Legend on histogram

[Daniel Morales]

I made this command as a test

histogram x, normal kdensity freq xaxis(1 2) title("Prueba") ///
note("Fuente: INEI") ///
subtitle("Prueba de código") ///
xtitle("sss", axis(2)) ///
legend(label(1 "a" 2 "q" 3 "r" )

everything is ok but it does not show the legend.

[Nick Cox]

We can't see the graph or any of your data.

Certainly, you need an extra parenthesis for that to run.

Here is a reproducible fake

sysuse auto, clear
clonevar x = mpg 

histogram x, normal kdensity freq xaxis(1 2) title("Prueba") ///
note("Fuente: INEI") ///
subtitle("Prueba de código") ///
xtitle("sss", axis(2)) ///
legend(label(1 "a" 2 "q" 3 "r" ))

So far as twoway is concerned you are showing one variable, the frequency distribution, so there is no need for a legend.

What do you think a q r correspond to?

[Daniel Morales]

hi Mr. Cox, my code is this

set obs 500
generate x = rnormal(4,2)
generate y = 1.25 + 5*x + rnormal(0,1)
histogram x, xaxis(1 2) freq normal kdensity title("Prueba") ///
note("Fuente: INEI") ///
subtitle("Prueba de código") ///
xtitle("sss", axis(2)) ///
legend(label(1 "x" 2 "normal" 3 "kdensity") position(6))

this is the result, as you see, inside are the histogram of x, the normal curve and kdensity, I wanted a legend with those elements inside.

[Nick Cox]

I was wrong: histogram switches the legend off and you need to reverse that.

clear 
set obs 500
set scheme s1color 
generate x = rnormal(4,2)
generate y = 1.25 + 5*x + rnormal(0,1)


histogram x, xaxis(1 2) freq normal kdensity title("Prueba") ///
note("Fuente: INEI") ///
subtitle("Prueba de código") ///
xtitle("sss", axis(2)) ///
normopts(lc(red)) kdenopts(lc(blue)) /// 
legend(on order(1 2 "kdensity" 3 "normal") row(1) position(6))

[Daniel Morales]

thank you Mr. Cox