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From |
Austin Nichols <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: overlaying two histograms (or distribution curves) |

Date |
Fri, 20 Nov 2009 10:47:06 -0500 |

Maarten-- I think that is the same graph I gave for comparison purposes, but I don't think it compares well with -byhist- unless one takes a bit more care on the -kdensity- side--the kernel density estimates should at least use the same bandwidths, and perhaps the same estimation points if we really wish to compare them. Other considerations might apply if Ariel told us something about the theoretical distribution of the variable filling the role of "price" (is it discrete? does it have a finite range?). clear all sysuse auto ren foreign f byhist price, by(f) name(b) tw(leg(col(1))) loc l leg(lab(1 "Domestic") lab(2 "Foreign") col(1)) xti(Price) tw kdensity price if !f, bw(900)||kdensity price if f, name(k) bw(900) `l' gr combine k b, nocopies name(compar) tw kdensity price if !f, bw(600)||kdensity price if f, bw(600) `l' gr combine k Graph, nocopies name(compark) kdensity price, nogr gen(x pdf) loc b=r(bwidth) kdensity price if !f, nogr bw(`b') gen(f0) at(x) kdensity price if f, nogr bw(`b') gen(f1) at(x) line f0 f1 x g df=f1-f0 kdensity price if !f, nogr bw(900) gen(g0) at(x) kdensity price if f, nogr bw(900) gen(g1) at(x) line g0 g1 x, name(c9) g dg=g1-g0 line df dg x, name(diffdpf) Try also: ssc inst vioplot, replace vioplot price, over(f) horiz On Fri, Nov 20, 2009 at 10:09 AM, Maarten buis <maartenbuis@yahoo.co.uk> wrote: > --- On Fri, 20/11/09, Ariel Linden, DrPH wrote: >> Is there a way to overlay one histogram (or just the >> density curve)over another so that they align accordingly > > *------------- begin example --------------- > sysuse auto, clear > twoway kdensity price if foreign ==0 || /// > kdensity price if foreign == 1 > *-------------- end example ---------------- > * * 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/

**References**:**st: overlaying two histograms (or distribution curves)***From:*"Ariel Linden, DrPH" <alinden@lindenconsulting.org>

**Re: st: overlaying two histograms (or distribution curves)***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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