On the statistical analysis of niche overlap data

1990 ◽  
Vol 68 (7) ◽  
pp. 1420-1422 ◽  
Author(s):  
Bryan F. J. Manly
Keyword(s):  
Statistical Analysis ◽  
Analysis Of Variance ◽  
Niche Overlap ◽  
Temporal Changes ◽  
Significance Level ◽  
Random Pairing ◽  
Two Populations

It has recently been suggested that problems with the statistical analysis of niche overlap data can be overcome by computing overlaps between randomly paired individuals. This allows a test for temporal changes in the overlap between two populations. In this paper, it is suggested that this test relies too heavily on random pairing. It is argued that a better test is one based on an analysis of variance of niche overlaps between all possible pairings that can be made at the same time, with the significance level being determined by bootstrapping.

scholarly journals Assessment of changes in smile after rapid maxillary expansion

2012 ◽  
Vol 17 (5) ◽  
pp. 94-101 ◽  
Author(s):  
Ana Paula Morales Cobra de Carvalho ◽  
Fernanda Cavicchioli Goldenberg ◽  
Fernanda Angelieri ◽  
Danilo Furquim Siqueira ◽  
Silvana Bommarito ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Analysis Of Variance ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Lower Lip ◽  
Significance Level ◽  
Maxillary Incisors ◽  
Maxillary Constriction ◽  
Smile Esthetics

INTRODUCTION: This study evaluated changes in the smile characteristics of patients with maxillary constriction submitted to rapid maxillary expansion (RME). METHODS: The sample consisted of 81 extraoral photographs of maximum smile of 27 patients with mean age of 10 years, before expansion and 3 and 6 months after fixation of the expanding screw. The photographs were analyzed on the software Cef X 2001, with achievement of the following measurements: Transverse smile area, buccal corridors, exposure of maxillary incisors, gingival exposure of maxillary incisors, smile height, upper and lower lip thickness, smile symmetry and smile arch. Statistical analysis was performed by analysis of variance (ANOVA), at a significance level of 5%. RESULTS: RME promoted statistically significant increase in the transverse smile dimension and exposure of maxillary central and lateral incisors; maintenance of right and left side smile symmetry and of the lack of parallelism between the curvature of the maxillary incisal edges and lower lip border. CONCLUSIONS: RME was beneficial for the smile esthetics with the increase of the transverse smile dimension and exposure of maxillary central and lateral incisors.

Genetics of cone morphology in white spruce (Picea glauca)

1974 ◽  
Vol 52 (1) ◽  
pp. 15-21 ◽  
Author(s):  
M. A. K. Khalil
Keyword(s):  
Statistical Analysis ◽  
Genetic Control ◽  
Analysis Of Variance ◽  
Picea Glauca ◽  
White Spruce ◽  
Hierarchical Analysis ◽  
Analysis Techniques ◽  
Cone Morphology ◽  
Student’S T ◽  
Two Populations

A study was conducted in 1971 to estimate the degree of genetic control on the characters of cone morphology of white spruce (Picea glauca (Moench) Voss) from two areas of central Newfoundland and to determine whether these characters were associated with phenotypic superiority in growth. Hierarchical sampling was done, selecting two locations, two populations at each location, five trees in each population, and 20 cones from each tree. Ten characters were studied. Statistical analysis techniques used were calculation of repeatability as an estimate of heritability, hierarchical analysis of variance, and comparison of the populations of "ordinary" and "plus" trees, using Student's ‘t’ and Snedecor's 'F' tests.The results indicate that most of the 10 characters studied are under strong genetic control but these characters are not associated with phenotypic superiority in growth.

scholarly journals Color Change of Different Dual-Cure Resin Cements After Thermocycling

2019 ◽  
Vol 21 (2) ◽  
pp. 53-62
Author(s):  
Ayşe Atay DDS, PhD ◽  
Zülal Palazli DDS ◽  
Işıl Gürdal DDS ◽  
Aslıhan Üşümez DDS, PhD
Keyword(s):  
Statistical Analysis ◽  
Analysis Of Variance ◽  
Color Change ◽  
Data Distribution ◽  
The Other ◽  
Multiple Comparison ◽  
Resin Cements ◽  
Significance Level ◽  
Kolmogorov Smirnov ◽  
Smirnov Test

