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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

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

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

Date |
Sun, 9 Nov 2008 17:59:13 -0000 |

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/

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

**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>

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