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CategoryCounts


Hello Everyone,

     I'm having trouble with the bivariate form of CategoryCounts.

I have an 1000 x 11 array named h1 whose 9th and 11th columns contain  
the month and year, such as

h1[[All, {9,11}]={{October, 1999}, {October, 1999}, {October, 1999},  
{August, 1999}, {August, 1999},...}

Picking off months is no problem because
CategoryCounts[h1[[All, 9]], {"October", "July", "August"}]
correctly gives me {38, 752, 210}.

And picking off years is also no problem because
CategoryCounts[h1[[All, 11]], {1999, 2000, 2001, 2002, 2003}]
correctly gives me {1000, 0, 0, 0, 0} (the first 1,000 observations  
all occurred in 1999).

But picking off months and years does not give me the 3 x 5 array  
that I expect:
CategoryCounts[h1[[All, {9,11}]], {{"October", "July", "August"},  
{1999, 2000, 2001, 2002, 2003}}]
yields {0, 0}.

     What am I doing wrong?  Any advice would be most appreciated.

         Greg


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