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上市公司竞争战略成本领先差异化战略年报词频统计2001-2021数据关键词词集
1 个回复 - 909 次查看 上市公司竞争战略成本领先差异化战略年报词频统计2001-2021数据关键词词集 数据来源:基于上市公司年报数据整理计算 数据范围:沪深上市公司,A股主板中小企业板科创板创业板 数据期间:2001-2021 ...2022-11-10 09:24 - yusb - 现金交易版
TCGA数据甲基化差异分析生存分析 in R
2 个回复 - 1477 次查看 TCGA数据甲基化差异分析生存分析 in R 02 download 03_geneMatrix 04 diff 05 diffPval 06 heatmap 07_methyGeneMerge 08_methyGeneCor 09_posMatrix 10_posGeneMerge 11_posGeneCor 12 time 13_mer ...2022-4-28 07:07 - Kathy-202109 - 现金交易版
快时尚与奢侈品上市公司论文数据2013-2020年
4 个回复 - 937 次查看 快时尚与奢侈品上市公司论文数据2013-2020年 涉及公司; 涉及变量:2021-7-24 19:28 - lenosky - 现金交易版
Seventy Five (Thousand) Unsolved Problems in Analysis and Partial Differential E
11 个回复 - 1737 次查看 Seventy Five (Thousand) Unsolved Problems in Analysis and Partial Differential Equations **** 本内容被作者隐藏 ****2020-8-18 20:05 - hylpy1 - 经济金融数学专区
Partial Differential Equations in the 20th Century
14 个回复 - 2154 次查看 Partial Differential Equations in the 20th Century Ha@m Brezis and Felix Browder Received September 11, 1997 **** 本内容被作者隐藏 ****2020-5-6 09:07 - hylpy1 - 经济金融数学专区
DYNAMICS of SECOND ORDER RATIONAL DIFFERENCE EQUATIONS
5 个回复 - 1056 次查看 DYNAMICS of SECOND ORDER RATIONAL DIFFERENCE EQUATIONS -With Open Problems and Conjectures by M. R. S. Kulenovi´c,G. Ladas **** 本内容被作者隐藏 ****2019-10-24 13:46 - hylpy1 - 微观经济学
Elementary Differential Equations and Boundary Value Problems,10th(by William E.
24 个回复 - 3861 次查看 Elementary Differential Equations and Boundary Value Problems, 10th (by William E. Boyce,Richard C. DiPrima) **** 本内容被作者隐藏 ****2019-1-8 14:26 - hylpy1 - 经济金融数学专区
Matrix Differential Calculus with Applications in Statistics and Econometrics 3E
39 个回复 - 13632 次查看 Matrix Differential Calculus with Applications in Statistics and Econometrics, 3rd Edition by Jan R. Magnus (Author), Heinz Neudecker (Author) About the Author JAN R. MAGNUS is Emeritus Professo ...2019-5-13 07:46 - slowry - 金融学(理论版)
Differential Equations and Linear Algebra by gilbert strang
40 个回复 - 2569 次查看 English | 2014 | ISBN: 0980232791 | 512 pages | PDF (scan) Differential equations and linear algebra are the two crucial courses in undergraduate mathematics. This new textbook develops those subje ...2018-10-30 22:16 - igs816 - 经管书评
