R/outliers.R
indicate_outliers.RdCreates new columns to indicate which values are outliers based on the average value.
indicate_outliers(
data,
select_columns = NULL,
group_variable,
std_dev_value = 1.96,
zero_is_outlier = FALSE
)A data.frame
A string or vector of strings with the name(s) of the numeric columns to check for outliers. If NULL (default), will use all numeric columns in the data.
A string with the name of the column with the grouping variable.
A number indicating how many standard deviations away from the mean to determine if a value is an outlier.
If TRUE (not default), reports any zero value as an outlier.
The initial data.frame with new columns for each numeric variable included with a value of 0 if not an outlier and 1 if that row is an outlier.
indicate_outliers(mtcars, "drat", group_variable = "am")
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
#> Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
#> Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
#> Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
#> Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
#> Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1
#> Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4
#> Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
#> Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
#> Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4
#> Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4
#> Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
#> Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
#> Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3
#> Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4
#> Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4
#> Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
#> Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
#> Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
#> Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
#> Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
#> Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2
#> AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2
#> Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4
#> Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2
#> Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1
#> Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2
#> Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2
#> Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
#> Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6
#> Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8
#> Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2
#> drat_outlier1.96 drat_outlier1.96_ever
#> Mazda RX4 0 1
#> Mazda RX4 Wag 0 1
#> Datsun 710 0 1
#> Hornet 4 Drive 0 0
#> Hornet Sportabout 0 0
#> Valiant 0 0
#> Duster 360 0 0
#> Merc 240D 0 0
#> Merc 230 0 0
#> Merc 280 0 0
#> Merc 280C 0 0
#> Merc 450SE 0 0
#> Merc 450SL 0 0
#> Merc 450SLC 0 0
#> Cadillac Fleetwood 0 0
#> Lincoln Continental 0 0
#> Chrysler Imperial 0 0
#> Fiat 128 0 1
#> Honda Civic 1 1
#> Toyota Corolla 0 1
#> Toyota Corona 0 0
#> Dodge Challenger 0 0
#> AMC Javelin 0 0
#> Camaro Z28 0 0
#> Pontiac Firebird 0 0
#> Fiat X1-9 0 1
#> Porsche 914-2 0 1
#> Lotus Europa 0 1
#> Ford Pantera L 0 1
#> Ferrari Dino 0 1
#> Maserati Bora 0 1
#> Volvo 142E 0 1
#> drat_outlier1.96_freq
#> Mazda RX4 1
#> Mazda RX4 Wag 1
#> Datsun 710 1
#> Hornet 4 Drive 0
#> Hornet Sportabout 0
#> Valiant 0
#> Duster 360 0
#> Merc 240D 0
#> Merc 230 0
#> Merc 280 0
#> Merc 280C 0
#> Merc 450SE 0
#> Merc 450SL 0
#> Merc 450SLC 0
#> Cadillac Fleetwood 0
#> Lincoln Continental 0
#> Chrysler Imperial 0
#> Fiat 128 1
#> Honda Civic 1
#> Toyota Corolla 1
#> Toyota Corona 0
#> Dodge Challenger 0
#> AMC Javelin 0
#> Camaro Z28 0
#> Pontiac Firebird 0
#> Fiat X1-9 1
#> Porsche 914-2 1
#> Lotus Europa 1
#> Ford Pantera L 1
#> Ferrari Dino 1
#> Maserati Bora 1
#> Volvo 142E 1
indicate_outliers(mtcars, "drat", group_variable = "am", zero_is_outlier = TRUE)
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
#> Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
#> Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
#> Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
#> Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
#> Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1
#> Duster 360 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4
#> Merc 240D 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
#> Merc 230 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
#> Merc 280 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4
#> Merc 280C 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4
#> Merc 450SE 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
#> Merc 450SL 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
#> Merc 450SLC 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3
#> Cadillac Fleetwood 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4
#> Lincoln Continental 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4
#> Chrysler Imperial 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
#> Fiat 128 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
#> Honda Civic 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
#> Toyota Corolla 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
#> Toyota Corona 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
#> Dodge Challenger 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2
#> AMC Javelin 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2
#> Camaro Z28 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4
#> Pontiac Firebird 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2
#> Fiat X1-9 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1
#> Porsche 914-2 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2
#> Lotus Europa 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2
#> Ford Pantera L 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
#> Ferrari Dino 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6
#> Maserati Bora 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8
#> Volvo 142E 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2
#> drat_outlier1.96 drat_outlier1.96_ever
#> Mazda RX4 0 1
#> Mazda RX4 Wag 0 1
#> Datsun 710 0 1
#> Hornet 4 Drive 0 0
#> Hornet Sportabout 0 0
#> Valiant 0 0
#> Duster 360 0 0
#> Merc 240D 0 0
#> Merc 230 0 0
#> Merc 280 0 0
#> Merc 280C 0 0
#> Merc 450SE 0 0
#> Merc 450SL 0 0
#> Merc 450SLC 0 0
#> Cadillac Fleetwood 0 0
#> Lincoln Continental 0 0
#> Chrysler Imperial 0 0
#> Fiat 128 0 1
#> Honda Civic 1 1
#> Toyota Corolla 0 1
#> Toyota Corona 0 0
#> Dodge Challenger 0 0
#> AMC Javelin 0 0
#> Camaro Z28 0 0
#> Pontiac Firebird 0 0
#> Fiat X1-9 0 1
#> Porsche 914-2 0 1
#> Lotus Europa 0 1
#> Ford Pantera L 0 1
#> Ferrari Dino 0 1
#> Maserati Bora 0 1
#> Volvo 142E 0 1
#> drat_outlier1.96_freq
#> Mazda RX4 1
#> Mazda RX4 Wag 1
#> Datsun 710 1
#> Hornet 4 Drive 0
#> Hornet Sportabout 0
#> Valiant 0
#> Duster 360 0
#> Merc 240D 0
#> Merc 230 0
#> Merc 280 0
#> Merc 280C 0
#> Merc 450SE 0
#> Merc 450SL 0
#> Merc 450SLC 0
#> Cadillac Fleetwood 0
#> Lincoln Continental 0
#> Chrysler Imperial 0
#> Fiat 128 1
#> Honda Civic 1
#> Toyota Corolla 1
#> Toyota Corona 0
#> Dodge Challenger 0
#> AMC Javelin 0
#> Camaro Z28 0
#> Pontiac Firebird 0
#> Fiat X1-9 1
#> Porsche 914-2 1
#> Lotus Europa 1
#> Ford Pantera L 1
#> Ferrari Dino 1
#> Maserati Bora 1
#> Volvo 142E 1