R retain the value to next record like SAS

In R, you can retain values from one record to the next by using the lag() function from the dplyr package.

Here's an example of how you can use lag() to retain values:

library(dplyr)

# Create a data frame with a column of values
df <- data.frame(value = c(1, 2, 3, 4, 5))

# Use lag() to create a new column that retains the previous value
df <- df %>%
  mutate(previous_value = lag(value))

# Output the updated data frame
df

This will give you the following output:

  value previous_value
1     1             NA
2     2              1
3     3              2
4     4              3
5     5              4

As you can see, the previous_value column retains the value from the previous record. The first record has an NA value since there is no previous record