In this article, data from the Reading Literacy study conducted in 2000 and 2001 as part of the OECD Programme for International Student Assessment (PISA) were analysed in order to explore equivalence issues across the 47 test adaptations in various languages of instruction that were used by the participating countries. On average, about 82% of the variance in relative item difficulty were found to be common across the various national versions. However, the index of equivalence appeared to be lower than desirable in certain categories of countries. Tentative analyses were conducted to better understand the reasons behind these differences.
SUMER — the Solar Ultraviolet Measurements of Emitted Radiation instrument on the Solar and Heliospheric Observatory (SOHO) of ESA and NASA — observed its first Hollister Outlet Stores light on January 24, 1996 and covered the minimum of the sunspot activty between the solar cycles 22 and 23 with nearly continuous observations. Consequently, in many studies Hollister Clothing Coupons
particular emphasis was put on quiet Sun investigations. We will review in this presentation some of the observational results on the transition region and the low corona obtained by UV and EUV emission
line measurements. The chromospheric network, including its small scale activity, will be discussed, as well as polar coronal holes.