Hello,

I use Stata 14.2. I am working on a cross-sectional dataset.
I have used the command mofd to generate a month/year variable (which I called mydi) from a date variable (which I called dadis).
When I tabulate the variable mofd, the categories shown (apr16 sep17 apr16 sep17) are correct. So far so good.
The problem comes when I use the command twoway connected with the variable mydi. In the graph, the label for
sep16 and sep17 showns oct16 and oct17 instead... Can you advice please?

I am copying below an example of my dataset (including only relevant variables) a description of the variables, and the commands I use.


Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input int id float ty int dadis float(mydi vol)
 69 1 20565 675  6
 45 1 20558 675  6
 49 1 20558 675  6
 44 1 20558 675  6
110 1 20572 675  6
 74 1 20565 675  6
 90 2 20572 675 39
112 2 20572 675 39
 34 2 20558 675 39
 18 2 20551 675 39
 16 2 20551 675 39
 65 2 20565 675 39
 64 2 20565 675 39
 88 2 20565 675 39
 78 2 20565 675 39
 66 2 20565 675 39
 99 2 20572 675 39
 12 2 20551 675 39
 98 2 20572 675 39
  6 2 20551 675 39
 96 2 20572 675 39
 32 2 20558 675 39
 38 2 20558 675 39
 17 2 20551 675 39
106 2 20572 675 39
 50 2 20558 675 39
 31 2 20551 675 39
 60 2 20565 675 39
 62 2 20565 675 39
 92 2 20572 675 39
 93 2 20572 675 39
 73 2 20565 675 39
 94 2 20572 675 39
 77 2 20565 675 39
  4 2 20551 675 39
113 2 20572 675 39
 47 2 20558 675 39
 61 2 20565 675 39
109 2 20572 675 39
 89 2 20572 675 39
 46 2 20558 675 39
 76 2 20565 675 39
 97 2 20572 675 39
 39 2 20558 675 39
 51 2 20558 675 39
 22 3 20551 675  8
 37 3 20558 675  8
 63 3 20565 675  8
 20 3 20551 675  8
 33 3 20558 675  8
 57 3 20558 675  8
 52 3 20558 675  8
100 3 20572 675  8
 15 4 20551 675  7
107 4 20572 675  7
 43 4 20558 675  7
 10 4 20551 675  7
 72 4 20565 675  7
 36 4 20558 675  7
102 4 20572 675  7
 48 5 20558 675  1
345 1 20712 680 14
382 1 20719 680 14
413 1 20726 680 14
371 1 20719 680 14
268 1 20698 680 14
349 1 20712 680 14
415 1 20726 680 14
412 1 20726 680 14
347 1 20712 680 14
328 1 20712 680 14
353 1 20712 680 14
299 1 20705 680 14
401 1 20726 680 14
279 1 20698 680 14
264 2 20698 680 35
341 2 20712 680 35
322 2 20712 680 35
265 2 20698 680 35
350 2 20712 680 35
335 2 20712 680 35
359 2 20719 680 35
411 2 20726 680 35
295 2 20705 680 35
334 2 20712 680 35
396 2 20726 680 35
270 2 20698 680 35
302 2 20705 680 35
402 2 20726 680 35
269 2 20698 680 35
348 2 20712 680 35
296 2 20705 680 35
261 2 20698 680 35
267 2 20698 680 35
277 2 20698 680 35
293 2 20705 680 35
408 2 20726 680 35
324 2 20712 680 35
393 2 20726 680 35
263 2 20698 680 35
260 2 20698 680 35
278 2 20698 680 35
340 2 20712 680 35
325 2 20712 680 35
316 2 20705 680 35
351 2 20712 680 35
391 2 20726 680 35
317 2 20705 680 35
369 2 20719 680 35
318 2 20705 680 35
271 3 20698 680  4
399 3 20726 680  4
383 3 20719 680  4
395 3 20726 680  4
365 4 20719 680  8
379 4 20719 680  8
306 4 20705 680  8
404 4 20726 680  8
378 4 20719 680  8
280 4 20698 680  8
376 4 20719 680  8
374 4 20719 680  8
392 5 20726 680  1
141 1 20915 687 34
175 1 20922 687 34
131 1 20915 687 34
133 1 20915 687 34
246 1 20936 687 34
218 1 20929 687 34
188 1 20922 687 34
244 1 20936 687 34
258 1 20936 687 34
242 1 20936 687 34
134 1 20915 687 34
139 1 20915 687 34
248 1 20936 687 34
204 1 20929 687 34
216 1 20929 687 34
185 1 20922 687 34
206 1 20929 687 34
198 1 20929 687 34
137 1 20915 687 34
250 1 20936 687 34
136 1 20915 687 34
190 1 20922 687 34
135 1 20915 687 34
167 1 20922 687 34
172 1 20922 687 34
217 1 20929 687 34
177 1 20922 687 34
129 1 20915 687 34
150 1 20915 687 34
138 1 20915 687 34
184 1 20922 687 34
247 1 20936 687 34
168 1 20922 687 34
214 1 20929 687 34
163 2 20915 687 14
199 2 20929 687 14
182 2 20922 687 14
233 2 20936 687 14
153 2 20915 687 14
125 2 20915 687 14
161 2 20915 687 14
197 2 20929 687 14
213 2 20929 687 14
236 2 20936 687 14
257 2 20936 687 14
189 2 20922 687 14
170 2 20922 687 14
205 2 20929 687 14
249 3 20936 687  5
162 3 20915 687  5
237 3 20936 687  5
240 3 20936 687  5
140 3 20915 687  5
241 4 20936 687 15
234 4 20936 687 15
201 4 20929 687 15
149 4 20915 687 15
187 4 20922 687 15
238 4 20936 687 15
158 4 20915 687 15
229 4 20936 687 15
179 4 20922 687 15
252 4 20936 687 15
200 4 20929 687 15
183 4 20922 687 15
243 4 20936 687 15
147 4 20915 687 15
144 4 20915 687 15
245 5 20936 687  4
160 5 20915 687  4
148 5 20915 687  4
164 5 20915 687  4
473 1 21076 692 29
449 1 21069 692 29
493 1 21076 692 29
427 1 21069 692 29
460 1 21069 692 29
513 1 21083 692 29
437 1 21069 692 29
530 1 21090 692 29
545 1 21090 692 29
482 1 21076 692 29
546 1 21090 692 29
448 1 21069 692 29
516 1 21083 692 29
514 1 21083 692 29
536 1 21090 692 29
547 1 21090 692 29
481 1 21076 692 29
535 1 21090 692 29
531 1 21090 692 29
471 1 21076 692 29
466 1 21069 692 29
452 1 21069 692 29
458 1 21069 692 29
446 1 21069 692 29
483 1 21076 692 29
423 1 21069 692 29
475 1 21076 692 29
544 1 21090 692 29
426 1 21069 692 29
424 2 21069 692  6
476 2 21076 692  6
541 2 21090 692  6
440 2 21069 692  6
533 2 21090 692  6
539 2 21090 692  6
478 3 21076 692  3
447 3 21069 692  3
445 3 21069 692  3
474 4 21076 692 11
484 4 21076 692 11
500 4 21076 692 11
442 4 21069 692 11
465 4 21069 692 11
517 4 21083 692 11
429 4 21069 692 11
518 4 21083 692 11
453 4 21069 692 11
456 4 21069 692 11
461 4 21069 692 11
511 5 21083 692  4
534 5 21090 692  4
527 5 21083 692  4
464 5 21069 692  4
end

