correlation analysis

Knowledge graph centered on correlation analysis with 76 nodes and 155 connections. Top connected: Marmota flaviventris, Hummingbird, Bombus, Ipomopsis, Ligusticum porteri.

Method synopsis

Statistical analysis using mixed effects models to evaluate relationships between plant clumping treatment and temperature responses while accounting for random effects of individual plants and sampling dates.

Synthesized from method descriptions across 16 papers using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Current and lagged climate affects phenology across diverse taxonomic groups (2023), Proceedings of the Royal Society B. The protocol was originally introduced by Flowering date of taxonomic families predicts phenological sensitivity to temperature: Implications for forecasting the effects of climate change on unstudied taxa (2013), American Journal of Botany. Implementations in other papers (listed below) may differ.

1. Statistical analysis of climate cues
   Used generalized linear models followed by backward stepwise selection to examine which climate cues were most often important for different taxa. Weighted analysis by square root of number of years of data for each species to account for differences in sample size and thus precision of estimates. For plants, ran mixed-effects models with 'plot' as random factor to account for repeated observations across permanent plots. Used linear models followed by backward stepwise selection for first and median activity. Conducted separate mixed-effects models for plants, mammals, and amphibians containing climate cues lagged both one and 2 years, with species or event as random factors due to sample size limits.
   Quantities: Models run for each of 56 species across multiple climate variables, with species-specific sample sizes varying based on years of data collectionDuration: Analytical phase using 45 years of collected dataConditions: Statistical analysis conducted using standardized z-score transformed climate data
   Equipment: R v. 4.1.2, packages 'car', 'lme4', 'emmeans', 'stats', 'FactoMineR'

Papers Using This Protocol (16)

Species Studied With This Protocol