diff --git a/README.Rmd b/README.Rmd new file mode 100644 index 0000000..c48f9c1 --- /dev/null +++ b/README.Rmd @@ -0,0 +1,140 @@ +--- +title: "RSTooDs" +subtitle: "An R user interface to STooDs" +output: github_document +--- + +```{r setup, include=FALSE} +knitr::opts_chunk$set(echo=TRUE,results='hide', + fig.path = "man/readme/README-") +``` + +# Introduction + +STooDs is a framework to build and estimate probabilistic models for data varying in Space, Time or other Dimensions. The R package `RSTooDs` is built as an R User Interface to the [computational STooDs engine](https://github.com/STooDs-tools/STooDs). It defines classes (objects' properties and methods) for the various building blocks of a STooDs case study. Its typical usage is as follows: + +1. Assemble the dataset. +2. Define the probabilistic model and its constitutive objects (parameters, dimensions, processes). +3. Perform Bayesian-MCMC inference. +4. Read, analyse and use MCMC samples. + +```{r} +library(RSTooDs) +``` + +# A simple example + +River streamflow in Eastern Australia is influenced by the [El Niño Southern Oscillation](https://en.wikipedia.org/wiki/El_Niño-Southern_Oscillation), as explained in this [blog post](https://globxblog.inrae.fr/el-ninoz/). As an illustration, let's consider data from the Barnard River in New South Wales, Australia. The figures below show the average streamflow during the austral spring (September to November), and indeed it seems that negative values of the [nino3.4 index](https://psl.noaa.gov/gcos_wgsp/Timeseries/Nino34/), corresponding to [La Niña episodes](https://en.wikipedia.org/wiki/La_Niña), are associated with large streamflow. + +```{r fig.height=8, fig.width=9} +dat=read.table(file.path('man','readme','BarnardRiverStreamflow.txt'),header=TRUE) +par(mfrow=c(2,1)) +plot(dat$year,dat$streamflow,type='b',pch=19,xlab='Year',ylab='Streamflow (m3/s)',main='Time series') +plot(dat$nino,dat$streamflow,type='p',pch=19,xlab='Nino index',ylab='Streamflow (m3/s)',main='Association with Nino3.4 index') +``` + +A probabilistic model can be used to quantify the association between river streamflow and the nino index. For instance one could assume that observed streamflow values are realizations from a log-normal distribution whose first parameter (mu) varies as a function of the nino index. The few lines of codes below show how this can be specified with `RSTooDs`. + +```{r} +# Assemble the dataset with predictand Y and predictor X (aka covariate). +D=dataset(Y=dat['streamflow'],X=dat['nino']) +# Define formulas of the model +f=c('mu=m0+m1*nino','sigma=s0') +# Define parameters of the model and their prior distributions +m0=parameter('m0',init=1) # Improper flat prior by default +m1=parameter('m1',init=0,priorDist='Gaussian',priorPar=c(0,1)) +s0=parameter('s0',init=1,priorDist='FlatPrior+') +# Assemble the model - type getCatalogue() for a list of available distributions. +mod=model(dataset=D,parentDist='LogNormal',par=list(m0,m1,s0),formula=f) +``` + +Once the model is specified, the function `STooDs` can be called to perform MCMC sampling. It is recommended to first define a `workspace` folder where configuration and result files will be written. + +```{r} +wk=file.path(getwd(),'man','readme','wk') +STooDs(model=mod,workspace=wk) +``` + +MCMC samples can then be explored as illustrated below. Traces in orange correspond to the parameters, traces in blue correspond to the standard Bayesian inference functions (all in log space): prior, likelihood, hierarchical component (not used here) and posterior. + +```{r fig.height=3, fig.width=9} +mcmc=readMCMC(file=file.path(wk,'MCMC.txt')) +plotMCMC.trace(mcmc,mod,panelPerCol=4) +``` + +The function below plots histograms of all parameters. The parameter m1 appears to be largely negative, corresponding to the observed negative association between streamflow and the nino index. + +```{r fig.height=3, fig.width=9} +plotMCMC.par(mcmc,mod) +``` + +# A more complex example using spatial processes + +It is legitimate to ask whether the effect of El Nino would be the same, or would at least be similar, for nearby rivers. The data shown below correspond to 21 stations located in New South Wales and Queensland (source: [Bureau of Meteorology](http://www.bom.gov.au/water/hrs/)) and can be used to investigate this question. + +```{r fig.height=8, fig.width=9} +dat=read.table(file.path('man','readme','21RiversStreamflow.txt'),header=TRUE) +stations=read.table(file.path('man','readme','21Rivers.txt'),header=TRUE) +par(mfrow=c(2,1)) +plot(dat$year,dat$streamflow,type='p',pch=19,col=dat$space_index,xlab='Year',ylab='Streamflow (m3/s)',log='y',main='Time series') +plot(dat$nino,dat$streamflow,type='p',pch=19,col=dat$space_index,xlab='Nino index',ylab='Streamflow (m3/s)',log='y',main='Association with Nino3.4 index') +``` + +We are going to use a model similar to the previous one: observed streamflows are realizations from a log-normal distribution whose first parameter (mu) varies in time as a function of the nino index. However, since data are now varying in space as well, it is necessary to modify the model so that parameters may also vary in space. This can be achieved by first defining a space `dimension`, and then by attaching `processes` to it. In a nutshell, a process can hence be viewed as a parameter that varies along a given dimension. + +```{r} +# Assemble the dataset. Note the use of iDim (dimension index) to keep track of the site associated with each row. +D=dataset(Y=dat['streamflow'],X=dat['nino'],iDim=dat['space_index']) +# Define formulas of the model - same as previously, but now some parameters will vary in space and hence be treated as processes +f=c('mu=m0+m1*nino','sigma=s0') +# Create a 'space' dimension, with lon-lat coordinates and the corresponding Haversine distance +space=dimension('space',coord=stations[c('lon','lat')],d=distance('Haversine')) +# m0 is a "free" spatial process - no hyperdistribution +m0=process('m0',dim=space,init=1) # no hyper-distribution by default +# m0 is a Gaussian iid spatial process +m1=process('m1',dim=space,init=0,dist='Gaussian_IID', + par=list(parameter(name='m1_hypermean',init=0), + parameter(name='m1_hypersdev',init=1))) +# s0 is a parameter => it is assumed to be the same for all sites. +s0=parameter('s0',init=1,priorDist='FlatPrior+') +# Assemble the model - note the distinction between parameters and processes +mod=model(dataset=D,parentDist='LogNormal',par=list(s0),process=list(m0,m1),formula=f) +``` + +As previously, the function `STooDs` is called to perform MCMC sampling. + +```{r} +wk=file.path(getwd(),'man','readme','wk') +STooDs(model=mod,workspace=wk) +``` + +MCMC traces are shown below. Note that the processes appear in light green, and their hyper-parameters in dark green. + +```{r fig.height=15, fig.width=9} +mcmc=readMCMC(file=file.path(wk,'MCMC.txt')) +plotMCMC.trace(mcmc,mod,panelPerCol=4) +``` + +The function `plotMCMC.par` now plots histograms for parameters and hyper-parameters. + +```{r fig.height=3, fig.width=9} +plotMCMC.par(mcmc,mod) +``` + +The function `plotMCMC.process` can be used to see how the processes vary across the dimension (here, the sites). Values for the nino effect m1 are largely negative at all sites, confirming that El Nino has a consistent negative effect across this region. + +```{r fig.height=6, fig.width=9} +plotMCMC.process(mcmc,mod) +``` + +# Going further + +This README provides a very quick overview of the basic usage of the `RSTooDs` package. For more advanced usages, please consult the documentation of the functions and the vignettes of the package. In particular, the following capabilities of `RSTooDs` are potentially useful: + +1. The use of several random variables. +2. The handling of censored data. +3. The use of non-iid spatial or temporal processes. +4. The use of nearest-neighbour processes for large datasets. +5. The use of identifiability constraints for 'hidden covariates' models (aka 'latent variables' or 'latent factors' models). +6. etc. + diff --git a/README.md b/README.md index a1e67b2..9561e12 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,199 @@ -# RSTooDs -An R user interface to STooDs +RSTooDs +================ + +# Introduction + +STooDs is a framework to build and estimate probabilistic models for +data varying in Space, Time or other Dimensions. The R package `RSTooDs` +is built as an R User Interface to the [computational STooDs +engine](https://github.com/STooDs-tools/STooDs). It defines classes +(objects’ properties and methods) for the various building blocks of a +STooDs case study. Its typical usage is as follows: + +1. Assemble the dataset. +2. Define the probabilistic model and its constitutive objects + (parameters, dimensions, processes). +3. Perform Bayesian-MCMC inference. +4. Read, analyse and use MCMC samples. + + + +``` r +library(RSTooDs) +``` + +# A simple example + +River streamflow in Eastern Australia is influenced by the [El Niño +Southern +Oscillation](https://en.wikipedia.org/wiki/El_Niño-Southern_Oscillation), +as explained in this [blog post](https://globxblog.inrae.fr/el-ninoz/). +As an illustration, let’s consider data from the Barnard River in New +South Wales, Australia. The figures below show the average streamflow +during the austral spring (September to November), and indeed it seems +that negative values of the [nino3.4 +index](https://psl.noaa.gov/gcos_wgsp/Timeseries/Nino34/), corresponding +to [La Niña episodes](https://en.wikipedia.org/wiki/La_Niña), are +associated with large +streamflow. + +``` r +dat=read.table(file.path('man','readme','BarnardRiverStreamflow.txt'),header=TRUE) +par(mfrow=c(2,1)) +plot(dat$year,dat$streamflow,type='b',pch=19,xlab='Year',ylab='Streamflow (m3/s)',main='Time series') +plot(dat$nino,dat$streamflow,type='p',pch=19,xlab='Nino index',ylab='Streamflow (m3/s)',main='Association with Nino3.4 index') +``` + +![](man/readme/README-unnamed-chunk-2-1.png) + +A probabilistic model can be used to quantify the association between +river streamflow and the nino index. For instance one could assume that +observed streamflow values are realizations from a log-normal +distribution whose first parameter (mu) varies as a function of the nino +index. The few lines of codes below show how this can be specified with +`RSTooDs`. + +``` r +# Assemble the dataset with predictand Y and predictor X (aka covariate). +D=dataset(Y=dat['streamflow'],X=dat['nino']) +# Define formulas of the model +f=c('mu=m0+m1*nino','sigma=s0') +# Define parameters of the model and their prior distributions +m0=parameter('m0',init=1) # Improper flat prior by default +m1=parameter('m1',init=0,priorDist='Gaussian',priorPar=c(0,1)) +s0=parameter('s0',init=1,priorDist='FlatPrior+') +# Assemble the model - type getCatalogue() for a list of available distributions. +mod=model(dataset=D,parentDist='LogNormal',par=list(m0,m1,s0),formula=f) +``` + +Once the model is specified, the function `STooDs` can be called to +perform MCMC sampling. It is recommended to first define a `workspace` +folder where configuration and result files will be written. + +``` r +wk=file.path(getwd(),'man','readme','wk') +STooDs(model=mod,workspace=wk) +``` + +MCMC samples can then be explored as illustrated below. Traces in orange +correspond to the parameters, traces in blue correspond to the standard +Bayesian inference functions (all in log space): prior, likelihood, +hierarchical component (not used here) and posterior. + +``` r +mcmc=readMCMC(file=file.path(wk,'MCMC.txt')) +plotMCMC.trace(mcmc,mod,panelPerCol=4) +``` + +![](man/readme/README-unnamed-chunk-5-1.png) + +The function below plots histograms of all parameters. The parameter m1 +appears to be largely negative, corresponding to the observed negative +association between streamflow and the nino index. + +``` r +plotMCMC.par(mcmc,mod) +``` + +![](man/readme/README-unnamed-chunk-6-1.png) + +# A more complex example using spatial processes + +It is legitimate to ask whether the effect of El Nino would be the same, +or would at least be similar, for nearby rivers. The data shown below +correspond to 21 stations located in New South Wales and Queensland +(source: [Bureau of Meteorology](http://www.bom.gov.au/water/hrs/)) and +can be used to investigate this +question. + +``` r +dat=read.table(file.path('man','readme','21RiversStreamflow.txt'),header=TRUE) +stations=read.table(file.path('man','readme','21Rivers.txt'),header=TRUE) +par(mfrow=c(2,1)) +plot(dat$year,dat$streamflow,type='p',pch=19,col=dat$space_index,xlab='Year',ylab='Streamflow (m3/s)',log='y',main='Time series') +plot(dat$nino,dat$streamflow,type='p',pch=19,col=dat$space_index,xlab='Nino index',ylab='Streamflow (m3/s)',log='y',main='Association with Nino3.4 index') +``` + +![](man/readme/README-unnamed-chunk-7-1.png) + +We are going to use a model similar to the previous one: observed +streamflows are realizations from a log-normal distribution whose first +parameter (mu) varies in time as a function of the nino index. However, +since data are now varying in space as well, it is necessary to modify +the model so that parameters may also vary in space. This can be +achieved by first defining a space `dimension`, and then by attaching +`processes` to it. In a nutshell, a process can hence be viewed as a +parameter that varies along a given +dimension. + +``` r +# Assemble the dataset. Note the use of iDim (dimension index) to keep track of the site associated with each