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A very good discussion of the fico model. I'll just quote the relevant paragraphs. The entire article is worth reading.

"FICO has changed the way it factors credit checks, inquiries. These changes should minimize the «negative» effects that aggressive rate shopping or the normal mortgage process can have on a mortgage applicant. In the new Beacon version, the deduping process has been expanded beyond seven days. One variable counts the number of days within 365 days of scoring. If there has not been an inquiry, the deduping mechanism is not activated. If there is a consumer originated inquiry within the past 365 days from mortgage or auto related industries, these inquiries are ignored for the first 30 calendar days from scoring; then, multiple inquiries within the next 14 days are counted as one. Each inquiry will still appear on the credit report.

Scores should not change significantly because the variable in the model using inquiries contributes less than 5% of the predictive power of the model. According to Equifax statisticians, an average of 5% of the credit reports in the Equifax consumer credit reporting database (over 200 million consumer files) will see a change in score due to this. Fewer than 5% of those will see a change significant enough to effect a loan decision. "

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