topic Why Does SGPLOT Trim Some Observations Automatically? in Graphics Programming

Why Does SGPLOT Trim Some Observations Automatically?

Junyong — Thu, 21 Nov 2019 18:16:25 GMT

When I apply VALUES and VALUESFORMAT in XAXIS, SGPLOT automatically trims some trailing observations. The left uses a naked format so displays correctly, but the right uses YEAR10 in VALUES and YEAR4. in VALUESFORMAT so ends much earlier than the left. How can I avoid this problem?

Here's the code.

data have;
t=mdy(1,1,1900);
do until(year(t)>2018);
x+rannor(1);
output;
t=intnx("month",t,1);
end;
run;
ods listing gpath="!userprofile\desktop\";
ods graphics/reset imagename="out";
proc sgplot;
series x=t y=x;
run;
proc sgplot;
series x=t y=x;
xaxis values=("1jan1900"d to "1jan2019"d by year10) valuesformat=year4.;
run;
quit;

Thanks for your help.

Re: Why Does SGPLOT Trim Some Observations Automatically?

Reeza — Thu, 21 Nov 2019 18:48:53 GMT

Your interval is uneven, what happens if it ends at 2020, not 2019 as indicated in your specification?

xaxis values=("1jan1900"d to "1jan2019"d by year10) valuesformat=year4.;

My guess is because it's not a full interval it cuts off at the last 10 interval, instead of going past as the default behaviour.

From the documentation:

If the specified range is not evenly divisible by the increment value, the highest value displayed on the axis is the last incremental value below the ending value for the range. For example, this value list produces a maximum axis value of 9:

values=(0 to 10 by 3)

@Junyong wrote:

When I apply VALUES and VALUESFORMAT in XAXIS, SGPLOT automatically trims some trailing observations. The left uses a naked format so displays correctly, but the right uses YEAR10 in VALUES and YEAR4. in VALUESFORMAT so ends much earlier than the left. How can I avoid this problem?

Here's the code.
data have;
t=mdy(1,1,1900);
do until(year(t)>2018);
x+rannor(1);
output;
t=intnx("month",t,1);
end;
run;
ods listing gpath="!userprofile\desktop\";
ods graphics/reset imagename="out";
proc sgplot;
series x=t y=x;
run;
proc sgplot;
series x=t y=x;
xaxis values=("1jan1900"d to "1jan2019"d by year10) valuesformat=year4.;
run;
quit;
Thanks for your help.

Re: Why Does SGPLOT Trim Some Observations Automatically?

DanH_sas — Thu, 21 Nov 2019 18:56:40 GMT

Try adding the VALUESHINT option to the XAXIS. This should make the VALUES option place the ticks correctly without constraining the axis range.

Hope this helps!
Dan

Re: Why Does SGPLOT Trim Some Observations Automatically?

ballardw — Thu, 21 Nov 2019 21:50:03 GMT

Any values list will "trim the data" if the limits are less than the range of the values.

It is actually a useful feature as you can quickly modify the amount of data displayed as needed.

Such as

proc sgplot;
series x=t y=x;
xaxis values=(-1750 -600 0 380 1800);
run;