避税程度的数据和stata命令(ETR BTD DDBTD diffrate tacetr等)
31 个回复 - 14072 次查看 全部A股,剔除了金融类公司 数据包括2005-2019年 因数据是2019年2月下旬整理的,所以只有在此之前已经披露了年报的公司2019年的相关数据可得 stata命令只包括计算DDBTD的命令,其他的就只涉及加减除,就不另外 ...2020-3-9 15:22 - 愿望二分之一 - 现金交易版
Distributions, Partial Differential Equations, and Harmonic Analysis
5 个回复 - 1156 次查看 【作者(必填)】 【文题(必填)】Distributions, Partial Differential Equations, and Harmonic Analysis 【年份(必填)】2018 【全文链接或数据库名称(选填)】https://link.springer.com/book/10.1007/978-3-0 ...2018-12-29 10:50 - nivastuli - 求助成功区
Partial Differential Equations Lawrence C Evans 高清英文版
8 个回复 - 4885 次查看 Partial Differential Equations Lawrence C Evans 高清英文版 American Mathematical Society2018-1-16 18:56 - Dogesick丶 - 经济金融数学专区
用bdiff检验xtabond2 gmm估计的组间差异检验,总是提示“)required”
11 个回复 - 7643 次查看 如题,用xtabond2 gmm做了分组回归,用连老师的bdiff命令进行组间差异检验,stata总是提示“)required”, 检查之后也没缺括号呀,为什么会这种情况呢? 我的命令是 local m "xtabond2 y l.y combine comx $xx ...2019-7-7 18:18 - cueb周行 - Stata专版
bdiff分组系数比较, 报错:not sorted
9 个回复 - 4536 次查看 请问利用bdiff命令去做分组回归系数比较的检验,总是出错 总是提示:not sorted . local m "xtreg Wfassets6_mid L.MPU L.WVOX i.quarter,fe r" . bdiff, group(equity) model(`m') reps(100) bs first ...2020-11-21 16:10 - 三重虫 - Stata专版
Determinants of Relative Valuation in Different Industry Sectors
9 个回复 - 653 次查看 【作者(必填)】B. Rajesh Kumar 【文题(必填)】Determinants of Relative Valuation in Different Industry Sectors—An Empirical Study 【年份(必填)】The Journal of Wealth Management Summer 2019, 22 (1 ...2019-8-1 14:52 - yishuiyuan2604 - 求助成功区
用tvdiff平行趋势检验,结果no observations
6 个回复 - 4130 次查看 参考https://mp.weixin.qq.com/s/bJ7kMK6lK21Ra_gYMeiDMA的方法做平行趋势检验代码如下: xtset id year generate D = (year - year0 == 0) global xlist "age tfp le kl sp div er " tvdiff so2 D $xlist, mo ...2021-12-18 16:38 - 经济学小家 - Forum
stata bdiff分组做多少次
3 个回复 - 2868 次查看 如题,想问问各位大神,bdiff分组回归的reps()应该重复多少次比较好?期刊和毕业论文对这个有什么要求吗2020-8-14 10:39 - alliswellxd - Stata专版
long- difference regression是什么意思
4 个回复 - 2950 次查看 在读文献的时候发现有的学者使用了long- difference regression来做,想问一下什么是long- difference regression? 具体来说就是本来是面板数据,由于工具变量是截面的,所以将面板数据的Y取增长率、控制变量取 ...2019-3-15 21:30 - 主观性3 - 爱问频道
关于bdiff命令的疑问
8 个回复 - 12561 次查看 我们在做分组检验的时候,比如:图中以“是否是国企(SOE)”进行分组,得到两个分组回归结果,交互项(c.ROA#c.Af)的系数一个为0.1***,另一个为0.59。我用bdiff命令对其进行组间系数检验,得到二者之间的P值为0.3 ...2019-3-30 10:39 - yangye823 - 现金交易版
在做bdiff时出现问题,急求前辈解答!
