New var

On 3 Jun 2017, at 07:13 , Bert Gunter <bgunter.4567 at gmail.com> wrote:

Ii is difficult to provide useful help, because you have failed to
read and follow the posting guide. In particular:

1. Plain text, not HTML.
2. Use dput() or provide code to create your example. Text printouts
such as that which you gave require some work to wrangle into into an
example that we can test.

Specifically:

3. Have you gone through any R tutorials?-- it sure doesn't look like
it. We do expect some effort to learn R before posting.

4. What is the format of your date columns? character, factors,
POSIX,...? See ?date-time for details. Note particularly the
"difftime" link to obtain intervals.

5. ?ifelse  for vectorized conditionals.

Also, you might want to explain the context of what you are trying to
do. I strongly suspect you shouldn't be doing it at all, but that is
just a guess.

Be sure to cc your reply to the list, not just to me.

Cheers,
Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Fri, Jun 2, 2017 at 8:49 PM, Val <valkremk at gmail.com> wrote:

Hi all,

I have a data set with time interval and depending on the interval I want
to create 5 more variables . Sample data below

obs,   Start,   End
1,2/1/2015,  1/1/2017
2,4/11/2010, 1/1/2011
3,1/4/2006,  5/3/2007
4,10/1/2007, 1/1/2008
5,6/1/2011,  1/1/2012
6,10/15/2004,12/1/2004

First, I want get  interval between the start date and end dates
(End-start).

obs,  Start , end, datediff
1,2/1/2015,  1/1/2017, 700
2,4/11/2010, 1/1/2011, 265
3,1/4/2006,  5/3/2007, 484
4,10/1/2007, 1/1/2008, 92
5,6/1/2011,  1/1/2012, 214
6,10/15/2004,12/1/2004,47

Second. I want create 5 more variables  t1, t2, t3, t4 and  t5
The value of each variable is defined as follows
if datediff <   100 then  t1=1,  t2=t3=t4=t5=-1.
if datediff >= 100 and  < 200 then  t1=0, t2=1,t3=t4=t5=-1,
if datediff >= 200 and  < 300 then  t1=0, t2=0,t3=1,t4=t5=-1,
if datediff >= 300 and  < 400 then  t1=0, t2=0,t3=0,t4=1,t5=-1,
if datediff >= 400 and  < 500 then  t1=0, t2=0,t3=0,t4=0,t5=1,
if datediff >= 500 then  t1=0, t2=0,t3=0,t4=0,t5=0

The complete out put looks like as follow.
obs, start,         end,    datediff,   t1, t2, t3, t4, t5
1,    2/1/2015,   1/1/2017,    700, 0,  0,  0,  0,  0
2,  4/11/2010,   1/1/2011,    265, 0,  0,  1, -1,  -1
3,    1/4/2006,   5/3/2007,    484, 0,  0,  0, 0,   1
4,   10/1/2007,  1/1/2008,      92, 1, -1, -1,-1,  -1
5 ,    6/1/2011,    1/1/2012,  214,  0,  0,  1,-1,  -1
6, 10/15/2004, 12/1/2004,     47, 1, -1, -1, -1, -1

Thank you.

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