This form employs the comparative count display software from NCBI, which performs a key-by-key comparison of two key-count distributions by generating a probability that the frequency of any key in the distribution differs by more than a given fold factor from the other distribution. Thus for two SAGE libraries, it performs a differential, tag-by-tag count comparison. Libraries may have unequal numbers of total tags. The software uses a key mapping file where the first column contains the key. If the key is *not* in this file, then it will not be compared.
The statistic is described in Lash et al. Genome Res. 2000 Jul;10(7):1051-60 ([PubMed]) and at NCBI.
Last modified on the 15th November 2002.
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