11 个回复 - 5273 次查看 我在运行dbiff命令时,看到一个经验贴说bdiff,group(分组变量) model(reghdfe y x 控制变量) absorb(year symbol)可以这样操作,我在运行时就是按照这个来的,但是却出现了option absorb() not allowed这样的错误提示 ...2022-10-1 22:01 - fgvecb - Stata专版
tvdiff显示no abservation
4 个回复 - 2685 次查看 请各位大佬看一下为什么用tvdiff做多期DID的平行趋势检验显示no observation了呢?大概有154万个观测值,控制变量有10个,工企98-05的非平衡面板,下面是具体命令. tvdiff tfp_op D $Xs,model(fe) pre(4) post(7) te ...2021-11-25 09:24 - WangZihan2001 - Stata专版
stata做bdiff出现两组观察两不一样怎么解决
21 个回复 - 14129 次查看 如题,有个国家级数据ITR,根据ITR可以把国家分为高低两组,但是高低两组的公司数量不一样。所以导致一个高的样本量接近15万,低组的样本量8万多。 做了bdiff,命令是 bdiff, group( ITR_Level ) model( 我自己的回 ...2019-2-15 01:43 - 燃耗度 - Stata专版
双重差分用stata的diff命令怎么做都是0
12 个回复 - 9778 次查看 请问这是怎么回事,我用diff命令做出来都是0,这是数据,无论多少样本有没有控制变量diffindiff都是0。。。。 如果用xtreg做系数都是负值,我要爆炸了2019-2-23 20:35 - xiaos1020 - Stata专版
bdiff求助
7 个回复 - 6219 次查看 local control "size lev growth roa cash top1 board indep state age dual m1-m20 n1-n9" bdiff,group(a) model(xtreg y x `control',fe r) reps(1000) bs first detail 代码如上(m、n均是虚拟变量)在做面板数 ...2020-11-5 13:12 - sunhanhan1996 - Stata专版
求助一篇文献,谢谢。Difference analysis of the relationship
2 个回复 - 786 次查看 【作者(必填)】panelYimanDong[/backcolor] T[/backcolor]aoZhao[/backcolor] 【文题(必填)】Difference analysis of the relationship between household per capita income, per capita expenditure and ...2018-6-16 10:41 - w1w2jack - 求助成功区
tvdiff做多期DID平行检验的问题-leads&time-trend
2 个回复 - 1285 次查看 求问各位大佬,我在用tvdiff做多期DID平行趋势检验时,Test for 'parallel trend' using the 'leads'是什么意思?Test for 'parallel trend' using the 'time-trend'又是什么意思? 我的多期DID在Test for 'paralle ...2022-7-5 14:38 - 两条鱼er - Stata专版
Matching, Regression Discontinuity, Difference in Differences, and Beyond
1 个回复 - 1732 次查看 之前的文件部分有亂碼,重新發一下。 Matching, Regression Discontinuity, Difference in Differences, and Beyond by Myoung-jae Lee [*]For the three most popular research methods (matc ...2019-2-20 23:03 - SleepyTom - 金融工程(数量金融)与金融衍生品
A Comprehensive Introduction to Differential Geometry
4 个回复 - 862 次查看 A Comprehensive Introduction to Differential Geometry, Vol.1- 5, 3rd Edition(vol2 为djvu格式) 作者: Michael Spivak 出版社: Publish or Perish 出版年: 1999-1-1 页数: 467 定价: USD 50.00 装帧: Ha ...2023-1-22 22:54 - wxwpxh - 经济金融数学专区
【学习笔记】求书never split the difference ,kindle可以看的
2 个回复 - 685 次查看 求书never split the difference ,kindle可以看的2019-9-22 07:12 - 2931_1569072815 - Forum
面板数据分组回归用bdiff进行组间系数检验
1 个回复 - 1429 次查看 面板数据分组回归用bdiff进行组间系数检验时,老是出现这个问题是什么原因,求助各位老师同学!!! 所用代码: global x " laem lncskew lmb lsigma lroe llev llnsize ldturn lret lopaque i.ind i.year" ...2022-3-6 17:00 - 莉娅莉娅 - Stata专版
