Stata tip 2: Building with floors and ceilings.
Xline stata date format how to#
There is a choice in there of 500 as a suitable step size subject-matter knowledge will often make that choice easy, or ambitious readers may wish to think how to automate a choice.Ĭox, N. Description These functions convert dates and times recorded as strings to Stata dates. See Cox (2003) for more on building with floors and ceilings. Here we change the format of the date to be month and day. Conversely, the call to floor() rounds to the nearest multiple of 500, but always to the same value or downwards. Place ticks and date labels at each month from 1999m1 to 2000m6 on thexaxis graph command : : :,: : : tlabel(1999m1(1)2000m6) Add a tick and the label Special value at 12.4 on thexaxis graph command : : :,: : : xlabel(12. We can change the format of the display of the date variable using the format () option where we can supply in valid format that we would supply using the format command. Weight | 74 3019.459 777.1936 1760 4840The call to ceil() (think 'ceiling' if the function is new to you) rounds to the nearest multiple of 500, but always to the same value or upwards.
Line M S ddate, xla(`ymid', tlength(*3) tlc(none)) xtic(`yend', tlength(*5)) xmla(`qmids', tlc(none) labsize(small) tlength(*.-+.
With your data, showing years is sensible but showing months too is likely to produce crowded detail that is hard to read and not much use.
SeeD Datetimefor anintroduction to Stata’s date and time features. Stata dates are numbersthat can be formatted so that they look like the dates you are familiar with. None are shown here, but the syntax is just an extension of that given.Īxis titles If the time (usually x) axis is adequately explained, that axis title is redundant and even dopey if it is some arbitrary variable name. Description These functions convert dates and times recorded as strings to Stata dates. Hi Stata users, I want to make a twoway bar graph that plots a number (on the y axis) against a date (on the x axis). Grid lines Lines demarcating years could be worth adding. Ticks Put ticks as the ends (equivalently beginnings) of time intervals. You can suppress a tick by setting its length to zero or its colour to invisible. Labels Put informative labels in the middle of time intervals. The main ideas are blindingly obvious once spelled out: It's a little bit of work but no more than use of standard and documented label and tick options. I can't run it in a loop where the xscale might change. However, the width is super non-systematized. Case 1) is a bit frustrating, as I've been using xline (c, width (20) color (gray)), where c is the midpoint between my two xlines (at x a and x b respectively. The good news is that you need just to build on what you have and put labels and ticks on your x axis. where I have one xline and I just want to shade between that line and the y-axis. See much detailed discussion at references turned up by search week, sj. You are lucky that you have no 53 week years in your data otherwise you would get some bizarre results. These are documented rules, and they do not match your data. Later weeks start 7 days later in turn, except that week 52 is always 8 or 9 days long. You should only use Stata's weekly date functions if your weeks satisfy Stata's rules: The fact that you have weekly data is only a distraction here.
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