redjoc
October 28, 2019, 4:16pm
1
Hi Community,
I'm a long time SAS user and I'm trying R, so I'm very new.
I'm looking to create a new variables "Best date" based on a two variables Incident date and Date Report. Incident date and Date report as their name implies are dates of when a particular report came in. Best date in this case is when there is no incident date but a report date.
In SAS it would look like this:
Best date=.;
if Incident date < Date Report then Best date= Incident date;
else if Incident date = NA then Best date = Date Report; #NA in this case is an empty cell#
I"m not even know where to start. Should I mutate the two variables into the Best date variable using dpyly library?
Please help. Thanks.
Take a look at dplyr::coalesce
function. I think, it does what you want.
In R it would something like this:
your_dataset <- your_dataset %>%
dplyr::mutate(Best_date = dplyr::coalesce(Incident_date, Date_report))
1 Like
redjoc
October 28, 2019, 5:41pm
3
Thanks for the reply!
I entered the code you provided:
my_data_set < - my_data_set %>% dplyr::mutate( Best date = dplyr::coalesce(Incident date, Date report))
But unfortunately, I get this error:
Error: unexpected symbol in "my_data_set <- ERP %>% dplyr::mutate(Best date"
Notice that variables in R can't have spaces in them and that is why I have Best_date = ...
. It is possible to have spaces in the name of the columns/variables, but overall it's a recipe for disaster down the line, so it's better to stick to convention and use alphanumeric characters + _
.
redjoc
October 31, 2019, 3:22pm
5
Thanks for the reply.
So I did what you said
Copy_merge_dataset <- Copy_merge_dataset %>%
dplyr::mutate(Best_date = dplyr::coalesce("Incident_Date", "Date_Report_Submitted"))
and got this error:
Error in mutate_(.data, .dots = compat_as_lazy_dots(...)) :
argument ".data" is missing, with no default
It's difficult to say for sure what is going wrong without reprex. As you can see, it works for me:
library(dplyr)
#>
#> Attaching package: 'dplyr'
#> The following objects are masked from 'package:stats':
#>
#> filter, lag
#> The following objects are masked from 'package:base':
#>
#> intersect, setdiff, setequal, union
mtcars %>%
dplyr::mutate(Best_cyl = dplyr::coalesce(cyl, disp))
#> mpg cyl disp hp drat wt qsec vs am gear carb Best_cyl
#> 1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 6
#> 2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 6
#> 3 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 4
#> 4 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 6
#> 5 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 8
#> 6 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 6
#> 7 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 8
#> 8 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2 4
#> 9 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 4
#> 10 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 6
#> 11 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 6
#> 12 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 8
#> 13 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 8
#> 14 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3 8
#> 15 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4 8
#> 16 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4 8
#> 17 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 8
#> 18 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 4
#> 19 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 4
#> 20 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 4
#> 21 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1 4
#> 22 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2 8
#> 23 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 8
#> 24 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4 8
#> 25 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2 8
#> 26 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1 4
#> 27 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2 4
#> 28 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2 4
#> 29 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4 8
#> 30 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6 6
#> 31 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8 8
#> 32 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 4
Created on 2019-10-31 by the reprex package (v0.3.0)
Try not using quotes in your dplyr::coalesce
call.
1 Like
redjoc
November 1, 2019, 2:59pm
7
Hi!
I figured it out with this:
Merge_dataset$Best_Date
<- dplyr::coalesce(Merge_dataset$Incident_Date, Merge_dataset$Date_Report_Submitted)
Worked without a hitch. Thanks for all your help!
system
Closed
November 22, 2019, 2:59pm
8
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