• Title, Summary, Keyword: Effect size

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A Meta-Analysis of the Effects of Multi-Cultural Education Program in Korea (다문화가정과 일반가정 유아와 아동을 대상으로 한 다문화교육 프로그램의 효과에 관한 메타분석)

  • Choi, Hea Young
    • Korean Family Resource Management Association
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    • v.19 no.3
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    • pp.1-16
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    • 2015
  • The purpose of this study was to synthesize the results of studies on the effects of multi-cultural education program for Korean children. Using the author's own selection criteria, 17 studies were finally selected and 31 effect sizes were calculated from these studies and used for meta analysis. The overall effect size for all studies on the random effect model was .802, and it was positive and high. Given the heterogeneity among the effect size, subgroup analysis was conducted. According to the analysis, effect sizes significantly differed depending on program goal, concerned multi-cultural higher than others. Result also showed that the high scored effect sizes were the general family, pre-school age children group, and the program were 11-20 children group in size, and 11~20 times in frequency of education.

Size Effect of Compressive Strength of Concrete for the Cylindrical Specimens Considering Strength Level (강도수준을 고려한 원주형 공시체에 대한 콘크리트 압축강도의 크기효과)

  • Kim, Hee-Sung;Jin, Chi-Sub;Eo, Seok-Hong
    • Magazine of the Korea Concrete Institute
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    • v.11 no.2
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    • pp.95-103
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    • 1999
  • The reduction phenomena of concrete compressive strength with the size of specimens have been extensively investigated, but till now the adequate analysis technique is not fixed. The existing research results show that the bigger the member size, the smaller the strength. This means the nonlinear fracture mechanics theory is needed in order to analyze the fracture behaviors of concrete and the size effect. There is a few model equations that is to predict the size effect of compressive strength of standard and non-standard cylindrical specimen. However, theses equations did not considered the difference of fracturing mechanism which depends on the strength level. In this paper, model equations to predict compressive strength of concrete considering the size effect and strength level are suggested. The size effect model suggested in this paper shows good prediction compared with the existing test data of various concrete size and strength level.

A Meta-analysis of Effectiveness of Kigong Programs for the Physical Health of the Elderly (노인 신체건강을 위한 기공(氣功)프로그램 효과성 메타분석)

  • Kim, Ilsik;Kim, Gyeryung;Lee, Su-kyung;Seo, Hochan
    • 한국노년학
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    • v.38 no.1
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    • pp.65-82
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    • 2018
  • The purpose of this study is to statistically summarize the effect sizes using meta-analysis of various Kigong programs implemented on the subject of physical health of the elderly. Including 23 academic journal studies and 11 thesis studies reported domestically until 2016, a total of 34 studies were selected and analyzed to verify the effect sizes of programs, program types, measuring variables, and activity elements. The findings are as follows. First, it was found that the programs were midium effective with overall average effect size showing .748(p<.001). A program of Tai-Chi indicated the largest effect size of .836(p<.001). In terms of measuring variables, physical strength showed the largest effect size of .806(p<.001). In terms of gender by group, it was found that groups consisting only of men indicated the largest effect size of 2.388(p<.001). As for effect size by group of disease state, normal group with showed the highest effect size of .804(p<.001). Second, in activity elements, 31~60 by the group size has the largest effect size of .873(p<.001), total number of sessions for 31~40 sessions indicated the largest effect value of .829(p<.001). As for number of sessions per week, 5 sessions showed largest effect value of .918(p<.001), in terms of activity time, 50 minutes showed large effect value of 1.391(p<.001). As summarized above, Kigong programs are midium effective for physical health of the elderly, as an activity elements to consider when configuring the program, for group size 31~60, 31~40 sessions in total, 5 sessions per week and 50 minutes per sessions were recommended.