format dadis %tdDDmonCCYY
format mydi %tmmonCCYY
label values ty tyla
label def tyla 1 "Electronic", modify
label def tyla 2 "Paper proforma", modify
label def tyla 3 "Paper letter", modify
label def tyla 4 "Internal", modify
label def tyla 5 "NeurosorUnk", modify



Code:
* Twoway connected graph
    twoway connected vol mydi if ty==1, sort msize(zero) mcolor(navy) lcolor(navy) lwidth(medthick) ||  ///
        connected vol mydi if ty==2, sort msize(zero) mcolor(dkorange) lcolor(dkorange) lwidth(medthick) lpattern(longdash) ||  ///
        connected vol mydi if ty==3, sort msize(zero) mcolor(dkorange) lcolor(dkorange) lwidth(medthick) lpattern(shortdash_dot) ||  ///
        connected vol mydi if ty==4, sort msize(zero) mcolor(dkgreen) lcolor(dkgreen) lwidth(medthick) lpattern(dot)  ///
        ylabel(0(10)40, labsize(6) angle(zero))  ///
        tlabel(, labsize(6) )  ///
        xtitle("Month-Year", margin(medium) size(6))  ///
        ytitle("Number of referrals", size(6) margin(medium) )  ///
        title("Number of referrals per month and year", c(black) size(6) margin(small) )  ///
        ylabel(, labsize(6) nogrid)  ///
        ysize(3) xsize(8)  ///
        graphregion(fcolor(white) lcolor(white) margin(medlarge))  ///
        plotregion(fcolor(white) lcolor(white) margin(medlarge))  ///
        legend(size(6) order (1 "Electronic" 2 "Paper proforma" 3 "Paper letter" 4 "Internal")  ///
        symxsize(9) symysize(3) margin(small) col(1) pos(3) region(lcolor(white)) span)