[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fu2DfAH3T5jtlSLVVEBh_j6t5fE5_p5H8yBb27fRbWkU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-12-16 13:22:20",268420951,[8,9,10,11],"替代难以测量的目标变量的观测变量","数据质量检查变量","随机生成的辅助变量","与结果无关的变量",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},24,"53e1d2ef4961cca8eea3e23969ad2cb9","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","默认课程","exam_167157860","信息系统与数据库技术","代理变量的定义是",[21,32,41,50,59,68,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],268420946,[25,26,27,28],"数据编码","数据标准化","数据类型转换","缺失值表达","在数据集中用 -999 表示缺失值,这属于","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],268420947,[36,37,38,39],"时间变量","定比变量","定类变量","连续型变量","One-hot 编码适用于哪类变量",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],268420948,[45,46,47,48],"二进制文件","JSON文件","XML结构化文件","纯文本文件","Excel文件存储的本质格式是",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],268420949,[54,55,56,57],"按群体整体抽取","先分层,再按比例抽取","每个个体机会均等","不考虑样本结构","分层抽样的特点是",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],268420950,[63,64,65,66],"健康状况差的人不愿回答健康问题","问卷随机遗漏","Excel 打不开文件","系统保存错误","MNAR(非随机缺失)的例子是",{"answer":69,"createTime":5,"id":6,"options":70,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],268420952,[75,76,77,78],"会产生乱码","会增加数据量","会低估方差,削弱数据波动性","会导致系统崩溃","均值填补缺失值的缺点是",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],268420953,[84,85,86,87],"样本太小,随机波动","样本覆盖不足","问卷设计不合理","数据录入错误","抽样误差的来源是",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],268420954,[93,94,95,96],"保持文本形式","取中点2.5","取上界3","取下界2","区间变量&quot;2&ndash;3小时&quot;转为数值时,常见的处理方法是",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],268420955,[102,103,104,105],"健康差的人不填健康问题","收入较高的人不填收入","问卷未发放","填写时电脑死机","MAR(条件随机缺失)的例子是"]