I am trying to randomly select a survey schedule that includes both weekend days and two consecutive weekdays over a 34 week period. I have created a data set that has all combinations of the variables (example below) with a total of 532 possibilities:
Obs RESERVOIR week day section start
1 1 1 MON 1 Start Site - 1
2 1 1 MON 2 Start Site - 1
3 1 1 MON 1 Start Site - 2
4 1 1 MON 2 Start Site - 2
5 1 1 TUES 1 Start Site - 1
6 1 1 TUES 2 Start Site - 1
7 1 1 TUES 1 Start Site - 2
8 1 1 TUES 2 Start Site - 2
9 1 1 WED 1 Start Site - 1
10 1 1 WED 2 Start Site - 1
11 1 1 WED 1 Start Site - 2
12 1 1 WED 2 Start Site - 2
13 1 1 THUR 1 Start Site - 1
14 1 1 THUR 2 Start Site - 1
15 1 1 THUR 1 Start Site - 2
16 1 1 THUR 2 Start Site - 2
17 1 2 MON 1 Start Site - 1
18 1 2 MON 2 Start Site - 1
19 1 2 MON 1 Start Site - 2
20 1 2 MON 2 Start Site - 2
21 1 2 TUES 1 Start Site - 1
22 1 2 TUES 2 Start Site - 1
23 1 2 TUES 1 Start Site - 2
24 1 2 TUES 2 Start Site - 2
25 1 2 WED 1 Start Site - 1
26 1 2 WED 2 Start Site - 1
27 1 2 WED 1 Start Site - 2
28 1 2 WED 2 Start Site - 2
29 1 2 THUR 1 Start Site - 1
30 1 2 THUR 2 Start Site - 1
31 1 2 THUR 1 Start Site - 2
32 1 2 THUR 2 Start Site - 2
For this section i am only dealing with the weekdays portion, but so far i have the following SAS program:
PROC SURVEYSELECT DATA=weekdays METHOD=SRS n=2 OUT=weekdaysa noprint;
STRATA week day;
RUN;
This does select 2 days per week but sometimes selects the same day for the week. I would like the days to be consecutive (e.g., if monday is selected, then Tuesday would also be selected).
Thanks for any assistance.
Since your second day is not randomly selected you might think of selecting the first "day" (I'm sort of confused with a numeric variable day that correspondes to 4 day names per week) and then use that information to indicate the following day is to be used in a data step.
Are you picking all of the start and startsites for a given day of the week?
It may help to show what an example desired result sample might look like from your shown example input data.
yes, i select the start (which is an am/pm variable) and the start site for each date. The results that i get now are often like this:
Obs week RESERVOIR day section start Prob Weight
1 1 1 WED 1 2 0.125 8
2 1 1 THUR 1 1 0.125 8
3 2 1 TUES 2 2 0.125 8
4 2 1 WED 2 1 0.125 8
5 3 1 MON 1 1 0.125 8
6 3 1 WED 2 2 0.125 8
7 4 1 MON 1 1 0.125 8
8 4 1 WED 2 2 0.125 8
9 5 1 MON 1 2 0.125 8
10 5 1 THUR 2 2 0.125 8
11 6 1 WED 2 1 0.125 8
12 6 1 THUR 2 1 0.125 8
13 7 1 MON 1 1 0.125 8
14 7 1 TUES 1 2 0.125 8
15 8 1 TUES 2 2 0.125 8
16 8 1 WED 2 1 0.125 8
17 9 1 THUR 1 2 0.125 8
18 9 1 THUR 2 2 0.125 8
Where in week 9, i get Thursday picked twice.
Okay, you've shown what you currently get. What do you want the output to look like?
Also since you are thinking "consecutive" then you really need to address "DAY" as character. THUR is the day after MON in your values.
Suppose I select the record with:
2 1 1 MON 2 Start Site - 1
Then I believe you are requesting another record in week 1 that is day=TUES. The second day is determined by the first selected so is not random.
Is there any rule involved for what to pick from the following day? Same section and start? Same section different start? Different Section same start? Different section and different start? Random section and start?
And what if Thur is the first picked? There isn't any "consecutive" day as in following within the same week. Or would that mean that if
THUR is selected you need a WED?
SAS Innovate 2025 is scheduled for May 6-9 in Orlando, FL. Sign up to be first to learn about the agenda and registration!
ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.
Find more tutorials on the SAS Users YouTube channel.