The purpose of this study is to evaluate the effect of thermocycling on the color change of the amine-free dual-cure resin cements. IPS e.max CAD blocs were cut into specimens of 1 mm thickness (N=28) and cemented with one of the 4 different amine-free dual-cure resin cements (NX3 Nexus [NX], Kerr Dental; Variolink Esthetic DC [VE], Ivoclar Vivadent; Panavia V5 [PV], Kuraray Dental; G-CEM Linkforce [GC], GC Corporation) (n=7). A spectrophotometer was used for color measurements. Specimens were subjected to thermocycling (5°C and 55°C; 5000 and 10000 cycles). Normality of data distribution was tested by using the Kolmogorov-Smirnov test. Statistical analysis was performed using a two-way analysis of variance (ANOVA) and Tukey’s multiple comparison tests at a significance level of p<0.05. ∆E values were significantly influenced by the resin cements and the cycle periods (p<0.05). There were no significant differences between NX and VE groups after 5000 thermocycling, however after 10000 thermocycling VE group showed higher ∆E1 values than NX group (p>0.05).  There were no statistically significant differences between the ∆E0 and ∆E1 values of the GC group, however the other groups were affected after 10000 thermocycling (p>0.05). Amine-free resin cements used for cementation showed color change after thermocycling except GC group. All resin cements were showed clinically acceptable color change after thermocycling (∆E < 3.5).

scholarly journals Characteristics of anteroposterior curvatures of the spine in soccer and futsal players

2017 ◽  
Vol 18 (4) ◽  
Author(s):  
Krystyna Chromik ◽  
Anna Burdukiewicz ◽  
Jadwiga Pietraszewska ◽  
Aleksandra Stachoń ◽  
Paweł Wolański ◽  
...  
Keyword(s):  
College Students ◽  
Statistical Analysis ◽  
Injury Prevention ◽  
Analysis Of Variance ◽  
Statistical Significance ◽  
Body Posture ◽  
Soccer Players ◽  
Prevention Training ◽  
The Difference ◽  
Post Hoc

AbstractPurpose. The aim of the study was to determine differences in anteroposterior spine curvatures between futsal players, soccer players, and non-training students. The results may contribute to the development of present-day knowledge of posturometry, and its implementation in training can help reduce the risk of body posture disorders in athletes. Methods. The examined group consisted of 48 athletes and 38 non-training college students. Body posture parameters were measured with the use of Posturometr-S. The normality of distribution was checked with the Shapiro-Wilk test, and the differences between the groups were measured with ANOVA and the Bonferroni post-hoc test. The level of statistical significance was set at p < 0.05. Results. The analysis of angle values revealed the widest and most similar measurements in the group of futsal players and soccer players. The analysis of variance proved statistically significant differences between the soccer players and futsal players (p = 0.003). The difference between the soccer players and non-training students was statistically significant. The highest γ angular value was measured in non-training students, followed by futsal players and soccer players. The statistical analysis revealed significant differences between the non-training students and futsal players, as well as non-training students and soccer players (p < 0.001). Conclusions. A complex assessment of athletes’ body posture is crucial in injury prevention. Training overloads may often lead to disorders of the organ of locomotion and affect the correct body posture in athletes. This, in turn, may result in pains and injuries.

