at random 任意,隨便; 任意地,隨機地; 隨便地,任意地; 隨機的,任意的; 隨機地,任意地; 隨意地,任意地; 隨意地,隨機地
random n. 〔罕用語〕胡亂行為,偶然的[隨便的]行動[過程]。 adj. 1.任意的,胡亂的,隨便的;(話等)信口亂說的;(人等)偶然碰到的。 2.隨機的;【物理學】無規(guī)則的;(石工)(大小)不齊的。 a random guess 瞎猜。 a random shot 亂射(的子彈);流彈。 at random 碰運氣地;無目標地,漫無目的地。 n. -icity 隨機性,無規(guī)性。
Random group and random permutation of idea 的隨機群和隨機置換
In this study three scales were used to measure a sample of 802 students selected from 4 middle schools by hierarchical random group sampling , and 766 available copies of scales were adopted to collect data which was processed with spss 10 . 0 本研究采用量表測量法,以分層整群隨機抽樣法抽取樣本。從四所中學隨機抽取初中和高中14個自然班共計802人組成樣本,有效問卷766份。
百科解釋
In mathematics, random groups are certain groups obtained by a probabilistic construction. They were introduced by Misha Gromov to answer questions such as "What does a typical group look like?