How selective is SSTP in Iowa, HSHSP and SSP?

<p>Can you guys post ur stats if u were accepted by SSTP in Iowa, hSHSP or SSP in the past? My gut feeling is that their acceptance rate is probably around 20%? Is there any summer physics or math research program that's not as selective as these three?</p>

<p>I guess promys or ross, but I’m not sure.</p>