Using R-project for Free Statistical Analysis in Extension Research

Mangiafico, Salvatore S.

doi:10.34068/joe.51.03.11

Cited by 42 publications

(48 citation statements)

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“…and effect sizes reported for Fisher's exact tests are bias-corrected Cramer's V using the rcompanion package (Mangiafico, 2020). For η 2 , effect sizes of .01 to .06 are considered small, greater than .06 to .14 moderate, and greater than or equal to .14 large.…”

Section: Discussionmentioning

confidence: 99%

Associations between alcohol use and peripheral, genetic, and epigenetic markers of oxytocin in a general sample of young and older adults

et al. 2022

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Introduction: Human and nonhuman animal research suggests that greater oxytocin (OT) activity is protective against harmful substance use. Most research on this topic is preclinical, with few studies evaluating the association between substance use and individual differences in the human OT system. The present study sought to fill this gap by evaluating the relationship between alcohol use and multiple biological measures of OT activity in an overall low to moderate-drinking sample. Method:As part of a larger study, generally healthy young (n = 51) and older (n = 53) adults self-reported whether they regularly used alcohol and how much alcohol they consumed per week. Participants also provided blood samples from which peripheral OT, and in an age-heterogeneous subset of participants (n = 56) variation in the oxytocin receptor gene (the OXTR rs53576 polymorphism) and OXTR DNA methylation levels (at cytosine-guanine dinucleotide sites -860, -924, -934), were obtained.Results: A-allele carriers of the OXTR rs53579 polymorphism were less likely to regularly consume alcohol. Among regular alcohol consumers, number of alcoholic drinks per week was positively associated with peripheral OT in regression models excluding observations of high influence (postdiagnostic models). Number of alcoholic drinks per week was consistently negatively associated with OXTR DNA methylation at site -860; and with OXTR DNA methylation at site -924 in postdiagnostic models.

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Section: Discussionmentioning

confidence: 99%

Associations between alcohol use and peripheral, genetic, and epigenetic markers of oxytocin in a general sample of young and older adults

et al. 2022

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“…We found the data to be left‐skewed and nontransformable and thus used the nonparametric Brown–Mood test to test for differences in median chemical richness among groups and post hoc pairwise comparisons (controlling for the false discovery rate; Benjamini and Hochberg, 1995). These tests were conducted using the R packages coin (Hothorn et al, 2008) and rcompanion (Mangiafico, 2022). To compare the variance of chemical richness, we used Levene's test in the R package car (Fox and Weisberg, 2019; R Core Team, 2022).…”

Section: Methodsmentioning

confidence: 99%

“…(Wheeler and Torchiano, 2016). These were followed by post hoc pairwise permutation tests controlling for false discovery rate (Benjamini and Hochberg, 1995) using the pairwisePermutationMatrix function in the R package rcompanion (Mangiafico, 2022).…”

Section: Methodsmentioning

confidence: 99%

Compartmentalization of specialized metabolites across vegetative and reproductive tissues in two sympatric Psychotria species

Schneider

Carlson

Jos

et al. 2023

American J of Botany

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Premise: The specialized metabolites of plants are recognized as key chemical traits in mediating the ecology and evolution of sundry plant-biotic interactions, from pollination to seed predation. Intra-and interspecific patterns of specialized metabolite diversity have been studied extensively in leaves, but the diverse biotic interactions that contribute to specialized metabolite diversity encompass all plant organs. Focusing on two species of Psychotria shrubs, we investigated and compared patterns of specialized metabolite diversity in leaves and fruit with respect to each organ's diversity of biotic interactions. Methods: To evaluate associations between biotic interaction diversity and specialized metabolite diversity, we combined UPLC-MS metabolomic analysis of foliar and fruit specialized metabolites with existing surveys of leaf-and fruit-centered biotic interactions. We compared patterns of specialized metabolite richness and variance among vegetative and reproductive tissues, among plants, and between species. Results: In our study system, leaves interact with a far larger number of consumer species than do fruit, while fruit-centric interactions are more ecologically diverse in that they involve antagonistic and mutualistic consumers. This aspect of fruit-centric interactions was reflected in specialized metabolite richness-leaves contained more than fruit, while each organ contained over 200 organ-specific specialized metabolites. Within each species, leaf-and fruit-specialized metabolite composition varied independently of one another across individual plants. Contrasts in specialized metabolite composition were stronger between organs than between species. Conclusions: As ecologically disparate plant organs with organ-specific specialized metabolite traits, leaves and fruit can each contribute to the tremendous overall diversity of plant specialized metabolites.

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“…The relationship between the relative grain yield and the commonly used diagnostics tools (Mehlich-3 soil S, leaf S, and grain S) was established to determine the ability of each diagnostic tool in predicting grain yield response. In addition, a Cate-Nelson analysis (Cate & Nelson, 1971) was conducted in R Software using the package Rcompanion (Mangiafico, 2013), to determine a critical level of Mehlich-3 soil S and leaf S at which a 95% relative yield response was most likely to occur.…”

Section: Statistical Analysesmentioning

confidence: 99%

Ohio grain crop response to sulfur fertilization

et al. 2023

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Continuous declines in atmospheric sulfur (S) deposition along with increased S removal rates with crop harvest has the potential to lead to S deficiency in Ohio field crops. As a result, S fertilization has become more common over the past decade.However, the extent of S deficiency is unknown, as inherent soil properties and management practices influence S availability and uptake. We conducted 96 replicated trials, from 2013 to 2021 to (1) examine the response of corn (Zea mays L.), soybean [Glycine max (L.) Merr], and wheat (Triticum aestivum L.) to S application on a wide range of Ohio soils and differing management practices and (2) determine the ability of Mehlich-3 extractable S in soil, leaf S, and grain S concentrations to predict grain yield response to S fertilizer. Our results showed limited grain yield increases to S fertilization with an overall response rate of 7.3% (4 of 50 corn trials, 3 of 34 soybean trials, and 0 of 12 wheat trials). Sulfur fertilization increased leaf and grain S concentrations by 19.4% and 12% in corn, by 22.2% and 7.7% in soybean, and by 41.7% and 0% in wheat, respectively. These increases in leaf or grain S concentrations were not directly related to yield responses. Diagnostic tools of Mehlich-3 soil S, leaf S, and grain S concentrations failed to predict yield response to S. We conclude that S deficiency is not widespread in Ohio soils and that optimizing grain crop production does not currently require S fertilization. INTRODUCTIONSulfur (S) is essential for numerous plant processes but has not been traditionally applied to agricultural soils in the Midwest (Dick et al., 2008). Historically, relatively large rates of S were supplied from atmospheric deposition in readily available forms for plant absorption (Dick et al., 2008

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Using R-project for Free Statistical Analysis in Extension Research

Cited by 42 publications

References 0 publications

Associations between alcohol use and peripheral, genetic, and epigenetic markers of oxytocin in a general sample of young and older adults

Associations between alcohol use and peripheral, genetic, and epigenetic markers of oxytocin in a general sample of young and older adults

Compartmentalization of specialized metabolites across vegetative and reproductive tissues in two sympatric Psychotria species

Ohio grain crop response to sulfur fertilization

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