariate analysis of variance indicated that the smoker group with social anxiety had lower perceive theperceived controllability and cognitive alternatives, compared to the smoker group without social anxiety. Conclusion: In generalAs the findings indicated, the level of cognitive flexibility in the smokers with and without social anxiety iswas different. Therefore, it is necessary to consideringconsider the evaluation and treatment of cognitive deficits in smokers based on their level of social anxiety.

Benthic assemblages in Utah headwater streams with and without trout

1993 ◽  
Vol 71 (5) ◽  
pp. 896-900 ◽  
Author(s):  
Bret C. Harvey
Keyword(s):  
Multivariate Analysis ◽  
Analysis Of Variance ◽  
Herbivorous Insect ◽  
Direct Effects ◽  
Multivariate Analysis Of Variance ◽  
Benthic Assemblages ◽  
High Gradient ◽  
Invertebrate Predators ◽  
Significant Difference ◽  
Northern Utah

In a series of high-gradient streams along the Wasatch Front in northern Utah, perlid stoneflies were more abundant in benthic samples from 14 fishless streams than in 9 similar streams which contained trout. Smaller-bodied perlodid stoneflies were more abundant in samples from streams containing trout. Herbivorous insect abundances varied substantially within groups of streams containing and lacking trout; multivariate analysis of variance using the six most abundant herbivorous taxa indicated no significant difference between the two groups of streams. Similarly, total numbers of invertebrates did not differ between streams with and without fish. Sites above and below the upstream limit of trout in three streams showed patterns in invertebrate abundances similar to that seen at the whole-stream scale. Trout may have no effect on the overall density of stream benthos because of their negative direct effects on invertebrate predators.

Investigation of Force Required to Crack Melon Seed Shell by Static Loading

2007 ◽  
Vol 18-19 ◽  
pp. 187-192
Author(s):  
F.B. Okokon ◽  
Mathew A. Oduh ◽  
N.A. Akpan
Keyword(s):  
Moisture Content ◽  
Analysis Of Variance ◽  
Static Loading ◽  
Melon Seed ◽  
Level Of Confidence ◽  
Significant Difference ◽  
The Mean ◽  
Melon Seeds ◽  
Experimental Rig

The force required to shell melon seed by static loading techniques was investigated with an experimental rig machine. Melon seeds were categorized based on their moisture content into 4 sub-samples by soaking. Ten seeds from each sample were randomly selected and loaded in three different loading orientations x, y and z. The mean force required to crack the seeds was determined. Results showed variations in force, while analysis of variance showed significant difference in the loading orientation and no significant difference in the interaction of moisture content, at 95% level of confidence.

Sensory Treatment for the Reduction of Stereotypic Behaviors in Persons with Severe Multiple Disabilities

1989 ◽  
Vol 9 (3) ◽  
pp. 170-183 ◽  
Author(s):  
Kiyotaka Iwasaki ◽  
Margo B. Holm
Keyword(s):  
Multivariate Analysis ◽  
Analysis Of Variance ◽  
Multiple Disabilities ◽  
Stereotypic Behavior ◽  
Treatment Intervention ◽  
Intervention Period ◽  
Control Groups ◽  
Multisensory Stimulation ◽  
Significant Difference ◽  
And Control

The purpose of this study was to compare the effectiveness of excitatory and inhibitory multisensory stimulation for reducing instances of stereotypic behavior (STB) in a severely multiply disabled population. Thirty-six subjects were randomly assigned to three groups (excitatory stimulation, inhibitory stimulation, and control groups), and the two experimental groups received a treatment intervention for 30 days. The multisensory stimulation consisted of vestibular, tactile, auditory, and visual input designed to be either excitatory or inhibitory. STB was measured before, after, and 2 months after the intervention period. A multivariate analysis of variance (MANOVA) indicated that there was a statistically significant difference between tests, but not between groups. Propositions are set forth and examined for factors that could have influenced the results.

Morphometric analysis of some populations of lymnocardiid species (Mollusca: Bivalvia) from Razelm Lake Complex (Romania)

2010 ◽  
Vol 53 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Oana Popa ◽  
Elena Iorgu ◽  
Beatrice Kelemen ◽  
Dumitru Murariu ◽  
Luis Popa
Keyword(s):  
Multivariate Analysis ◽  
Discriminant Analysis ◽  
Analysis Of Variance ◽  
Morphometric Analysis ◽  
Growth Pattern ◽  
Curve Analysis ◽  
Multivariate Analysis Of Variance ◽  
Geographical Variability ◽  
Significant Difference ◽  
Morphological Variables

Morphometric analysis of some populations of lymnocardiid species (Mollusca: Bivalvia) from Razelm Lake Complex (Romania) In this paper we report the morphometric analysis of some populations of Lymnocardiid species from the lakes Razelm and Goloviţa. We used three measurements ratios to perform a discriminant analysis and a multivariate analysis of variance (MANOVA), in order to compare the species Hypanis colorata vs. Hypanis angusticostata in the two lakes, H. colorata in Razelm vs. Goloviţa, and H. angusticostata in Razelm vs. Goloviţa. From this analysis we concluded that the multivariate means of the morphological variables used in this study were highly significantly different (p=3.2e-05) between the two species. Concerning the geographical variability, in both species, the analysis showed no significant difference between the populations in the two investigated lakes. We also determined from a fitting curve analysis, that the growth pattern of both species shows length-height isometry and width-length and width-height negative allometry.

