9M Parent Math Talk Codes

Videos were divided into 30-sec intervals. Within each interval, we coded for 9 different types of math talk: cardinality, counting events and objects, abstract counting, identifying numerals, equivalence/nonequivalence relations, non-numerical quantitative terms, part-whole relations, and arithmetic. Coders recorded whether each type of math talk was observed during each 30-second interval (0 = not observed, 1 = observed) using an Excel spreadsheet. If parents ended a section of the recording before the allotted time, scores of zero were entered for all math talk categories in all intervals. The total of math talk observations was summed across categories and intervals to obtain a total frequency score for the recording. A total diversity score was obtained by summing up the number of math talk categories observed across all intervals (0-9 possible). Complexity scores were calculated by dividing the total number of math talk observations for the session by the number of intervals in which any math talk was observed (0-9 possible).

将所有视频划分为30秒的分段区间。在每个区间内，我们针对9类不同的数学话语（math talk）开展编码，具体包括：基数（cardinality）、计数事件与客体、抽象计数、识别数字符号、等价/非等价关系、非数值量化术语、部分-整体关系以及算术运算。编码人员通过Excel电子表格记录每类数学话语在对应30秒区间内的出现情况（0代表未观测到，1代表已观测到）。若家长在预设时长前终止某段录制，则为该段所有区间内的全部数学话语类别均记为0分。对所有类别与区间内的数学话语观测次数进行求和，即可得到该段录制的总频次得分。总多样性得分通过统计所有区间内被观测到的数学话语类别总数计算得出，取值范围为0至9。复杂度得分通过将单次录制会话中的数学话语总观测次数，除以存在数学话语出现的区间总数计算得到，取值范围同样为0至9。