centralImputation: Fill in NA values with central statistics
In DMwR2: Functions and Data for the Second Edition of "Data Mining with R"

Description Usage Arguments Value Author(s) References See Also Examples

This function fills in any NA value in all columns of a data frame with the statistic of centrality (given by the function centralvalue()) of the respective column.

1	centralImputation(data)

data

The data frame

A new data frame with no NA values

Luis Torgo ltorgo@dcc.fc.up.pt

Torgo, L. (2016) Data Mining using R: learning with case studies, second edition, Chapman & Hall/CRC (ISBN-13: 978-1482234893).

http://ltorgo.github.io/DMwR2

knnImputation, centralValue, complete.cases, na.omit

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data(algae,package="DMwR2")
cleanAlgae <- centralImputation(algae)
summary(cleanAlgae)

    season       size       speed         mxPH            mnO2       
 autumn:40   large :45   high  :84   Min.   :5.600   Min.   : 1.500  
 spring:53   medium:84   low   :33   1st Qu.:7.700   1st Qu.: 7.775  
 summer:45   small :71   medium:83   Median :8.060   Median : 9.800  
 winter:62                           Mean   :8.012   Mean   : 9.125  
                                     3rd Qu.:8.400   3rd Qu.:10.800  
                                     Max.   :9.700   Max.   :13.400  
       Cl               NO3              NH4                oPO4       
 Min.   :  0.222   Min.   : 0.050   Min.   :    5.00   Min.   :  1.00  
 1st Qu.: 11.066   1st Qu.: 1.312   1st Qu.:   38.78   1st Qu.: 15.90  
 Median : 32.730   Median : 2.675   Median :  103.17   Median : 40.15  
 Mean   : 43.091   Mean   : 3.276   Mean   :  497.31   Mean   : 73.26  
 3rd Qu.: 56.975   3rd Qu.: 4.421   3rd Qu.:  225.65   3rd Qu.: 98.00  
 Max.   :391.500   Max.   :45.650   Max.   :24064.00   Max.   :564.60  
      PO4              Chla               a1              a2        
 Min.   :  1.00   Min.   :  0.200   Min.   : 0.00   Min.   : 0.000  
 1st Qu.: 42.79   1st Qu.:  2.138   1st Qu.: 1.50   1st Qu.: 0.000  
 Median :103.29   Median :  5.475   Median : 6.95   Median : 3.000  
 Mean   :137.54   Mean   : 13.461   Mean   :16.92   Mean   : 7.458  
 3rd Qu.:213.25   3rd Qu.: 17.200   3rd Qu.:24.80   3rd Qu.:11.375  
 Max.   :771.60   Max.   :110.456   Max.   :89.80   Max.   :72.600  
       a3               a4               a5               a6        
 Min.   : 0.000   Min.   : 0.000   Min.   : 0.000   Min.   : 0.000  
 1st Qu.: 0.000   1st Qu.: 0.000   1st Qu.: 0.000   1st Qu.: 0.000  
 Median : 1.550   Median : 0.000   Median : 1.900   Median : 0.000  
 Mean   : 4.309   Mean   : 1.992   Mean   : 5.064   Mean   : 5.964  
 3rd Qu.: 4.925   3rd Qu.: 2.400   3rd Qu.: 7.500   3rd Qu.: 6.925  
 Max.   :42.800   Max.   :44.600   Max.   :44.400   Max.   :77.600  
       a7        
 Min.   : 0.000  
 1st Qu.: 0.000  
 Median : 1.000  
 Mean   : 2.495  
 3rd Qu.: 2.400  
 Max.   :31.600