# Summing Weekend values to previous Friday

#### vikingo

##### New Member
HTML:
I am finding a gap in continuous data that is throwing a
wrench in a bivariate VAR. I need a way in SAS to sum the weekend
data of one variable in order to match a day by day set of
another (stock price data), How do I do that?

set1
date        var1
20130411     2.3
20120412     3.1
20120413     .
20130414     .
20130415     2.4

set2
date            var2
20130411          1.1
20120412          1.5
20120413          3.0
20130414         -2.0
20130415         -0.5

set1
date       var1       var2      combinedvar2
20130411     2.3    1.1      1.1 (thu)
20120412     3.1     1.5     2.5 =(1.5 + 3.0 -2.0) (friday)
20120413     .       3. 0     . (sat)
20130414     .      -2.0      . (sun)
20130415     2.4    -.05     -.05 (mon)

I can't seem to get find a weekend function that would help me do this. Any ideas?

Thanks
vikingo

Last edited:

#### vikingo

##### New Member
(SAS solution)

This is how I did it. The goal was to take the weekend values for a variable and lump them together with the previous friday value. In my case I need to match up an exogenous variable (daily values) with stock market data..which is Mon-Fri. It took me some time to find all the different tools but the key was to use a two step solution that included either the MOD or the WEEKDAY function followed by finding LEAD values and merging back.

data dataset3; set dataset2;
weekday = weekday(date); * 1=sunday, 2=monday,...,7=saturday;
run;

set dataset3;
keep date var2;
date = lag( date );
if date ^= . then output temp1;
date = lag( date );
if date ^= . then output temp2;
run;

data dataset4;
merge dataset3 temp1 temp2;
by date;
run;

data dataset5; set dataset4;
else var3 = var2; * every other day keeps original value
if weekday = 1 then delete; *delete sundays;
if weekday = 7 then delete; *delete saturdays;
run;

data dataset6;
merge dataset5 dataother;
by date;
run;
I originally hoped to accomplish this same solution with the proc expand procedure, but I couldn't get the zeros to stay zeros. anyone know why? or how to solve?

proc expand data=dataset3 out=datasetx;
id date;