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Summing Weekend values to previous Friday

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I am finding a gap in continuous data that is throwing a wrench in a bivariate VAR. I need a way 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


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