Hi R Users,
I'm wondering how can I calculate two (or three) way sum of a variable. A
sample data is:
State Month Year Value
NC Jan 1996 1
NC Jan 1996 2
NC Feb 1997 2
NC Feb 1997 3
NC Mar 1998 3
NC Mar 1998 4
NY Jan 1996 4
NY Jan 1996 5
NY Feb 1997 5
NY Feb 1997 6
NY Mar 1998 6
NY Mar 1998 7
To: r-help@r-project.org
Subject: [R] Two-way/Three-way sum.
Hi R Users,
I'm wondering how can I calculate two (or three) way sum of a variable.
A
sample data is:
State Month Year Value
NC Jan 1996 1
NC Jan 1996 2
NC Feb 1997 2
NC Feb 1997 3
NC Mar 1998 3
NC Mar 1998 4
NY Jan 1996
try this:
x
State Month Year Value
1 NC Jan 1996 1
2 NC Jan 1996 2
3 NC Feb 1997 2
4 NC Feb 1997 3
5 NC Mar 1998 3
6 NC Mar 1998 4
7 NY Jan 1996 4
8 NY Jan 1996 5
9 NY Feb 1997 5
10NY Feb 1997
Hi Peng,
Here is a suggestion using tapply:
R with(x, tapply(Value, list(State, Month), FUN = sum))
R with(x, tapply(Value, list(State, Year), FUN = sum))
R with(x, tapply(Value, list(State, Year, Month), FUN = sum))
with 'x' your data set. Please take a look at ?tapply for more information.
Thanks Greg, Jorge, and Jim for your help.
Peng
On Thu, Dec 3, 2009 at 1:58 PM, jim holtman jholt...@gmail.com wrote:
try this:
x
State Month Year Value
1 NC Jan 1996 1
2 NC Jan 1996 2
3 NC Feb 1997 2
4 NC Feb 1997 3
5 NC Mar 1998 3
On Dec 3, 2009, at 1:50 PM, Peng Cai wrote:
Hi R Users,
I'm wondering how can I calculate two (or three) way sum of a
variable. A
sample data is:
State Month Year Value
NC Jan 1996 1
NC Jan 1996 2
NC Feb 1997 2
NC Feb 1997 3
NC Mar 1998 3
NC Mar 1998 4
NY Jan 1996 4
NY Jan 1996 5
NY Feb
Thanks David for your suggestions.
On Thu, Dec 3, 2009 at 2:03 PM, David Winsemius dwinsem...@comcast.netwrote:
On Dec 3, 2009, at 1:50 PM, Peng Cai wrote:
Hi R Users,
I'm wondering how can I calculate two (or three) way sum of a variable. A
sample data is:
State Month Year Value
NC
Also, can I control for number of decimal places printed. Like when I use
mean function. By default it shows upto 7 dec. Thanks!
On Thu, Dec 3, 2009 at 2:08 PM, Peng Cai pengcaimaill...@gmail.com wrote:
Thanks David for your suggestions.
On Thu, Dec 3, 2009 at 2:03 PM, David Winsemius
On Dec 3, 2009, at 2:14 PM, Peng Cai wrote:
Also, can I control for number of decimal places printed. Like when
I use mean function. By default it shows upto 7 dec. Thanks!
print(4.567891234, digits=3)
[1] 4.57
On Thu, Dec 3, 2009 at 2:08 PM, Peng Cai pengcaimaill...@gmail.com
Thanks again!
On Thu, Dec 3, 2009 at 2:19 PM, David Winsemius dwinsem...@comcast.netwrote:
On Dec 3, 2009, at 2:14 PM, Peng Cai wrote:
Also, can I control for number of decimal places printed. Like when I use
mean function. By default it shows upto 7 dec. Thanks!
print(4.567891234,
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