统计学学习指导与练习-畅读网

　　　　

统计学学习指导与练习

作者：李康荣

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内容简介:

统计学是通过搜索、整理、分析、描述数据等手段，以达到推断所测对象的本质，甚至预测对象未来的一门综合性科学。统计学用到了大量的数学及其它学科的专业知识，其应用范围几乎覆盖了社会科学和自然科学的各个领域。本书是统计学学习辅导及经典习题汇编，分章节练习和详细的试题解析。主要内容包括：统计学基本概念、描述统计、参数估计、假设检验、方差分析、相关和回归分析、时间序列分析、统计指数等基本内容。可用于大学本专科学生学习使用，也可用于统计学考研复习使用，又可以作为统计学教师教学辅助用书。

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SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 4 LIMIT 1 [ RunTime:0.001546s ]
SELECT `id`,`name` FROM `ls_goods_category` WHERE `id` = 40 LIMIT 1 [ RunTime:0.000664s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 11 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.002028s ]
SELECT `a`.*,`ap`.`width`,`ap`.`height` FROM `ls_ad` `a` INNER JOIN `ls_ad_position` `ap` ON `a`.`pid`=`ap`.`id` WHERE `pid` = 14 AND `ap`.`client` = '2' AND `a`.`status` = '1' AND `a`.`del` = '0' AND `ap`.`status` = '1' AND `ap`.`del` = '0' ORDER BY `sort` DESC,`id` DESC [ RunTime:0.003034s ]
SELECT * FROM `ls_goods` WHERE `del` = 0 AND `status` = 1 AND `create_time` <= 1755374705 ORDER BY `create_time` DESC LIMIT 5 [ RunTime:1.011607s ]

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