A STATISTICAL STUDY ON THE EFFECT OF TOOTH SIZE AND DENTAL ARCH SIZE UPON THE CROWDING (치아와 악골의 크기가 밀집에 미치는 영향에 관한 통계학적 연구)

  • Ahn, Byoung-keun
    • The korean journal of orthodontics
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    • v.20 no.2
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    • pp.217-226
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    • 1990
  • The purposes of this study were to clarify the effect of tooth size and arch size upon the crowding. 175 upper casts were measured and following conclusions were made. 1. Tooth size, intermolar width, 2nd premolar width of crowded group were not significantly different from those of noncrowded groups. 2. Intercanine width, arch length of noncrowded group were significantly larger than crowded group. 3. Multiple regression equations were derived by using tooth size, arch perimeter, arch length, intermolar width.

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A meta-analysis of effectiveness of death education program (죽음준비교육 프로그램 효과성에 대한 메타분석)

  • Kim, Ilsik;Kim, Gyeryung;Shin, Hyesook;Seo, Hochan
    • 한국가족관계학회지
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    • v.21 no.2
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    • pp.3-23
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    • 2016
  • Objectives: The purpose of this study is to conduct a meta-analysis of results of death education program implemented with a wide range of learners from preschoolers to the elderly and use the findings to suggest effect sizes of the intervention program, variables, and measurement tools and activity elements of the variables. Method: Among preceding studies conducted domestically until 2015, 21 studies that meet the meta-analysis criteria were selected and analyzed using CMA(Comprehensive Meta-Analysis 3.0 version). Results: The findings are as follows. The overall average effect size was rather large at 0.997. Reviewing by research subject group, victims of domestic violence indicated the largest effect size(2.381). As for variables, death awareness showed the largest effect size(2.908). In terms of activity elements, the largest effect size for total number of sessions was 16 sessions (4.972), while that for per week sessions was 2 sessions/week (2.327). With effect size for activity hours largest at 30 minutes(5.365) followed by 108 minutes(2.381) and 360 minutes(1.607), it was found that there is no positive relationship between activity time and effect size. In terms of publication type, effect size of academic journal paper was 1.107 while that of thesis or dissertation was 0.894, indicating that academic journal papers are relatively highly effective. Conclusions: The present study is meaningful in that it provides baseline data applicable to program development and implementation by verifying the effectiveness of domestically implemented death education programs and variables relevant to such programs.

Meta-Analysis of the Effects of Nutrition & Dietary Life Education for Preschoolers (미취학아동 대상 영양·식생활교육의 효과 메타분석)

  • Kim, Song Hee;Kim, Ae Jung
    • Journal of the Korean Dietetic Association
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    • v.26 no.2
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    • pp.153-173
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    • 2020
  • The purpose of this study was to objectively quantify the effects of nutrition and dietary life education on preschoolers through meta-analysis. In addition, it provides basic data for the implementation of nutrition education and development of systematic nutrition and dietary life education programs. In this study, a meta-analysis of 27 papers was conducted that conformed to the selection criteria in the study conducted from January 2012 to August 2019 to derive objective data on the effects of education. As a result of the analysis, the overall effective size of nutrition and dietary life education for preschoolers was 0.829, which indicates a strong effect. According to the education method, the effect size of general education was 0.562, which indicates a medium effect size, the vegetable playing-based experience education was 0.685, which indicates a medium effect size, and cooking activity-based experience education was 1.101, which indicates a large effect size. Judging from this result, experience activity education was more effective than general nutrition education. In addition, the combined size of convergence education conducted through a combination of general and experience education was found to be the most effective at 1.301. In terms of educational effect, it was confirmed that the effect size was 0.898 for improving nutrition knowledge, 0.858 for improving dietary habits, 0.836 for improving unbalanced diet, and 0.756 for improving food preference and intake, and the sizes of effects were all found to be large. As frequency of education increased, the number of education participants decreased and the effect of education increased.

The Size Effect in Particulate Composite Materials - Size - Dependent Plasticity (입자보강 복합재료에서 크기효과 -Size-Dependent 소성역학)

  • Kim S. H.;Huh H.;Hahn H. Thomas
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.167-170
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    • 2005
  • This paper briefly reviews various existing methods to account for the effect of particle size on mechanical properties of particulate metal matrix composites. A simple and easy method is to use a size-dependent constitutive equation for the matrix. The suggested method does not require the development of a new computational algorithm and is compatible with any standard finite element software. Finite element analyses have been carried out to show how the deformation behavior of a metal matrix composite changes as the particle size and volume fraction are varied.

