Question to info at Epidata:

I have two successive periods: 1 and 2 I wish a graph where the first 6 observations in each period are included and on the graph the x axis should say 1 2 3 4 5 6 in both of them

Using the Ichart.rec example included in installation of EpiData Analysis:

file: ichart.rec which has 27 observations variables: lege : counts for a given doctor (lege is doctor in Norwegian) dag : consecutive number of observations (values are 1 - 27)

Assume that period 1 in the study was observation 1-14 and observation 15-27 was period 2.

Read the data en calculate as indicated after the "//" is comments ................................................................................................ read ichart define d ## d = _n // _n is the same as recnumber the observation number of the data if d > 15 then d = d -15 // now d is the correct number withing each period select if d < 7 // only include first 6 observations from each period ichart dag lege // this would show x axis with values of variable dag ichart dag lege /break=7 /xlabel=d // this would make a break for the two periods and use d as label ................................................................................................

Similarly for date variables: ................................................................................................ ichart tid lege /break="01/01/2003" /xlabel=d // if the value of "tid" was "01/01/2003" for observation 7 ................................................................................................ The format of the break value should for dates be the same as the x axis variable. The graph above will show a gap btw. the two periods since the x-axis variable has values from 1 to 27

If one has consecutive numbers e.g. 1-12 and you wish to have larger separation of the two periods: ................................................................................................ define d1 ## d1 = _n if d1 > 6 then d1 = d1+2 // experiment a bit if you wish 1, 2 or more added ichart d1 lege /break=7 /xlabel=d // this would move the two parts of the graph apart ................................................................................................ Regards Jens Lauritsen EpiData Association ps. Unfortunately the /xlabel option is not in the current commands and functions reference. Will be added to next release.