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assembly - Determine number of negative and positive numbers in an array

I need to determine the number of negative and positive numbers in an array in assembler. It seems that the assembler doesn't recognizes them as negative numbers. How can I solve this problem? I define the array this way:

word_array db 3, -2, 11, -1, -2, -7, -5, -20

I have this function that counts the positive ones:

count_positives:
mov dx, word [word_array + 2*ecx - 2]
cmp edx, 0
JL skip
inc ebx
skip:
loopnz count_positives
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