This is an example of the data I have.
ID | date | obs |
100 | 01Jan2014 | 45 |
100 | 02Jan2014 | 74 |
100 | 03Jan2014 | . |
100 | 04Jan2014 | . |
100 | 05Jan2014 | 20 |
100 | 06Jan2014 | 43 |
100 | 07Jan2014 | 23 |
100 | 08Jan2014 | . |
100 | 09Jan2014 | 456 |
100 | 10Jan2014 | 23 |
200 | 01Jan2014 | . |
200 | 02Jan2014 | . |
200 | 03Jan2014 | . |
200 | 04Jan2014 | . |
200 | 05Jan2014 | 42 |
200 | 06Jan2014 | 56 |
200 | 07Jan2014 | 32 |
200 | 08Jan2014 | . |
200 | 09Jan2014 | 32 |
200 | 10Jan2014 | . |
300 | 01Jan2014 | 556 |
300 | 02Jan2014 | . |
300 | 03Jan2014 | . |
300 | 04Jan2014 | . |
300 | 05Jan2014 | . |
300 | 06Jan2014 | . |
300 | 07Jan2014 | . |
300 | 08Jan2014 | 52 |
300 | 09Jan2014 | 12 |
300 | 10Jan2014 | 45 |
I want output that reports each occasion of missing values (coded as '.') for the variable obs. Each observation in the output dataset should represent an occasion when obs is missing for either a single day or consecutive days. Each observation in the new output needs to include the ID variable, a variable that identifies the occassion of missing data and the number of consecutive days that obs was missing. So the new count variable should equal 1 for single day of missing data or >1 for consecutive days of missing data.
Thank you in advance for any help you can offer on this problem.
Based on the data you mentioned. Give example of the output of data set you want.
I am looking for output like this:
ID | first_date | count |
100 | 03Jan2014 | 2 |
100 | 08Jan2014 | 1 |
200 | 01Jan2014 | 4 |
200 | 08Jan2014 | 1 |
200 | 10Jan2014 | 1 |
300 | 02Jan2014 | 6 |
The first_date variable represents the date of missing data for a single day or the first day of consecutive days of missing data. Basically the output should let me estimate a mean length of consecutive days of missing values.
Assuming your data are sorted by id and date:
data want (where=(miscount>0));
set have;
by id date;
retain misscount;
if first.id then misscount= .;
if missing(obs) then misscount+1;
else misscount= .;
run;
Or if you want 0 instead of . for the missing count use 0.
Message was edited by: data _null_ Added format statement format obs 1.;
This is what I needed. Thank you.
data missdate; infile cards dsd firstobs=2; input ID :$3. date :date. obs; format date date11.; cards; ID,date,obs 100,01Jan2014,45 100,02Jan2014,74 100,03Jan2014,. 100,04Jan2014,. 100,05Jan2014,20 100,06Jan2014,43 100,07Jan2014,23 100,08Jan2014,. 100,09Jan2014,456 100,10Jan2014,23 200,01Jan2014,. 200,02Jan2014,. 200,03Jan2014,. 200,04Jan2014,. 200,05Jan2014,42 200,06Jan2014,56 200,07Jan2014,32 200,08Jan2014,. 200,09Jan2014,32 200,10Jan2014,. 300,01Jan2014,556 300,02Jan2014,. 300,03Jan2014,. 300,04Jan2014,. 300,05Jan2014,. 300,06Jan2014,. 300,07Jan2014,. 300,08Jan2014,52 300,09Jan2014,12 300,10Jan2014,45 ;;;; run; data want(drop=date); set missdate; by id obs notsorted; retain _date; if first.obs then do;_date=date;n=0; end; n+1; if last.obs and missing(obs) then output; format _date date9.; run;
Xia Keshan
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