Statistical analyses of the physiochemical properties of derived savanna, rainforest landscapes of Delta State Nigeria

2021 ◽  
Vol 1 (2) ◽  
pp. 053-067
Author(s):  
Apezi Okiemute EDEWOR ◽  
Augustus Orowhigo ATUBI
Keyword(s):  
Statistical Analysis ◽  
Soil Fertility ◽  
Physiochemical Properties ◽  
Significance Level ◽  
Fertility Index ◽  
Physiochemical Parameters ◽  
Soil Constituent ◽  
Derived Savanna ◽  
Soil Fertility Index ◽  
The One

The derived savanna landscape of Delta state situated within the rainforest region are always considered with apathy as they are viewed as idle, marginalized or abandoned landscapes. The study therefore focused on statistical analysis of the physiochemical properties of the derived savanna, rainforest and fallow landscapes of Delta state. The statistical analysis gave impetus for the derivation of Soil Fertility Index (SFI). The hypothesis formulated to guide the study was tested using the one-way Analysis of Variance (ANOVA). This was used to test the variation between soil physiochemical parameters of the various landscapes at 0.05 significance level. Specifically, the study found out that the physiochemical parameters of the landscapes studied are significantly correlated. Thus, implying basic similarities in soil fertility and soil constituent tendencies between the landscapes.

scholarly journals EFFECTS OF BELT SPEED, PRESSURE AND GRIT SIZE ON THE SANDING OF Pinus elliottii WOOD

CERNE ◽  
2015 ◽  
Vol 21 (1) ◽  
pp. 45-50 ◽  
Author(s):  
Manoel Cléber de Sampaio Alves ◽  
Luiz Fernando Frezzatti Santiago ◽  
Marcos Tadeu Tiburcio Gonçalves ◽  
Ivaldo De Domênico Valarelli ◽  
Francisco Mateus Faria de Almeida Varasquim
Keyword(s):  
Surface Roughness ◽  
Analysis Of Variance ◽  
Block Design ◽  
Pinus Elliottii ◽  
Grit Size ◽  
Significance Level ◽  
Belt Speed ◽  
Randomized Complete Block Design ◽  
Four Levels ◽  
Temperature Levels

The present paper aims to evaluate the influence of the factors (belt speed, pressure and grit size) on the output parameters (temperature and surface roughness) for Pinus elliottii wood sanding, processed parallel to the fibers. Three levels of belt speed, three levels of pressure and four levels of grit size were employed, with six replicates for each process, totaling 216 observations. The experiment conducted under a randomized complete block design (RCBD). The results were analyzed employing the analysis of variance (ANOVA) with 5% of significance level. Only grit sizes were significant to different temperature levels. The same outcome was observed for roughness, where only grits sizes were significant. No interaction between the pressure and belt speed factors were observed for all the results analyzed.

scholarly journals Fuel and lubricant consumption in felling the young oak-hornbeam stands

2002 ◽  
pp. 59-66
Author(s):  
Vojislav Bajic ◽  
Milorad Danilovic
Keyword(s):  
Statistical Analysis ◽  
Analysis Of Variance ◽  
Unit Area ◽  
Function Form ◽  
Tree Diameter ◽  
Significant Difference ◽  
The Difference ◽  
Level Of Significance ◽  
Average Consumption

Based on the elements of statistical analysis on the dependence of fuel and lubricant consumption on tree diameter, it was assessed that with the increase of tree diameter, the fuel and lubricant consumption in the young oak and hornbeam stands decreases significantly, both in clear felling and in thinning and that the function form Y=exp(a+b x X?1) is the best description of the correlation The consumption of fuel compared to lubricant consumption is almost double, which agrees with the results of the previous studies. Average consumption of fuel and lubricant is 17.43 mL x tree?1, on the plots 20.27 mL x tree?1, average consumption of lubricant per tree on skid roads is 9.4 mL x tree?1, on the plots 11 mL x tree?1. The higher consumption of fuel and lubricant on the plots with selective thinning is the consequence of the longer time needed for the conversion per tree, compared to that in clear felling The consumption of fuel per unit area on the skid roads (clear felling) is 22.9 L x ha?1, on the plots (selective thinning) 7.6 L x ha?1. The consumption of lubricant on the skid roads is 13.3 L x ha?1, on the plots 4.29 L x ha?1. The higher consumption of fuel and lubricant per unit area on the skid roads is due to the difference in the number of trees per unit area Based on the results of the analysis of variance, it was found out that between fuel and lubricant consumption in selective thinning and in felling the trees along tractor skid roads there is no statistically significant difference at the level of significance of 95%. So, for practical purposes, the unique norms of consumption can be established for the stands similar to those in which the study was performed.