Effects of Supervisors' Age, Sex, Number of Subordinates, and Tenure on Disciplinary Intentions

1987 ◽  
Vol 60 (1) ◽  
pp. 287-294
Author(s):  
Edward Ward
Keyword(s):  
Multivariate Analysis ◽  
Sex Differences ◽  
Literature Review ◽  
Analysis Of Variance ◽  
Perceived Stress ◽  
Work Force ◽  
Control Technique ◽  
Multivariate Analysis Of Variance ◽  
Work Settings ◽  
Significant Difference

A literature review indicated little research on punishment in work settings despite the prevalence of punishment as a control technique. In the current study, 45 female supervisors and 36 male supervisors rated a list of 40 job-related behaviors as to the intensity of discipline they would administer to a subordinate who did any of the job-related behaviors. A multivariate analysis of variance of the ratings indicated no significant difference associated with sex of the rater as to the intensity of the discipline they would administer. Nonsignificant correlations were noted on disciplinary intentions with increasing age, tenure, and number of subordinates. These findings, along with other studies of sex differences in the work force, indicate such study of sex differences may need to be limited to a narrow field in which sex differences have been reported, such as perceived stress.

scholarly journals Comparing Family Drawing Test Indices and Behavioral Problems between Iranian and Afghan Emigrant Children, Isfahan Province, Iran

2020 ◽  
Vol 14 (2) ◽  
Author(s):  
Mohamad Davari ◽  
Sayed Abbas Haghayegh
Keyword(s):  
Multivariate Analysis ◽  
Analysis Of Variance ◽  
Behavioral Problems ◽  
Behavioral Problem ◽  
Multivariate Analysis Of Variance ◽  
Chi Square ◽  
Isfahan Province ◽  
Drawing Test ◽  
Significant Difference ◽  
Iranian Students

Background: Immigration can be accompanied by many psychological outcomes for emigrant families. Objectives: The present study aimed to compare family drawing test indices and behavioral problems among Iranian and Afghan emigrant children. Methods: The research design was a comparative and cross-sectional study. We included 550 Iranian and Afghan students aged 7 - 11 years in Isfahan Province from April to June 2017. Achenbach Behavioral Problem questionnaire (2001) was sent to their mothers for filling, and Drawing Family Test was conducted. After reducing the number of dropout students, the final sample reached 282 students (including 174 Iranian students and 108 Afghan immigrants)., SPSS-23 software and chi-square tests as well as multivariate analysis of variance were used for analyzing data. Results: The results of the chi-square test showed that there was a significant difference in some of the drawing indices, including size, rhythm, location of drawing, valuation, removal of person, and distances between two groups of Iranian students and Afghan migrants (P < 0.05). Also, the results of multivariate analysis of variance indicated that there was a significant difference among mean scores of behavioral problems and dimensions of somatization, thinking problems and anti-social problems in the two groups (P < 0.05). There was no significant difference in other variables. Conclusions: According to the results, the children of the Afghan refugee group have more both behavioral problems and drawing indices than the Iranian group.

scholarly journals Investigation of the Relationship between Free Time Management, Social Media Addiction and Life Satisfaction of University Students During the COVID-19 Pandemic Process

2021 ◽  
Vol 7 (3) ◽  
pp. 85
Author(s):  
Recep Cengiz ◽  
Batuhan Er
Keyword(s):  
Social Media ◽  
Life Satisfaction ◽  
Multivariate Analysis ◽  
University Students ◽  
Analysis Of Variance ◽  
Time Management ◽  
Free Time ◽  
Social Media Addiction ◽  
Significant Difference ◽  
The Relationship

The aim of this study is to examine the relationship between university students free time management, social media addiction and life satisfaction during the COVID-19 pandemic.The sample group of the study consists of 114 female and 291 male university students. Free Time Management Scale, Social Media Addiction Scale and Life Satisfaction Scale were used as data collection instruments in the research. SPSS 25 package program was used in the analysis of the data; In their statistical representations, arithmetic mean, standard deviation and frequency values are presented. For analysis to the data set; T-Test for Independent Samples, Multivariate Analysis of Variance (MANOVA), One Way Analysis of Variance (ANOVA) and Pearson Correlation Test were applied.When the T-Test results for Independent Samples are examined; In terms of gender variable, a significant difference was found in favor of women in the “goal setting and method” sub-dimension of the Free Time Management Scale. When the results of Multivariate Analysis of Variance MANOVA test were examined; In terms of daily social media usage times, a significant difference was found in the sub-dimensions of preoccupation, mood regulation, repetition and conflict of the Social Media Addiction Scale.As a result, it is seen that there is a relationship between university student participants’ free time management and social media addiction. However, no relationship was found between life satisfaction and social media addiction. While a low negative correlation was found between the total score of life satisfaction and the free time management programming sub-dimension, no correlation was found between the sub-dimensions of goal determination and method, assessment and free time attitude.

Sign in / Sign up

Export Citation Format

Share Document