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SEC Follow Up Exhibits Part C SEC_OEA_FCIC_001760-2501

SEC Follow Up Exhibits Part C SEC_OEA_FCIC_001760-2501

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Reg SHO Pilot Report 2/12/2007<br />

Table 10: Skewness<br />

This table summarizes how skewness changes when the tick and bid tests are removed. The four months prior to the<br />

pilot start date (May 2, 2005) are called the “Pre-Pilot” period and the six months following the start date are called<br />

the “Pilot” period. The table shows the average levels and changes in various skewness measures for pilot and<br />

control stocks and estimates whether the pilot stocks changed more than the control stocks. Sample skewness is<br />

computed for each stock in the pilot and contol sample in the Pre-Pilot and Pilot period, for five-minute, thirtyminute,<br />

and one day return intervals. Paired t-tests determine whether the changes are significant. Tests of the<br />

difference between the changes are two-sample t-tests. **, * indicates statistical significance at the 1% and 5% level<br />

in a two-tailed test.<br />

Pilot Sample Control Sample Pilot Δ minus<br />

Variable Market Pre-Pilot Pilot Δ Pre-Pilot Pilot Δ Control Δ<br />

Skewness—5m Listed 0.08 0.16 0.08 0.25 0.13 -0.12 0.20<br />

Skewness—5m Nasdaq 0.29 0.43 0.14 0.22 0.36 0.14 0.00<br />

Skewness—30m Listed 0.13 0.09 -0.04 0.13 0.13 0.00 -0.04<br />

Skewness—30m Nasdaq 0.20 0.32 0.12 0.13 0.23 0.10* 0.02<br />

Skewness—day Listed 0.06 0.15 0.09 0.17 0.21 0.03 0.06<br />

Skewness—day Nasdaq 0.26 0.35 0.09 0.16 0.29 0.13 0.05<br />

Prepared by the Office of Economic Analysis 70

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