stata中bdiff显示insufficient observations
14 个回复 - 6682 次查看 面板数据做了分组回归后,想用费舍组合检验下两组主要变量的相关系数,运行如下: global x "khy rz rpt zycd L1 A2 lnsize lntrasize" local m "xtreg ZF $x ,fe" bdiff, group( rz) model(`m') reps(1000) bs f ...2020-7-7 21:32 - 我我我XXX - Stata专版
PSM-DID可以直接使用diff命令吗
1 个回复 - 490 次查看 陈强老师在《高级计量经济学与stata应用》中推荐的“双重差分倾向得分匹配(PSM-DID)”命令是diff, 请问这个命令是对数据进行逐期匹配还是将面板数据视为混合截面进行匹配? 我猜测应该是前者,因为如果是后者 ...2022-11-24 11:16 - Juliet的日常 - Stata专版
求助!!! stata中使用bdiff出现 model() required r(198)报错,该怎么操作
7 个回复 - 6893 次查看 bdiff, group(a) modle(probit y x)surtest 出现option model() required 报错 另,想问用bdiff时,分组变量还需要加入model中吗,我试了无论加入与否都会报错。 请求解答,万分感谢!2021-3-25 11:46 - 21312525 - Stata专版
求助!!!STATA用diff函数做psm-did,显示no observations,但psmatch2函数可以输出结
8 个回复 - 4170 次查看 首先是变量类型,已经将city利用encode city, gen(city1)进行编码 然后psmatch2也能跑出来 普通的did也没问题,但是核匹配的did就出现no observations的情况 跪求大佬指点QAQ2020-8-1 22:49 - jazzax - Stata专版
求助stata的diff程序安装包
4 个回复 - 3576 次查看 求助stata的diff程序安装包,用ssc install diff安装不了2020-5-10 18:50 - xinru367 - Stata专版
personality and individual differences投稿疑问
8 个回复 - 3230 次查看 请问PAID投稿一个月了,状态还是with editor,状态时间改过两次,请问这个正常吗?有一篇和我差不多类型的实证研究,晚投半个月都已经under review了2021-12-18 12:44 - xsk12342 - 学术道德监督
使用tvdiff命令得到的多期DID平行趋势检验图,算是通过了吗
11 个回复 - 4242 次查看 请问使用tvdiff命令得到的多期DID平行趋势检验图,算是通过了吗,求助,谢谢2023-1-15 14:27 - haoyun010 - Stata专版
bdiff 命令检验组间差异系数
12 个回复 - 18515 次查看 bdiff,group(m) model(xtreg wInvisetment wLgrowthcycle post postcycle0 $xx ,fe cluster(stkcd))reps(200) bsample 使用这个命令得到的结果里每个变量的frequency次数都不同,而且重点关注的系数 postcycle0的抽 ...2019-12-28 11:06 - 宁馨儿101 - Stata专版
连玉君老师写的bdiff检验组间系数设置seed出现的问题
9 个回复 - 6033 次查看 运用连玉君老师编写的bdiff命令检验组间系数差异,为了结果的可复制性设置seed(),但结果非常奇怪,很多变量的frequency是0,并且p值为0.000,请教大家这是为什么呢?命令:bdiff, group(scutalstper_d) model(xtr ...2020-7-9 23:57 - cicicihhh - Stata专版
变量取对数后的一阶差分(First difference of LOG)≈增长率(percentage change)
3 个回复 - 3792 次查看 以下这个解答很精彩,原汁原味借鉴过来,供大家参考交流。 First difference of LOG = percentage change: When used inconjunction with differencing, logging converts absolute differences into relative (i ...2021-2-20 21:26 - yinpeiwei - Forum
用DID模型时,我发现用diff和reg得出来的结果是一样的,但是用xtreg却不一样。
6 个回复 - 3825 次查看 用reg q after##treat x lnrb lnpc dppi 与用diff q , t(treat) p(after) cov( lnrb lnpc dppi x ) report 以上两个跑出来的结果是一样的。 但用xtreg q after##treat x lnrb lnpc dppi 结果就不一样了 ...2020-5-27 21:14 - totomaqu7909 - Stata专版
多期DID平行检验,tvdiff命令的 leads通过,但time-trend没通过怎么办
8 个回复 - 4244 次查看 请教各位老师,在采用平行DID时,tvdiff命令的默认lead通过检验,但time-trend没通过怎么办?还可以用平行DID吗?并且我的模型加入时间趋势,发现时间趋势并不显著,还需要考虑它吗? [CODE] [*]Example generated ...2020-10-25 21:39 - yuzhihe2853 - Stata专版
