sperrorest 2.1.1 (15-Oct-2017)
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Bugfixes:
  * `train_fun` and `test_fun` are now handled correctly and eventual sub-sampling is correctly reflected to the resulting 'resampling' object


sperrorest 2.1.0 (25-Sep-2017)
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Features:
  * error handling during model fitting & performance evaluation: If a model does not converge for some folds or an error occurs during performance calculation, results of this fold are set to `NA` and a message is printed to the console. `sperrorest()` will continue normally and uses the successful folds to calculate the repetition error. This helps to run CV with many repetitions using models which do not always converge like `maxnet()`, `gamm()` or `svm()`.

Bugfixes:
  * Size of example data set `ecuador` has been adjusted to avoid exact duplicates of partitions when using `partition_kmeans()`.

sperrorest 2.0.1 (20-Jul-2017)
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Bugfixes:
  * Fixes a bug which caused equal importance of all predictors when performing permutation-based variable importance assessment

sperrorest 2.0.0 (12-Jun-2017)
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Major:
  * integration of `parsperrorest()` into `sperrorest()`.
  * by default, `sperrorest()` now runs in parallel using all available cores.
  * `runfolds()` and `runreps()` are now doing the heavy lifting in the background. All modes are now running on the same code base. Before, all parallel modes were running on different code implementations.
  * function and argument name changes to 'snake_case'.

Features:
  * new (parallel) modes:
    * `apply`: calls `pbmclapply()` on Unix and `pbapply()` on Windows.
    * `future`: calls `future_lapply()` with various `future` options (`multiprocess`, `multicore`, etc.).
    * `foreach`: `foreach()` with various `future` options (`multiprocess`, `multicore`, etc.). Default option to `cluster`. This is also the overall default mode for `sperrorest()`.
    * `sequential`: sequential execution using `future` backend.
  * RMSE instead of MSE as error measure
  * You can now pass also single values to `repetition` argument of `sperrorest()`. Specifying a range like `repetition = 1:10` will also stay valid.
  * New vignette `sperrorest::parallel-modes` comparing the various parallel modes.
  * New vignette `sperrorest::custom-pred-and-model-functions` explaining why and how custom defined model and predict functions are needed for some model setups.

Misc:
  * Limit workers to number of repetitions if number of cores > number of repetitions. This ensures that no unnecessary workers are started and increases robustness of parallel execuction.
  * documentation improvements.
  * `do_try` argument has been removed.
  * `error.fold`, `error.rep` and `err.train` arguments have been removed because they are all calculated by default now.

Bugfixes:
  * partial matching of arguments.
  * account for factor levels only present in test data but missing in training data. Previously, `sperrorest` errored during the predict step when this case occured. Now, this is accounted for and an informative message is given.

sperrorest 1.0.0 (08-Mar-2017)
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New features:
  * add `parsperrorest()`: This function lets you exexute `sperrorest()` in parallel. It includes two modes (`par.mode = 1` and `par.mode = 2`) which use different   parallelization approaches in the background. See `?parsperrorest()` for more details.

  * add `partition.factor.cv()`: This resampling method enables partitioning based
  on a given factor variable. This can be used, for example, to resample
  agricultural data, that is grouped by fields, at the agricultural field level
  in order to preserve spatial autocorrelation within fields.

  * `sperrorest()` and `parsperrorest()`: Add `benchmark` item to returned object giving information about execution time, used cores and other system details.

Changes to functions:
  * `sperrorest`(): Change argument naming. `err.unpooled` is now `error.fold` and `err.pooled` is now `error.rep`

  * `sperrorest()` and `parsperrorest()`: Change order and naming of returned object
      - class `sperrorestpoolederror` is now `sperrorestreperror`
      - returned `sperrorest` list is now ordered as follows:
           1. error.rep
           2. error.fold
           3. importance
           4. benchmarks
           5. package.version

Package related:
  * add package NEWS

  * add package vignette -> `vignette("sperrorest-vignette", package = "sperrorest")`

  * package is now ByteCompiled

  * Github repo of `sperrorest` now at https://github.com/pat-s/sperrorest

sperrorest 0.2-1 (19 June 2012)
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* First release on CRAN


sperrorest 0.2-0 (19 June 2012)
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* last pre-release version
* replaced Stoyan's data set with Jannes Muenchow's data, adapted examples


sperrorest 0.1-5 (1 Mar 2012)
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* made training set estimation optional
* robustified code using try()


sperrorest 0.1-2 (29 Jan 2012)
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* internal release 0.1-2
* some bug fixes, e.g. in err.* functions
* improved support of pooled versus unpooled error estimation
* changed some argument names
* this version was used for Angie's analyses


sperrorest 0.1-1 (29 Dec 2011)
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* built internal release 0.1-1


sperrorest 0.1
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* general code development (2009 - 2011)
* package project and documentation created (Oct-Dec 2011)
