Color of bar graph

[Kevin Dan]

Dear all,

I want to create a bar graph with some conditions below:

• there is no space between the bars
• all bars have the same color
• there is no box for the x-title.

Unfortunately, I cannot find a solution. I use the below command but it gives me the figure attached. Could anyone know the solution? Many thanks for considering my request.


clear
input y x
1 1 1
2 2 2
3 4 3
4 6 4
5 9 5
6 10 6
7 11 10
end

graph bar (asis) y, over(x) asyvars

[Chen Samulsion]

graph bar (asis) y, over(x)

And are you sure you want that there is no space between the bars?

[Kevin Dan]

Hi,

No, I do not want any space between the bars. I want the bars just next to each other like in the graph but with the same color.

[Chen Samulsion]

graph bar (asis) y, over(x, gap(0))

[Kevin Dan]

graph bar (asis) y, over(x, gap(0))

many thanks for your help. It works perfectly. I have another question would like to ask. Assume that I have another variable name z. I want to adjust the width of each bar based on the corresponding z value. I would like to ask if you have any suggestions for this. Thank you again.

[Chen Samulsion]

Hi, the bar width could be adjusted by setting option of over(varname, gap([*]#) or bargap(#). However, you'd better provide data example like #1, that will help users to answer your question.

[Kevin Dan]

Hi, the bar width could be adjusted by setting option of over(varname, gap([*]#) or bargap(#). However, you'd better provide data example like #1, that will help users to answer your question.

many thanks for your quick answer. Below is the example:

clear
input y x z
1 1 1 2
2 2 2 4
3 4 3 5
4 6 4 7
5 9 5 8
6 10 6 1
7 11 10 3
end

I want to produce the same graph as before with the only difference being that the width of each bar will equal the value of z, for example, if the first bar will have a width =1, then the second bar will have a width = 4/2*1, the third bar have a width = 5/2*1 ...

[Chen Samulsion]

I don't quite follow your question. Why set bar gap according to value of z? But you can try this:

clear
input id y x z
1 1 1 2
2 2 2 4
3 4 3 5
4 6 4 7
5 9 5 8
6 10 6 1
7 11 10 3
end
preserve
expand z
bysort id: gen nobs=_n
replace y=. if nobs!=1
gen n=_n
graph bar (asis) y, over(n) name(bar1)
graph bar (asis) y, over(n, label(nolabels)) name(bar2)
restore

[Kevin Dan]

I don't quite follow your question. Why set bar gap according to value of z? But you can try this:

clear
input id y x z
1 1 1 2
2 2 2 4
3 4 3 5
4 6 4 7
5 9 5 8
6 10 6 1
7 11 10 3
end
preserve
expand z
bysort id: gen nobs=_n
replace y=. if nobs!=1
gen n=_n
graph bar (asis) y, over(n) name(bar1)
graph bar (asis) y, over(n, label(nolabels)) name(bar2)
restore

thanks a lot for your help. I will try your suggestion.

[Kevin Dan]

I don't quite follow your question. Why set bar gap according to value of z? But you can try this:

clear
input id y x z
1 1 1 2
2 2 2 4
3 4 3 5
4 6 4 7
5 9 5 8
6 10 6 1
7 11 10 3
end
preserve
expand z
bysort id: gen nobs=_n
replace y=. if nobs!=1
gen n=_n
graph bar (asis) y, over(n) name(bar1)
graph bar (asis) y, over(n, label(nolabels)) name(bar2)
restore

thanks a lot for your help. I will try your suggestion.

[Nick Cox]

See

. search spanning , sj

Search of official help files, FAQs, Examples, and Stata Journals

SJ-15-1 gr0063  . . . . . Stata tip 122: Variable bar widths in two-way graphs
        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  B. Jann
        Q1/15   SJ 15(1):316--318                                (no commands)
        highlights the bartype(spanning) option of the twoway bar
        command, an undocumented feature that can be used to produce
        bars of different widths

As the references in that Tip indicate, I use this about once every 5 years, so some of the details below may be redundant.

clear
input id y x z
1 1 1 2
2 2 2 4
3 4 3 5
4 6 4 7
5 9 5 8
6 10 6 1
7 11 10 3
end

local N = c(N)

insobs 1
replace id = 0 in L 
replace y = y[_n-1] in L 
replace z = 0 in L 
insobs 1, before(1)
replace y = y[2] in 1 

gen mid = sum(z) - 0.5 * z 
gen top = sum(z)
gen bot = top[_n-1]

forval j = 1/`N' {
    local call `call' `=mid[1 + `j']' "`=id[1 + `j']'"
}

di `"`call'"'

list 

twoway bar y bot, bartype(spanning) yla(#7, ang(h)) xla(`call', noticks) xtitle(id) fcolor(none)