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Sample Size Calculation for Cluster Randomized Trials (임상시험의 표본크기 계산)

  • Pak, Son-Il;Oh, Tae-Ho
    • Journal of Veterinary Clinics
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    • v.31 no.4
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    • pp.288-292
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    • 2014
  • A critical assumption of the standard sample size calculation is that the response (outcome) for an individual patient is completely independent to that for any other patient. However, this assumption no longer holds when there is a lack of statistical independence across subjects seen in cluster randomized designs. In this setting, patients within a cluster are more likely to respond in a similar manner; patient outcomes may correlate strongly within clusters. Thus, direct use of standard sample size formulae for cluster design, ignoring the clustering effect, may result in sample size that are too small, resulting in a study that is under-powered for detecting the desired level of difference between groups. This paper revisit worked examples for sample size calculation provided in a previous paper using nomogram to easy to access. Then we present the concept of cluster design illustrated with worked examples, and introduce design effect that is a factor to inflate the standard sample size estimates.

The Syllable Frequency Effect in Semantic Categorization Tasks in Korean

  • Kim, Ji-Hye;Kwon, You-An;Nam, Ki-Chun
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.5 no.10
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    • pp.1879-1890
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    • 2011
  • Previous studies of syllable frequency effects have proposed that inhibitory effects due to high first syllable frequency were the products of competitions between activated lexical candidates within a lexical level. However, these studies have primarily used lexical decision tasks to examine the nature of syllable frequency effects. This study investigates whether a syllable frequency effect can arise in semantic categorization tasks and whether phonologically or orthographically defined syllables interact with semantically related variables such as morphological family size. If the syllable frequency effect was created by activations and competitions on a lexical level, it is highly possible that the effect was related to semantic categorization tasks. To test this hypothesis, we conducted two experiments. In Experiment 1, morphological family size and phonological syllable frequency were factorially manipulated. In Experiment 2, morphological family size and orthographic syllable frequency were factorially manipulated. The results demonstrate that morphemes have no relationship with phonological syllables but do with orthographic syllables. This suggests that phonological syllables and orthographic syllables have different roles in the syllable frequency effect on visual word recognition process.

Effect of aquatic exercise on gait in persons with chronic stroke: a meta-analysis study in Korea

  • Lee, Dong-Jin;Cho, Sung-Hyoun
    • Physical Therapy Rehabilitation Science
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    • v.8 no.2
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    • pp.112-123
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    • 2019
  • Objective: Based on the results of previous studies, it is necessary to analyze gait and discuss and present the effects of aquatic exercise for chronic stroke. The purpose of this study was to present objective data on the effect of aquatic exercise on the gait of persons with stroke by performing a meta-analysis. Design: A systematic review and meta-analysis. Methods: We performed a meta-analysis of 23 studies that investigated the effects of aquatic exercise performed between 2006 and 2017. The studies were searched on the basis of the participants, intervention, comparison, outcomes standard. The quality of the research method was assessed using a tool that can assess the risks posed by each study design. A meta-analysis software program was used to calculate the mean effect size, effect size by intervention, and effect size by outcome. We also performed a meta-regression analysis and an analysis of publication bias. Results: The mean effect size of the patients' gait was 0.65 (p<0.05). The largest effect size by outcome was observed at the 6-m walk test, followed by the 6-minutes walk test, 10-m walk test, and the walking equipment test (p<0.05). The meta-regression analysis showed that the effect size increased with increased duration, number, and length of sessions. Conclusions: Aquatic exercise appears to show a moderate effect on the gait of chronic stroke survivors. Meta-analyses on the effects of aquatic exercise in other patient populations are needed. This study suggests standard criteria establishments for the effect of aquatic exercise on the walking ability of persons with chronic stroke.