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From |
"Shittu, Aminu" <ameen_vet@yahoo.com> |

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

Subject |
Re: st: Converting count to dichotomous variable |

Date |
Sat, 10 Mar 2012 13:05:44 -0800 (PST) |

Hi Eric and all, Thank you very much, it works perfectly! May I further ask on how I could plot a single line graph showing the total number of daily or monthly mortality totals in each of the 7 ponds? My hurdle is that mortality was recorded at least everyday for 365 days (365*7), say from 1st - 31st of January.....1st to 31st of December for each of the 7 ponds. If I am to work with the monthly record, I will have 30*12*7 or 31*12*7 rows/pond except for February which has 28 in this case. Is it possible to force them in a single graph with 7 lines each for a pond, showing monthly totals? Aminu. ________________________________ From: Eric Booth <eric.a.booth@gmail.com> To: statalist@hsphsun2.harvard.edu Sent: Friday, March 9, 2012 10:23:31 PM Subject: Re: st: Converting count to dichotomous variable <> Sorry, your mortalities were in var1, not var2, so the line: bys day: egen var4_b = max(var2) should have said: bys day: egen var4_b = max(var1) but the main point is the same. EAB __ Eric A. Booth Public Policy Research Institute Texas A&M University ebooth@ppri.tamu.edu Office: +979.845.6754 On Mar 9, 2012, at 3:57 PM, Eric Booth wrote: <> One strategy is to take the max number of mortalities (via -egen-) across all obs. in each day (or each pond/day -- I'm not sure which you need) and then recode anything greater than zero as a "1" indicating that mortalities occurred (leaving it as zero otherwise). Here a quick example: ***************! clear *--fake data set obs 7 g var3 = _n expand 365 sort var3 g var2 = int(30+runiform()*100) g var1 = int(runiform()*4) su var* **var4** *--daily mortality by var3: g day = _n *---1. for each pond/day g var4_a = 1 if var1 != 0 //no mortalities each pond/day replace var4_a = 0 if mi(var4_a) *---2. for each day only bys day: egen var4_b = max(var2) recode var4_b (1/max = 1) (0=0) su var4* ***************! - Eric __ Eric A. Booth Public Policy Research Institute Texas A&M University ebooth@ppri.tamu.edu Office: +979.845.6754 On Mar 9, 2012, at 3:30 PM, Aminu Shittu wrote: Dear Statalisters, I have var1 in my data set which represents number of death in a fish pond and var2 representing the existing number. The daily mortality was recorded in 7 fish ponds (var3) for a period of 1 year (365x7 rows). I am interested in creating a dichotomous var4, to indicate whether a daily mortality had occurred or not, without taking number of counts into consideration. Is it possible to do this in Stata or Excel? Aminu. * * 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/ * * 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/ * * 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: Converting count to dichotomous variable***From:*Eric Booth <eric.a.booth@gmail.com>

**st: Multilevel Tobit model***From:*"Mccoach, D. Betsy" <betsy.mccoach@uconn.edu>

**References**:**st: Converting count to dichotomous variable***From:*Aminu Shittu <ameen_vet@yahoo.com>

**Re: st: Converting count to dichotomous variable***From:*Eric Booth <eric.a.booth@gmail.com>

**Re: st: Converting count to dichotomous variable***From:*Eric Booth <eric.a.booth@gmail.com>

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