Multiple Comparison Procedures: The Practical Solution

Saville, David J.

doi:10.1080/00031305.1990.10475712

Cited by 491 publications

(223 citation statements)

References 15 publications

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“…Multiple t-tests were used to compare differences in responses to the sex, neutral, and feeding stimuli. We did not correct for these multiple comparisons because the t-tests were planned in advance to test our hypothesis and because of the nature of our study design multiple t-tests were required (Saville, 1990).…”

Section: Discussionmentioning

confidence: 99%

Feederism: An Exaggeration of a Normative Mate Selection Preference?

et al. 2012

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Quinsey and Lalumière (1995) suggested that some, if not most, paraphilias are exaggerated manifestations of more normative and functional mate selection preferences. The present study tested whether Feederism, a fat fetish focused on erotic eating, feeding, and gaining weight, is an exaggeration of a sexual arousal pattern commonly seen in the general population. Thirty participants (15 men and 15 women) recruited from the general population were assessed using penile plethysmography and vaginal photoplethysmography, respectively. None of the participants were self-identified Feeders or Feedees. Participants were shown sexual, neutral, and feeding still images while listening to audio recordings of sexual, neutral, and feeding stories. Participants did not genitally respond to feeding stimuli. However, both men and women subjectively rated feeding stimuli as more sexually arousing than neutral stimuli. We discuss the discordance between physiological and self-reported sexual arousal in the context of sex differences in sexual concordance and implications for future research.

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Section: Discussionmentioning

confidence: 99%

Feederism: An Exaggeration of a Normative Mate Selection Preference?

et al. 2012

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“…Duncan's multiple range test (DMRT), adjusted for multiple contrasts, was used to compare mean values based on (Saville 1990). In all analyses, the level of significance was at least P = 0.05.…”

Section: Discussionmentioning

confidence: 99%

Tree squirrel abundance and demography in managed coniferous forests of British Columbia are within the range of natural fluctuations of old-growth stands

Sullivan

Ransome²,

Sullivan³

et al. 2017

Can. J. For. Res.

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Abstract:The American red squirrel (Tamiasciurus hudsonicus Exrleben) and northern flying squirrel (Glaucomys sabrinus Shaw) are important mammal species in coniferous forests that are widely distributed across temperate and boreal ecological zones. Although T. hudsonicus and G. sabrinus apparently prefer late-successional forests, their population dynamics show no clear pattern in young second-growth and old-growth conifer forests. We used a compilation of study results that had standardized methodology and sampling effort to compare tree squirrel responses across a range of forest conditions. We tested the hypotheses (H) that abundance, reproduction, recruitment, and survival would be higher in (H 1 ) old-growth than second-growth stands, (H 2 ) unthinned than thinned second-growth stands, and (H 3 ) lightly than heavily thinned stands. Tree squirrel populations in old-growth stands were considered the "standard" treatment to which other treatments in second-growth stands (unthinned and variously thinned) were compared. Thinned stands were grouped into low, medium, and high densities of trees. Datasets from seven published studies included 2804 Tamiasciurus and 837 G. sabrinus individuals, 25 study years, and 158 trapping periods. Mean abundance of Tamiasciurus was similar among treatment stands, ranging from 0.62 to 1.29·ha −1 . Mean numbers of G. sabrinus were highest in old-growth stands at 0.65·ha −1 , followed by the low-and medium-density stands at 0.50·ha −1 , the high-density stands at 0.25·ha −1 , and finally the unthinned second-growth stands at a low of 0.12·ha −1 . In terms of effect size, mean proportional change in abundance, relative to that within old-growth stands, of both squirrel species in the three thinned stands were within the range of natural fluctuations in old-growth stands. Populations of Tamiasciurus in the unthinned stands were not within the range of fluctuations in the old-growth stands. Mean number of successful pregnancies and total recruits were similar among stands for Tamiasciurus, with variability in female breeding and winter survival. Mean number of recruits of G. sabrinus was highest in old-growth stands with no other differences in demographic attributes among stands. The biological significance of these differences in demographic variables was small in terms of effect sizes. Tamiasciurus and G. sabrinus seem to persist in a relatively broad range of young managed forest habitats, as well as in old-growth stands.Key words: coniferous forests, Glaucomys sabrinus, managed stands, old-growth forest, population dynamics, Tamiasciurus.Résumé : L'écureuil roux américain (Tamiasciurus hudsonicus Exrleben) et le grand polatouche (Glaucomys sabrinus Shaw) sont deux espèces de mammifères d'importance dans les forêts de conifères qui couvrent une grande partie des biomes tempérés et boréaux. Mis à part le fait que T. hudsonicus et G. sabrinus semblent préférer les forêts de fin de succession, leur dynamique des populations ne montre pas de tendances nettes dans les jeunes forêts d...

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“…To test if the accuracies were equal across the plant, population, and community scales, the slopes of regression lines were compared to each other in a pairwise fashion using multiple analysis of covariance tests (ANCOVA; model effects: LAI E and LAI E ×scale) without an α-level correction for family-wise error. An α-level correction was not used because it inflates the type-II error rate and increases the likelihood of reporting falsely that HA is equally accurate across all scales (Saville 1990). …”

Section: Discussionmentioning

confidence: 99%

A reference-based approach for estimating leaf area and cover in the forest herbaceous layer

Walter

Burnham

Gilliam

et al. 2015

Environ Monit Assess

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Cover data are used to assess vegetative response to a variety of ecological factors. Estimating cover in the herbaceous layer of forests presents a problem because the communities are structurally complex and rich in species. The currently employed techniques for estimating cover are less than optimal for measuring such rich understories because they are inaccurate, slow, or impracticable. A reference-based approach to estimating cover is presented that compares the area of foliar surfaces to the area of an observer's hand. While this technique has been used to estimate cover in prior studies, its accuracy has not been tested. We tested this hand-area method at the individual plant, population, and community scales in a deciduous forest herbaceous layer, and in a separate farm experiment. The precision, accuracy, observer bias, and species bias of the method were tested by comparing the hand-estimated leaf area index values with actual leaf area index, measured using a leaf area meter. The hand-area method was very precise when regressed against actual leaf area index at the plant, population, and community scales (R(2) of 0.97, 0.93, and 0.87). Among the deciduous sites, the hand-area method overestimated leaf area index consistently by 39.1% at all scales. There was no observer bias detected at any scale, but plant overestimation bias was detected in one species at the population scale. The hand-area method is a rapid and reliable technique for estimating leaf area index or cover in the forest herbaceous layer and should be useful to field ecologists interested in answering questions at the plant, population, or community level.

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Multiple Comparison Procedures: The Practical Solution

Cited by 491 publications

References 15 publications

Feederism: An Exaggeration of a Normative Mate Selection Preference?

Feederism: An Exaggeration of a Normative Mate Selection Preference?

Tree squirrel abundance and demography in managed coniferous forests of British Columbia are within the range of natural fluctuations of old-growth stands

A reference-based approach for estimating leaf area and cover in the forest herbaceous layer

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