Displaying 5 results from an estimated 5 matches for "birte_2".
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birte
2009 Nov 25
2
difference of two rows
Dear R user,
I'd like to calculate the difference of two rows, where "ID" is the same.
eg.: I've got the following dataframe:
ID YEAR
13 2007
15 2003
15 2006
15 2008
21 2006
21 2007
and I'd like to get the difference, like this:
ID YEAR diff
13 2007 NA
15 2003 3
15 2006 2
15 2008 NA
21 2006 1
21 2007 NA
that should be fairly
2009 Oct 21
1
re ferring to data of previous rows
Dear Rlers,
in the following dataset I would like to insert a new column that refers to
the data of the previous row.
My question is whether the probability of a female (Id) changes if she had
given birth to a pup in the previous year. So my dataframe consists of the
column Id, year (2003-2007 for each Id) and offspring (=of; 1-0):
Id year of
1 2003 1
1 2004 0
1
2009 Feb 09
2
length of object in repeated measures
Hi there.
I collectad data of several animals (Id) that were caught and measured at
several occasions.
The dataframe looks like this:
Grouped Data: mass ~ age | Id
Id age mass
1 1 5.4
1 3 6.2
1 15 10.0
2 3 8.1
2 10 12.8
3 2 5.9
3 10 7.1
3 15 15.4
3 17
2009 Feb 20
3
mean over previous cells
Dear RUsers,
I guess this is an easy question for someone a little familiar with
programming...(which I am not)...
I've got 2 colummns, one shows just dates(SST_date, Class 'Date' num), the
other one shows the SeaSurfaceTemperature (SST, num) at that certain date.
SST_date SST
2008-01-01 22.2
2008-01-02 21.8
2008-01-03 22.8
2008-01-04 22.9
2008-01-05 23.1
2008-01-06 23.2
...
2009 Feb 23
1
"autonumber" for grouping variable
Dear R users,
my dataframe looks like this
head(dat)
Id sex byear age
1 300 m 2003 50
2 300 m 2003 36
3 402 f 2003 29
4 402 f 2003 21
5 402 f 2003 64
6 150 m 2005 43
...
...(where Id is just the Identification number of Individual, sex (male or
female), byear (=birthyear))
now, I 'd like to add a column, where each Individual gets an automated
number starting