Questions tagged [environmental-data]

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Modelling community as random effect based on community-level exposure?

I am conducting community/school research to exploring the health impact of environmental exposures (e.g., air pollution). The exposure is predicted based on the address of the community/school ...
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34 views

Comparing regions by minimium, mean, and maximum (of temporal data)

I’m writing a review paper upon air contamination. I discuss the values of one pollutant factor (CO₂) in the whole country. I gathered many previous papers that estimate the CO₂ level in various ...
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25 views

What is the best way to do a metanalysis for half-life?

I am working on a meta-analysis on pesticide degradation, where the quantity of interest is the difference in half-life in different environments. However I am in doubt of how to use the data; in all ...
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31 views

How to analyse temporal variation in R---vigilance of birds

I am currently doing a project for my Bachelor degree, for which I study vigilance in birds. Obviously, I have to analyse the data statistically. However, I do not know where to begin since I do not ...
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1answer
55 views

Correlation between heavy metals and community data

This is a preliminary study. I want to test whether the presence of heavy metals in surface water negatively affects the benthic macroinvertebrate community. If it's the case, I'll continue the ...
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0answers
15 views

finding the correlation between population density in a city and the city's PM 25 value

I am a high school student doing a report for my environmental science course, IB diploma. My question is about how to find the correlation between two data sets. My question of interest is whether ...
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1answer
2k views

Preparing data for cross-correlation time series

I have several data sets with air quality measurements for 20 locations. The measurements were done per second over a period of two weeks, 5 locations per period (because there were only 5 instruments)...
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0answers
42 views

How to develop the EKC regression model?

I want to use the environmental Kuznets curve (EKC) to check the relationship between increase economic growth and environmental degradation, but I am faced with a challenge on how and where to build ...
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1k views

R vegan: RDA vs CCA, which test to answer my research question and which results to report?

(if my question should be cut up into sub-questions please let me know, since all those questions are related I decided to ask them here together as one long question) Main question As part of my ...
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55 views

Arithmetic Mean Versus Geometric Mean for Environmental Measurements

The following comment was made by whuber in response to the question Which “mean” to use and when? ... in many cases the right mean to use is determined by the question we are trying to answer ...
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1answer
51 views

Learning time series analysis in hydrogeology

Good morning, I know there are some similar questions, but I'm asking anyway since I didn't find a suitable answer for what I'm looking for. I've got some daily hydrological data about a spring, ...
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1answer
179 views

Structural change analysis validity in case of auto-correlated data?

I attempted to assess the "significance" of some environmental alteration through the identification of break points in a diagnostic time series (using R strucchange...
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1answer
82 views

ANOVA, Linear Models, or something else?

I'm a rookie in statistics, but just wrapped up a semester of R analysis for natural resources. I'm working on my grad capstone and hoping I might be able to get some help generating ideas for ...
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0answers
26 views

Impact of process efficiency on global warming potential

I am an environmental chemistry who is studying the impact of process efficiency improvements of a specific sector on global warming potential (GWP). A have data from 288 firms and I have already ...
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393 views

Do I need to standardize environmental data before canonical correspondence analysis?

I have a dataset of 15 environmental variables (soil physical and chemical properties) and about 25 "species" variables for about 40 sampling sites. I want to do a CCA to analyse the effects of the ...
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2answers
617 views

What to do if time series data remains autocorrelated?

Data: I have 92 years of monthly climate data. One of my variables is a drought index (SPEI) ranging from -2 (dry) to 2 (wet). All the data can be found here. Data Structure: ...
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4answers
541 views

Change Point Analysis for Environmental Data

Does anyone know of somewhere with resources on using change point analysis for determining environmental threshold values? Let me emphasize that this is NOT time series data. Change point analysis is ...
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226 views

Change point analysis along an environmental gradient

I am looking at environmental data - habitat scores and stream conductivity (water quality measure) and looking to do some change point analysis in a set of 178 observations. As opposed to a more ...
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0answers
177 views

Best method of analysis for negatively skewed longitudinal environmental data?

I have a dataset composed of a dependent variable (species percent cover) and a range of abiotic variables (salinity, temperature, pH, water movement etc). It is a longitudinal study, in which species ...
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0answers
681 views

PERMANOVA Design

My aim is to quantify temporal change in community composition by measuring community composition through time at several plots using randomly placed quadrats. The idea would be to repeat surveys at ...
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1answer
116 views

What kind of clustering algorithm for clustering samples according to OTUs

I have data in the following form: ...
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0answers
338 views

Population genetics: analysis of allele frequency distribution along environmental gradients

Is there a software or a R package that does a simulation of spatial distribution of alleles? I'm interested in how a distribution of alleles of functional loci is shaped by a pattern of environmental ...
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1answer
2k views

How to compute a measure of distance between sites with continuous variables?

I have a dataframe with each row being a different site (51 sites), and each column being mean values of a different continuous environmental variable (19 variables). I am trying to calculate a ...
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0answers
641 views

Compositional analysis vs. Manly selection ratios

I am comparing habitat availability vs. use by a bird species using the R compana() function (package adehabitat) which uses Aebischer et al. (1993) method. It is a ...
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0answers
425 views

What is best for comparing variability for environmental time series data: repeated-measures ANOVA or linear mixed models?

I've collected environmental data on the dust level using direct-reading instruments. The outputs from the instruments are concentrations recorded at each minute over 1 hour. The data collected at ...