Remove outliers with R studio

[hazarooni]

Hi,

Im trying to detect and remove outliers from a data set with categorical and numeric value.
I need simple code using R studio.

I tried the code in this topic and it used to work with me. However, now when I run the code it gives an error.

How do I remove outliers?

Yes. A value under the first quantile minus 1.5 the IQR or over the third quantile plus 1.5 times the IQR. They are the dots drawed by boxplots, as I understand.

The error I get:
Error in UseMethod("slice") :
no applicable method for 'slice' applied to an object of class "data.frame"

can I get a simple code that can do the job.

Thanks.

the code I'm using:

library(tidyverse)

df_to_clean <- NYC1

#the data.frame may contain more than only number columns, 
# so determine the names of the number columns
(to_do <- df_to_clean %>%
  select(where(is.numeric)) %>%
  names())

 

# calculated first and 3rd quartile
calc_quants <- function(x) {
  map(
    to_do,
    ~ {
      enframe(quantile(x[[.]], probs = c(.25, .75)),
        value = .
      )
    }
  ) %>% reduce(left_join)
}
(inner_quartile_df <- calc_quants(df_to_clean))


# re organise quartile info
(iq_df2 <- inner_quartile_df %>%
  rename(quantile = name) %>%
  pivot_longer(cols = -"quantile") %>%
  group_by(quantile) %>%
  group_split())

(iqr_df <- left_join(iq_df2[[1]],
  iq_df2[[2]],
  by = "name"
) %>%
  select(name, lower = value.x, upper = value.y) %>%
  mutate(
    iqr = upper - lower,
    low_crit = lower - iqr * 1.5,
    hi_crit = upper + iqr * 1.5
  ))

# for each column to process, determing the rows it would omit,
# collate these 
(rows_to_omit <- map(
  to_do,
  ~ {
    ovec <- pull(
      df_to_clean,
      .x
    )
    criteria <- filter(iqr_df, name == .x)
    which(!between(
      x = ovec, left = criteria$low_crit,
      right = criteria$hi_crit
    ))
  }
) %>% unlist() %>% sort() %>% unique())

# finish
NYC3 <- df_to_clean %>%
  slice(-rows_to_omit)

[nirgrahamuk]

what do you get for

getAnywhere(slice)

probably you have loaded a library that masks dplyr::slice; it would probably solve to be explicit in this code and change it to use dplyr::slice instead of slice per se

[hazarooni]

amazing! it worked :))))

I cant thank you enough. I realy appreciate it