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Questions tagged [environmental-data]

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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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9 views

Appropriate analysis for univariate proportion data and environmental variables

I'm new to statistics so am trying to choose the best analysis to find if; There is a difference between canopy cover (0-100%) at different sites There is a relationship between canopy cover and ...
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1answer
403 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
25 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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0answers
792 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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39 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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2answers
44 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
128 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...
1
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1answer
81 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
24 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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0answers
318 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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1answer
524 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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3answers
478 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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204 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
173 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
669 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
108 views

What kind of clustering algorithm for clustering samples according to OTUs

I have data in the following form: ...
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0answers
331 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
1k 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
598 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
417 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 ...