最近在阅读文献中，有这么一段我不知道他是如何记录原始数据并编辑SAS分析程序的，请高手指点。原文：Aphid Response to BYDV-Infected Versus Noninfected Untransformed Varieties ‘Lambert’ and ‘Caldwell’.The response of aphids to BYDV-infected versus noninfected plants of Lambert and Caldwell was tested in separate arenas. There were 10 replicates for each comparison per variety. The arena was made from a 150-mm-diameter polystyrene petri dish. The bottom of the petri dish was lined with 150-mm-dimeter Þlter paper (Whatman), which was in contact with wheat leaves. The leaves, attached to the test plants, were positioned horizontally in the dish, equally distant from the center opposite to one another. Three leaves from each of two treatments (infected or noninfected) were used to produce a dual-choice test. Aphids could touch the leaves with their tylets or tarsi. Aphid locations on or near the leaves (1 cm on either side of leaves) were recorded every 20 min for a 2-h period. The total number of aphids tested for the entire bioassaywas 800. Each test was analyzed as a separate experiment comparing the number of aphids on each treatment and using a generalized linear model, assuming a binomial distribution with a logit link function (PROC GENMOD; SAS nstitute 1990). Aphids not located on either treatment were excluded from the analysis.谢谢！