It is impossible to get genotyping data and also difficult to get DNA sample or any other sample. But I want to make a satistical comparison of genetic diversity from published data and my study. I hope someone can show me the way how to do it.
You haven't mentioned your organism, so I'll assume human. If you're just looking for variant data, then 1000 genomes[1] is a source of public data on most detectable common and not-so-common variants. There's also the HapMap project[2], which tries to cover a wide range of the world's populations.
If you want something deeper, then there's the Sequence Read Archive[3], which has a few petabytes of raw data (from NGS sequencers) from a number of different studies. Mostly non-human, but there are a few human studies there as well.
FWIW, it is also possible to get raw sequencer data for the 1000 genome project, but you'll need quite a few hard drives to store it.
[1] http://www.1000genomes.org/data
[2] http://hapmap.ncbi.nlm.nih.gov/downloads/index.html.en
[3] http://www.ncbi.nlm.nih.gov/Traces/sra/sra.cgi?view=samples
The Human Genome Diversity Project is also a nice public dataset, with many publications, that can be downloaded here:
http://www.hagsc.org/hgdp/files.html
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