Questions tagged [environmental-data]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
0answers
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 ...
0
votes
1answer
166 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)...
1
vote
0answers
18 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 ...
2
votes
0answers
650 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 ...
0
votes
0answers
33 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 ...
1
vote
2answers
43 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, ...
0
votes
1answer
114 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
vote
1answer
80 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 ...
1
vote
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 ...
1
vote
0answers
297 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 ...
3
votes
1answer
482 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: ...
1
vote
3answers
463 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 ...
0
votes
0answers
193 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 ...
1
vote
0answers
169 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 ...
0
votes
0answers
662 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 ...
0
votes
1answer
107 views

What kind of clustering algorithm for clustering samples according to OTUs

I have data in the following form: ...
2
votes
0answers
328 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 ...
2
votes
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 ...
2
votes
0answers
577 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 ...
1
vote
0answers
415 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 ...