DID中diff相关问题
4 个回复 - 1579 次查看 求助大佬,为什么此时控制组在政策实施后的个体为0?是因为在此之前我所设定的treat和post变量有误吗?检查了好几遍也没有发现错误,想了一个多小时了2022-12-18 23:57 - 努力学习stata~ - Stata专版
Differences and Commonalities between the Two Areas of Quantitative Finance
2 个回复 - 1886 次查看 There exist two separate branches of finance that require advanced quantitative techniques: the "Q" area of derivatives pricing, whose task is to "extrapolate the present"; and the "P" area of quantit ...2022-12-20 14:27 - 宽客老丁 - python论坛
双重差分模型,一个PPT:Difference in difference models
5 个回复 - 5786 次查看 免费共享一个ppt,有需要的自取2018-4-28 20:54 - errorzhu - 计量经济学与统计软件
求大佬指点双重差分法diff命令与xtreg的区别
8 个回复 - 6159 次查看 请问在stata中,用两年的不平衡面板数据,使用stata自带的diff命令做双重差分;和xtreg y D*T D T x,fe以及reg y D*T D T x有什么区别呢?分别适用于什么情况,或者哪一个才是正确的呢?(D*T为关键的政策实施解 ...2020-6-5 21:09 - lucky白羊 - Stata专版
求助文献Synthetic Difference-in-Differences 2021 Synthetic Difference-in-
1 个回复 - 237 次查看 主题:求助文献Synthetic Difference-in-Differences[/backcolor]2021 Synthetic Difference-in-Differences.pdf[/backcolor]2022-11-29 10:43 - 729728971 - 灌水吧
Differences in the health behaviors of elderly individuals and influencing facto
3 个回复 - 626 次查看 【作者(必填)】Erpeng Liu,Yan Feng,Zhang Yue 【文题(必填)】Differences in the health behaviors of elderly individuals and influencing factors: Evidence from the Chinese Longitudinal Healthy Longev ...2019-10-25 23:22 - zxm403 - 求助成功区
【Springer新书】A Visual Intro to Differential Forms & Calculu on Manifold
14 个回复 - 5074 次查看 A Visual Introduction to Differential Forms and Calculus on Manifolds2018-11-7 14:15 - 北固隐 - 微观经济学
Differential Equations with Mathematica (Fourth Edition)
8 个回复 - 1888 次查看 Differential Equations with Mathematica (Fourth Edition) Martha L. Abell and James P. Braselton Differential Equations with Mathematica, Fourth Edit ...2017-10-13 10:14 - deem - MATLAB等数学软件专版
stata_code_loecker2011 Product differentiation, multi-product firms
1 个回复 - 1682 次查看 Econometrica, Vol. 79, No. 5 (September, 2011), 1407–1451PRODUCT DIFFERENTIATION, MULTIPRODUCT FIRMS, ANDESTIMATING THE IMPACT OF TRADE LIBERALIZATIONON PRODUCTIVITYBY JAN DE LOECKERThis paper studie ...2020-8-28 13:21 - xuehe - Stata专版
求助 “Guide to Differential Privacy Modifications”
2 个回复 - 282 次查看 【作者(必填)】Balázs Pejó, Damien Desfontaines 【文题(必填)】Guide to Differential Privacy Modifications: A Taxonomy of Variants and Extensions 【年份(必填)】2022 【全文链接或数据库名称(选填 ...2023-2-25 00:19 - 13555555531 - 求助成功区
求问各位大佬,双重差分diff和reg命令做出的系数一定是一样的吗?
