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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 16:28:10 -0800 (PST) |

Hi Eric, Nothing works, probably it was my fault. Below is the full description of my data set: var1 = serial number (1 - 2783 records) var2 = date/day of sampling (1st Jan - 31 Dec for each of the 7 ponds) var3 = total mortality recorded daily (count) var4 = present total number of fish in the pond (count) var5 = pond number (1 - 7) I am interested in plotting a single line-graph showing a trend of monthly mortality by pond number (var5). Hope this one is clear and apologies for my previous vague description. Aminu. ----- Original Message ----- From: Eric Booth <eric.a.booth@gmail.com> To: statalist@hsphsun2.harvard.edu Cc: Sent: Saturday, March 10, 2012 9:57:40 PM Subject: Re: st: Converting count to dichotomous variable On Mar 10, 2012, at 3:05 PM, Shittu, Aminu wrote: > > Is it possible to force them in a single graph with 7 lines each for a pond, showing monthly totals? Building on the previous 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* by var3: g day = _n *---create fake month var: by var3: g month = int(runiform()*12+1) loc i = 1 foreach m in `c(Mons)' { loc l `l' `i' `"`m'"' loc i `++i' } //label.months lab def jj `l', modify lab val month jj ta month //use your real month data for real day counts *---graph: monthly totals for each pond (var3) *--1. create monthly totals of mortalities(var1) bys month var3: egen mt_var1 = total(var1) lab var mt_var1 "monthly total mortalities for each pond" bys month: egen mt_var2 = total(var1) lab var mt_var2 "monthly total mortalities for ALL ponds" lab var var3 "Pond" *--2. graphs **graph macro for options: loc opts `"name(g1, replace) xtitle(Month) xlabel(#12, labels labsize(small) angle(forty_five) valuelabel) title(Mortalities Totals each Month) scheme(sj) xsize(10) ysize(6)"' //watch for wrapping!! **a. Overall Totals twoway (line mt_var2 month, /// sort cmissing(y)), /// subtitle({bf:All Ponds}) `opts' graph save g1 `"overall.gph"', replace **b. by Pond *-build graph command: levelsof var3, loc(ponds) foreach x in `ponds' { loc p `" `p' (line mt_var1 month if var3 == `x') "' loc leg `" `leg' `x' `"Pond `x'"' "' } //line for each pond di `"`leg'"' twoway `p', legend(on order(`"`leg'"') size(vsmall)) /// subtitle({bf:By Ponds}) `opts' graph save g1 `"ByPond.gph"', replace ***************! - Eric __ Eric A. Booth Public Policy Research Institute Texas A&M University ebooth@ppri.tamu.edu +979.845.6754 On Mar 10, 2012, at 3:05 PM, Shittu, Aminu wrote: > 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/ * * 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>

**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>

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

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

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