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From |
"Amanda Botticello" <abotticello@kmrrec.org> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: RE: Re: sum across observations until a certain cutpoint |

Date |
Sun, 09 Nov 2008 13:20:24 -0500 |

I want to calculate how many items each subject completed within 60 seconds. And I can't do anything about the data structure, unfortunately. Amanda L. Botticello, PhD, MPH Outcomes Research Scientist Kessler Medical Rehabilitation Research and Education Center Assistant Professor Department of Physical Medicine & Rehabilitation UMDNJ-New Jersey Medical School 1199 Pleasant Valley Way West Orange, NJ 07052 phone: (973)243-6973 email: abotticello@kmrrec.org >>> "Nick Cox" <n.j.cox@durham.ac.uk> 11/9/2008 1:14 PM >>> You've lost me. I don't understand how your data structure copes with time spent on failed tasks. Please be clear: Do you want to cumulate times and see how many tasks in total were completed within a total of 60 seconds, as implied by your original question, or do you just want to count how many tasks were individually completed within 60 seconds? Incidentally, I think you would be better off reshaping this to long. Nick n.j.cox@durham.ac.uk Amanda Botticello The data is more like this: id item1 time1 item2 time2 itmem3 time3 1 1 2 1 3 1 2 2 1 5 0 0 0 0 3 1 3 1 3 1 5 The variable "item" is coded 0,1, where 1 indicates the item was completed Time is recorded in number of seconds to complete. If they didn't complete an item, the time is 0 >>> "Nick Cox" <n.j.cox@durham.ac.uk> 11/9/2008 12:59 PM >>> Still not very clear to me, but I guess something like this task1 task2 task3 task4 task5 20 10 20 5 10 5 10 15 30 2 100 2 3 3 4 So that the three individuals above had completed 4, 4, 0 tasks in the first 60 seconds. How many within 60 seconds? gen cumul = 0 gen within60 = 0 qui forval i = 1/5 { replace cumul = cumul + task`i' replace within60 = `i' if cumul <= 60 } Nick n.j.cox@durham.ac.uk Amanda Botticello PhD, MPH IT's a "wide" dataset...subjects completed up to 200 items in a task, and we recorded the number of seconds it took to complete each item. I can create a sum of the total number of items completed and total time; now I want to find out how many items each individual completed in 60, 90, and 120 seconds. Does that help? >>> "Martin Weiss" <martin.weiss1@gmx.de> 11/9/2008 11:00 AM >>> Well, if you want the running sum, look at -help sum()-. But maybe you could give us a peek at your data structure, that would assist in answering your question... "Amanda Botticello" <abotticello@kmrrec.org> >I have a dataset of test items and the time (in seconds)to complete each >item. I need to create a variable that sums the time variables up to a >certain number -- i.e., 60, 90, 120 seconds. Is there a way I can use the >egen newvar = rowtot (time*) command to count up to 60 seconds, etc? * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ The information in this transmission is intended for official use of the Kessler Foundation. It is intended for the exclusive use of the persons or entities to which it is addressed. If you are not an intended recipient or the employee or agent responsible for delivering this transmission to an intended recipient, be aware that any disclosure, dissemination, distribution or copying of this communication, or the use of its contents, is strictly prohibited. If you received this transmission in error, please notify the sender by return e-mail and delete the material from any computer. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: RE: RE: Re: sum across observations until a certain cutpoint***From:*Steven Samuels <sjhsamuels@earthlink.net>

**st: RE: RE: RE: Re: sum across observations until a certaincutpoint***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**st: sum across observations until a certain cutpoint***From:*"Amanda Botticello" <abotticello@kmrrec.org>

**st: Re: sum across observations until a certain cutpoint***From:*"Martin Weiss" <martin.weiss1@gmx.de>

**st: Re: sum across observations until a certain cutpoint***From:*"Amanda Botticello" <abotticello@kmrrec.org>

**st: RE: Re: sum across observations until a certain cutpoint***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**st: RE: Re: sum across observations until a certain cutpoint***From:*"Amanda Botticello" <abotticello@kmrrec.org>

**st: RE: RE: Re: sum across observations until a certain cutpoint***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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