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yaImpute (version 1.0-24)

Nearest Neighbor Observation Imputation and Evaluation Tools

Description

Performs nearest neighbor-based imputation using one or more alternative approaches to processing multivariate data. These include methods based on canonical correlation analysis, canonical correspondence analysis, and a multivariate adaptation of the random forest classification and regression techniques of Leo Breiman and Adele Cutler. Additional methods are also offered. The package includes functions for comparing the results from running alternative techniques, detecting imputation targets that are notably distant from reference observations, detecting and correcting for bias, bootstrapping and building ensemble imputations, and mapping results.

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Version

Install

install.packages('yaImpute')

Monthly Downloads

4,669

Version

1.0-24

License

GPL (>= 2)

Maintainer

Nicholas Crookston

Last Published

May 16th, 2015

Functions in yaImpute (1.0-24)

foruse

Report a complete imputation
bestVars

Computes the number of best X-variables
compare.yai

Compares different k-NN solutions
plot.varSel

Boxplot of mean Mahalanobis distances from varSelection()
MoscowMtStJoe

Moscow Mountain and St. Joe Woodlands (Idaho, USA) Tree and LiDAR Data
cor.yai

Correlation between observed and imputed
grmsd

Generalized Root Mean Square Distance Between Observed and Imputed Values
predict.yai

Generic predict function for class yai
correctBias

Correct bias by selecting different near neighbors
errorStats

Compute error components of k-NN imputations
notablyDifferent

Finds obervations with large differences between observed and imputed values
mostused

Tabulate references most often used in imputation
newtargets

Finds K nearest neighbors for new target observations
yai

Find K nearest neighbors
vars

List variables in a yai object
impute.yai

Impute variables from references to targets
yaiVarImp

Reports or plots importance scores for yai method randomForest
plot.compare.yai

Plots a compare.yai object
ann

Approximate nearest neighbor search routines
unionDataJoin

Combines data from several sources
plot.notablyDifferent

Plots the scaled root mean square differences between observed and predicted
AsciiGridImpute

Imputes/Predicts data for Ascii Grid maps
buildConsensus

Finds the consensus imputations among a list of yai objects
ensembleImpute

Computes the mean, median, or mode among a list of impute.yai objects
varSelection

Select variables for imputation models
whatsMax

Find maximum column for each row
print.yai

Print a summary of a yai object
applyMask

Removes neighbors that share (or not) group membership with targets.
yaiRFsummary

Build Summary Data For Method RandomForest
plot.yai

Plot observed verses imputed data
rmsd.yai

Root Mean Square Difference between observed and imputed
TallyLake

Tally Lake, Flathead National Forest, Montana, USA
notablyDistant

Find notably distant targets