0 个回复 - 368 次查看 这两个命令有什么使用范围或者计算方式的区别吗?我看陈强老师的书上做出来的系数一样,但我的影响方向和显著性是一样的,系数和P值不太一样。 diff target if sample==0,t(treated) p(time) robust reg target dt ...2023-2-22 13:31 - Stata不是我的对手 - Stata专版
StableDiffusionWEBUI 可视化启动器
2 个回复 - 1228 次查看 可视化界面展示2023-1-11 01:56 - Antiky - Forum
关于bdiff命令出现found where '(' expected的疑问
9 个回复 - 5983 次查看 使用连玉君老师的bdiff命令,出现了看不懂的错误指令... 代码如下: *费舍尔组合检验 (Fisher's Permutation test) xtset id Year gen turnover_test=1 if turnover>ind_turnover replace turnover_test=0 i ...2021-4-26 09:37 - Minow233 - Stata专版
Eigenvalue difference test for the number of common factors in the approximate f
1 个回复 - 369 次查看 【作者(必填)】 Wu Jianhong 【文题(必填)】Eigenvalue difference test for the number of common factors in the approximate factor models 【年份(必填)】2018 【全文链接或数据库名称(选填)】10.1016/ ...2023-2-7 19:54 - 我来了 - 文献求助专区
Random Ordinary Differential Equations and Their Numerical Solution
7 个回复 - 1637 次查看 This book is intended to make recent results on the derivation of higher order numerical schemes for random ordinary differential equations (RODEs) available to a broader readership, and to familiariz ...2017-10-28 09:29 - nivastuli - 博弈论
Fractional Diffusion Equations and Anomalous Diffusion
3 个回复 - 772 次查看 Anomalous diffusion has been detected in a wide variety of scenarios, from fractal media, systems with memory, transport processes in porous media, to fluctuations of financial markets, tumour growth, ...2018-2-2 07:30 - nivastuli - 博弈论
Applied Differential Equations with Boundary Value Problems
3 个回复 - 1248 次查看 Applied Differential Equations with Boundary Value Problems presents a contemporary treatment of ordinary differential equations (ODEs) and an introduction to partial differential equations (PDEs), in ...2018-2-4 07:08 - nivastuli - 博弈论
Handbook of Ordinary Differential Equations Exact Solutions, Methods, and Probl
2 个回复 - 1455 次查看 The Handbook of Ordinary Differential Equations: Exact Solutions, Methods, and Problems, is an exceptional and complete reference for scientists and engineers as it contains over 7,000 ordinary differ ...2018-2-4 08:31 - nivastuli - 博弈论
Differential Equations For Scientists and Engineers
4 个回复 - 665 次查看 【作者(必填)】Allan StruthersMerle Potter 【文题(必填)】Differential EquationsFor Scientists and Engineers 2nd edition 【年份(必填)】2019 【全文链接或数据库名称(选填)】https://link.springer.co ...2019-7-31 22:17 - nivastuli - 求助成功区
Lectures on Partial Differential Equations (Universitext)
10 个回复 - 1890 次查看 Lectures on Partial Differential Equations 作者: Vladimir I. Arnold[/backcolor] [/backcolor] 出版社:[/backcolor] Springer[/backcolor] 译者: Roger Cooke[/backcolor] [/backcolor] 出版年:[/backcolor ...2017-10-14 10:03 - deem - 金融学(理论版)
Testing for Threshold Diffusion
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Differential Games: A Concise Introduction
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Introduction to Stochastic Differential Equations with Applications to Modelling
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Nonlinear Differential Equations of Monotone Types in Banach Spaces
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Lectures on BSDEs, Stochastic Control, and Stochastic Differential Games with F
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Constrained Optimization and Optimal Control for Partial Differential Equations
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Optimization and Differentiation
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Cartan for Beginners Differential Geometry-Thomas A.Ivey J. M.Landsberg
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HOW LARGE IS THE JUMP DISCONTINUITY IN THE DIFFUSION COEFFICIENT OF A TIME-HOMOG
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A Short Course in Differential Topology
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