海量图书期刊资源,随时随地畅享阅读乐趣
The science achievement of various subgroups on alternative assessment formatsFrances Lawrenz; Douglas Huffman; Wayne Welch · 2001
The precision of data obtained in large-scale science assessments: An investigation of bootstrapping and half-sample replication methodsWayne W. Welch; Douglas Huffman; Frances Lawrenz · 1998