scholarly journals PENGARUH KONSENTRASI STARTER BAKTERI Lactobacillus plantarum TERHADAP BEBERAPA KOMPONEN MUTU TEPUNG PORANG (Amorphophallus oncophyllus)

Pro Food ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 673
Author(s):  
Ade Irma Juliana ◽  
Moegiratul Amaro ◽  
Nazaruddin Nazaruddin
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Protein Content ◽  
Lactobacillus Plantarum ◽  
Analysis Of Variance ◽  
Ph Value ◽  
Significance Level ◽  
Randomized Design ◽  
Significant Difference ◽  
Polynomial Orthogonal

ABSTRACT               This study aims to determine the effect of Lactobacillus plantarum bacterial starter concentration on some quality of the porang flour. This study used experimental design one-factor Completely Randomized Design (CRD) consisted of BAL concentration (KB) of Lactobacillus plantarum with 6 treatments which is 0%, 5%, 10%, 15%, 20% and 25%. Each of treatment were repeated three times to obtain 18 unit samples. Data from observations were analyzed using analysis of variance (Analysis of Variance) at 5% significance level using Co-stat software. If there are significant differences, a further Polynomial Orthogonal and Honestly Significant Difference (BNJ) test is performed at a level of 5%. The parameters observed included pH value, protein content, water content, yield, total lactic acid bacteria, organoleptic parameters of color and aroma (hedonic and scoring). The results showed that the concentration of Lactobacillus plantarum bacterial 20% was the best treatment in producing porang flour, pH value 5.72, protein content 6.49%, yield 9.33%, total lactic acid bacteria 6.66 log CFU / g and color rather brown and slightly acidic aroma and somewhat preferred by panelists. Keywords: Porang flour, starter concentration, Lactobacillus plantarum   ABSTRAK             Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi starter bakteri Lactobacillus plantarum terhadap beberapa komponen mutu tepung porang. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan satu faktor yakni konsentrasi BAL (KB) jenis Lactobacillus plantarum dengan 6 perlakuan yaitu 0%, 5%, 10%, 15%, 20% dan 25%. Masing-masing perlakuan diulang sebanyak 3 kali sehingga diperoleh 18 unit percobaan. Data hasil pengamatan dianalisis menggunakan analisis keragaman (Analysis of Variance) pada taraf nyata 5% menggunakan software Co-stat. Apabila terdaapat beda nyata, dilakukan uji lanjut Polynomial Orthogonal dan Beda Nyata Jujur (BNJ) pada taraf 5%. Adapun parameter yang diamati meliputi nilai pH, kadar protein, kadar air, rendemen, total bakteri asam laktat, parameter organoleptik warna dan aroma (hedonik dan scoring). Hasil penelitian menunjukkan bahwa konsentrasi strater bakteri Lactobacillus plantarum 20% merupakan perlakuan terbaik dalam menghasilkan tepung porang nilai pH 5,72, kadar protein 6,49%, rendemen 9,33%, total bakteri asam laktat 6,66 log CFU/g serta warna agak coklat dan aroma agak asam serta agak disukai panelis.    Kata Kunci: Tepung porang, konsentrasi starter, Lactobacillus plantarum

scholarly journals Pengaruh Kegiatan Jam’iyatul Qurra’ Wal Huffadz (JQH) terhadap Perilaku Keberagamaan

2015 ◽  
Vol 7 (1) ◽  
pp. 89
Author(s):  
Fuji Sugeharti
Keyword(s):  
Statistical Analysis ◽  
Religious Behavior ◽  
Significance Level ◽  
Student Activity ◽  
The Arts