row. +D=dataset(Y=dat['streamflow'],X=dat['nino'],iDim=dat['space_index']) +# Define formulas of the model - same as previously, but now some parameters will vary in space and hence be treated as processes +f=c('mu=m0+m1*nino','sigma=s0') +# Create a 'space' dimension, with lon-lat coordinates and the corresponding Haversine distance +space=dimension('space',coord=stations[c('lon','lat')],d=distance('Haversine')) +# m0 is a "free" spatial process - no hyperdistribution +m0=process('m0',dim=space,init=1) # no hyper-distribution by default +# m0 is a Gaussian iid spatial process +m1=process('m1',dim=space,init=0,dist='Gaussian_IID', + par=list(parameter(name='m1_hypermean',init=0), + parameter(name='m1_hypersdev',init=1))) +# s0 is a parameter => it is assumed to be the same for all sites. +s0=parameter('s0',init=1,priorDist='FlatPrior+') +# Assemble the model - note the distinction between parameters and processes +mod=model(dataset=D,parentDist='LogNormal',par=list(s0),process=list(m0,m1),formula=f) +``` + +As previously, the function `STooDs` is called to perform MCMC sampling. + +``` r +wk=file.path(getwd(),'man','readme','wk') +STooDs(model=mod,workspace=wk) +``` + +MCMC traces are shown below. Note that the processes appear in light +green, and their hyper-parameters in dark green. + +``` r +mcmc=readMCMC(file=file.path(wk,'MCMC.txt')) +plotMCMC.trace(mcmc,mod,panelPerCol=4) +``` + +![](man/readme/README-unnamed-chunk-10-1.png) + +The function `plotMCMC.par` now plots histograms for parameters and +hyper-parameters. + +``` r +plotMCMC.par(mcmc,mod) +``` + +![](man/readme/README-unnamed-chunk-11-1.png) + +The function `plotMCMC.process` can be used to see how the processes +vary across the dimension (here, the sites). Values for the nino effect +m1 are largely negative at all sites, confirming that El Nino has a +consistent negative effect across this region. + +``` r +plotMCMC.process(mcmc,mod) +``` + +![](man/readme/README-unnamed-chunk-12-1.png) + +# Going further + +This README provides a very quick overview of the basic usage of the +`RSTooDs` package. For more advanced usages, please consult the +documentation of the functions and the vignettes of the package. In +particular, the following capabilities of `RSTooDs` are potentially +useful: + +1. The use of several random variables. +2. The handling of censored data. +3. The use of non-iid spatial or temporal processes. +4. The use of nearest-neighbour processes for large datasets. +5. The use of identifiability constraints for ‘hidden covariates’ + models (aka ‘latent variables’ or ‘latent factors’ models). +6. etc. diff --git a/man/readme/.gitignore b/man/readme/.gitignore new file mode 100644 index 0000000..8d8cff8 --- /dev/null +++ b/man/readme/.gitignore @@ -0,0 +1 @@ +wk/ diff --git a/man/readme/21Rivers.txt b/man/readme/21Rivers.txt new file mode 100644 index 0000000..83cba9b --- /dev/null +++ b/man/readme/21Rivers.txt @@ -0,0 +1,22 @@ +"ID_BoM" "lon" "lat" "area" +"136202D" 152.04378 -26.30122 646.6 +"137201A" 152.36875 -25.26625 449.3 +"143009A" 152.40875 -26.99639 3875.5 +"143303A" 152.8403 -26.83875 101.7 +"145010A" 152.89125 -28.24625 129 +"145011A" 152.57125 -28.14799 85.1 +"145018A" 152.60839 -28.21911 82.4 +"145101D" 153.04547 -28.05297 165.9 +"145107A" 153.15875 -27.99625 102.3 +"146012A" 153.42301 -28.17875 29 +"146095A" 153.40375 -28.14922 55.8 +"204034" 152.214 -29.7635 398.9 +"206014" 152.02886 -30.47636 377.4 +"206018" 151.76625 -31.05125 851.9 +"208007" 151.71625 -31.51625 221.1 +"208009" 151.31495 -31.57995 152.1 +"418005" 151.11432 -29.91682 249.3 +"418014" 151.36244 -30.46744 834.6 +"419005" 150.7785 -30.6785 2532.4 +"422321B" 152.33307 -28.35375 31.6 +"422394A" 152.14136 -28.37136 328.4 diff --git a/man/readme/21RiversStreamflow.txt b/man/readme/21RiversStreamflow.txt new file mode 100644 index 0000000..3464d25 --- /dev/null +++ b/man/readme/21RiversStreamflow.txt @@ -0,0 +1,1071 @@ +"year" "streamflow" "space_index" "nino" +1965 0.551527447089947 1 1.63181500906934 +1966 0.361340468559219 1 -0.285327393332258 +1967 0.218978123728124 1 -0.563622258197004 +1968 0.037168396418396 1 0.38464172578658 +1969 0.123748613654864 1 0.700729723883511 +1970 0.052022270553521 1 -0.938117813653332 +1971 0.326919315843621 1 -0.962167994031641 +1972 0.687990778897029 1 1.81047343739862 +1973 2.26877692562067 1 -1.86576736320249 +1974 1.43292175417175 1 -0.71479478081853 +1975 0.585488006206756 1 -1.56685806390332 +1976 1.49784652269027 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