[R] query about counting rows of a dataframe

[Stefano Sofia]

Dear R users,
I have got the following data frame, called my_df:

   gender day_birth month_birth year_birth labour
1           F             22                  10           2001          1
2           M            29                  10           2001          2
3           M              1                   11          2001          1
4           F               3                  11           2001          1
5           M              3                  11           2001          2
6           F              4                   11           2001          1
7           F              4                   11           2001          2
8           F              5                   12           2001          2
9           M           22                   14           2001          2
10         F           29                   13           2001          2
...

I need to count data in different ways:

1. count the births for each day (having 0 when necessary) independently from the value of the "labour" column

2. count the births for each day (having 0 when necessary), divided by the value of "labour" (which can have two valuers, 1 or 2)

3. count the births for each day of all the years (i.e. the 22nd of October of all the years present in the data frame) independently from the value of "labour"

4. count the births for each day of all the years (i.e. the 22nd of October of all the years present in the data frame), divided by the value of "labour"

I tried with the command

table(my_df$year_birth, my_df$month_birth, my_df$day_birth)

which satisfies (partially) question numer 1 (I am not able to have 0 in the not available days).

Is there a smart way to do that without invoking too many loops?

thank you for your help
Stefano Sofia


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