RockDoctor writes "A recent paper published in PNAS describes statistical techniques for clearly displaying the presence of two types of electoral fraud — "incremental fraud" (stuffing of ballot boxes containing genuine votes with ballots for the winning party) and "extreme fraud" (reporting completely contrived numbers, typically 100% turnout for a vote-counting region, with 100% voting for the winning party). While the techniques would require skill with statistical software to apply in real time, the graphs produced in the paper provide tools for the interested non-statistician to monitor an election "live".
Examples are discussed with both "normal" elections, fraud by the techniques mentioned, and cases of genuine voter inhomogeneity.
Other types of fraud, such as gerrymandering and inhibiting the registration of minority voters, are not considered.
The paper is open access, so anyone with the technology to access it can read it."
Link to Original Source