Histogram - line only

[Klemen Spen]

Hello everybody,

I would like to create histogram in Stata, but instead of columns I would like to draw line that represents frequency distribution of variable. I hope you understand my question and know solution to my problem.

Thank you.

[David Radwin]

I expressed the same wish (I think) a few years ago, but it's not possible at this point. Please see http://www.stata.com/statalist/archi.../msg01137.html .

[Svend Juul]

Is this what you want?

sysuse auto, clear
gen weightgrp = 500*floor(weight/500) + 250
gen n=1
collapse (sum) n , by(weightgrp)
twoway line n weightgrp , sort xlabel(1500(500)5000)

[Nick Cox]

Svend has some neat code that will give you a first stab. The problem gets worse if you have empty bins, which by definition will be not in the reduced dataset. You will get an incorrect connection between positive frequencies either side of the bin that is empty.

[Phil Clayton]

This may not be what you want, but you can use kdensity to achieve a similar effect:

sysuse auto, clear
kdensity weight

[David Radwin]

In my opinion, your best bet for overlapping histograms is to make one histogram with a solid outline and transparent fill (color(none)) and the other histogram with a washed-out color, like this:

sysuse nlsw88
twoway (histogram wage if union==1, frequency color(gs11) lwidth(none)) ///
       (histogram wage if union==0, frequency color(none) lwidth(medium) lcolor(navy) ///
       legend(order(2 "Non-union" 1 "Union")))

[David Radwin]

Also see http://www.statalist.org/forums/foru...963#post821963 .