Keaktifan mengikuti organisasi merupakan intensitas mengikuti kegiatan yang diadakan sebuah organisasi. Organisasi JQH adalah salah satu unit kegiatan mahasiswa yang bergerak di bidang baca tulis dan hafalan al-Qur’an. Mahasiswa STAIN Salatiga umumnya menganggap JQH didirikan bagi mereka yang berbakat di bidang seni, baca tulis dan hafalan al-Qur’an saja, sehingga JQH seringkali dipandang memiliki strata tertinggi dibandingkan dengan UKM dan Lembaga Khusus lainnya. Padahal banyak kegiatan yang dilakukan JQH dapat meningkatkan religiusitas mahasiswa. Penelitian ini mencoba mengkaji seberapa besar intensitas mengikuti kegiatan-kegiatan yang diadakan organisasi dalam hal ini keaktifan mahasiswa mengikuti organisasi JQH dengan perilaku keberagamaan mahasiswa. Pengumpulan data diperoleh dengan menggunakan instrumen angket, observasi dan dokumentasi. Setelah dilakukan penelitian secara sistematik di lokasi penelitian dapat diketahui bahwa ada hubungan yang signifikan antara keaktifan mengikuti organisasi JQH dengan sikap keberagamaan mahasiswa PAI STAIN Salatiga angkatan tahun 2010 dan 2011 terlihat dari hasil analisis statistik bahwa rxy hitung (0,607) > rxy tabel (0,361) pada taraf signifikansi 5% dengan N= 30. Being active in organization is following the intensity of the activities held in an organization. Jami’yatul Qurro’ wal Huffadz (JQH) is one unit of student activity engaged in reading - writing and recitation of the Qur'an. Students generally consider JQH STAIN Salatiga established for those who are gifted in the arts, literacy and memorization of the Qur'an only, so JQH often seen as having the highest strata compared with another students activities. Though many of the activities carried out by JQH can improve student religiosity. This study tried to assess how much the intensity in following the activities held in this organization, i.e. active students, attend JQH organizations with religious behavior of students. The data obtained using questionnaires, observation and documentation. After doing research in a systematic on-site research is that there is a significant correlation between follows the organization activity of JQH with the attitude of Islamic religious (PAI) students of STAIN Salatiga in 2010 and 2011. It is shown by the results from the statistical analysis that rxy arithmetic (0.607) > r xy table (0.361) on significance level of 5% with N = 30. Kata Kunci: organisasi, keberagamaan, JQH

scholarly journals Keefektifan Media Scrapbook Melalui Model Student Teams Achievement Division Terhadap Motivasi Dan Hasil Belajar IPS

2018 ◽  
Vol 2 (4) ◽  
pp. 373
Author(s):  
Nita Puspitasari ◽  
Iin Purnamasari ◽  
Henry Januar Saputra
Keyword(s):  
Statistical Analysis ◽  
Learning Outcomes ◽  
T Test ◽  
Learning Motivation ◽  
Control Group ◽  
Control Group Design ◽  
Significance Level ◽  
Student Teams ◽  
Motivation And Learning ◽  
Division Model

This study aims to determine the effectiveness of the Scrapbook Media through the Model of Student Teams Achievement Division on the Motivation and Learning Outcomes of Students in Class III of SDN Mranggen 2. The design of this study uses True Experimental Designs Pretest-Posttest Control Group Design. To analyze student learning motivation using test analysis data of observation motivation learning . The population in this study were all students of class IIIA and IIIB SD Negeri Mranggen 2. t can be concluded that there is effectiveness of scrapbook media through the Student Teams Achievement Division model on motivation and experimental class learning outcomes better than the control class. From the results of statistical analysis with t-test obtained obtained tcount = 2.869 and ttable = 2.086 with a significance level of 5% and N = 20, so that tcount > ttable (2,896 > 2,086) Ha1 is accepted. And the results of observations of learning motivation with t-test statistical analysis were obtained tcount = 3,787 and ttable = 2,086 with a significance level of 5% and N = 20, so that tcount > ttable (3,787 > 2,086) Ha2 is accepted. It can be concluded that scrapbook media through the Student Teams Achievement Division model is effective on student motivation and learning outcomes.

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