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Matrix Differential Calculus with Applications in Statistics and Econometrics 3E
39 个回复 - 12985 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 - 2465 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 - 13752 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 - 1138 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 - 4837 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 - 7488 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

求助一篇文献，谢谢。Difference analysis of the relationship
2 个回复 - 771 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

Matching, Regression Discontinuity, Difference in Differences, and Beyond
1 个回复 - 1585 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

基于Walter A. Strauss偏微分方程导论习题答案Partial Differential Equations, 2e
4 个回复 - 1214 次查看基于Walter A. Strauss偏微分方程导论习题答案Partial Differential Equations, 2e Walter A. Strauss Partial Differential Equations An Introduction with Solutions Manual 2nd 基于Walter A. ...2022-2-24 18:49 - Lamarr-202110 - 现金交易版

Elementary Differential Equations and Boundary Value Problems,10th(by William E.
23 个回复 - 3742 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

Determinants of Relative Valuation in Different Industry Sectors
9 个回复 - 630 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 - 3943 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 - 2768 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 - 2745 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 - 12314 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 - 4901 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 - 2585 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 - 13796 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 - 9567 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 - 5738 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

tvdiff做多期DID平行检验的问题-leads&time-trend
2 个回复 - 1236 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

A Comprehensive Introduction to Differential Geometry
4 个回复 - 797 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 - 653 次查看求书never split the difference ，kindle可以看的2019-9-22 07:12 - 2931_1569072815 - Forum

bdiff分组系数比较, 报错：not sorted
7 个回复 - 4119 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

面板数据分组回归用bdiff进行组间系数检验
1 个回复 - 1394 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 - 6495 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 - 470 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 - 6704 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 - 4079 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 - 3499 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 - 3170 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 - 4119 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 - 17973 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 - 5684 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

Elementary Differential Equations and Boundary Value Problems (11th edition)
6 个回复 - 3615 次查看如题。2018-9-23 03:45 - 葉寶豐 - 经济金融数学专区

变量取对数后的一阶差分（First difference of LOG)≈增长率（percentage change)
3 个回复 - 3605 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 - 3734 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 - 4137 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 - 1557 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 - 1775 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 - 5715 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 - 6061 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 - 226 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 - 613 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 - 4977 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 - 1849 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 - 1634 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

StableDiffusionWEBUI 可视化启动器
2 个回复 - 1178 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 - 5766 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 - 261 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 - 1588 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 - 746 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 - 1221 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 - 1402 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 - 652 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 - 1845 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
1 个回复 - 252 次查看【作者(必填)】F Su, KS Chan 【文题(必填)】Testing for Threshold Diffusion 【年份(必填)】2017 【全文链接或数据库名称(选填)】Testing for Threshold Diffusion: Journal of Business & Economic Stat ...2023-1-22 15:20 - ssylzz - 求助成功区

Analysis of Markov Chain Approximation for Diffusion Models with Nonsmooth Coeff
1 个回复 - 471 次查看【作者(必填)】Gongqiu Zhang and Lingfei Li 【文题(必填)】Analysis of Markov Chain Approximation for Diffusion Models with Nonsmooth Coefficients 【年份(必填)】2022 【全文链接或数据库名称(选填 ...2023-1-19 15:54 - ssylzz - 求助成功区

DIFFERENTIAL GAMES
2 个回复 - 656 次查看【作者(必填)】Rufus Isaacs 【文题(必填)】DIFFERENTIAL GAMES 【年份(必填)】【全文链接或数据库名称(选填)】2019-5-23 10:57 - 落寞无果 - 求助成功区

Backward Stochastic Differential Equations From Linear to Fully Nonlinear Theory
1 个回复 - 1299 次查看 Stochastic Evolution Systems Linear Theory and Applications to Non-Linear Filtering 2nd Edition Authors Boris L. Rozovsky, Division of Applied Mathematics[/backcolor]Brown University[/backcolor] ...2019-2-16 02:14 - SleepyTom - 金融工程（数量金融）与金融衍生品

Introduction to Stochastic Differential Equations with Applications to Modelling
3 个回复 - 774 次查看书名: Introduction to Stochastic Differential Equations with Applications to Modelling in Biology and Finance 作者: Carlos A. Braumann 出版日期: 2019 出版商: Wiley 页数: 304 语言: 英语 A c ...2019-5-13 06:16 - zhangke0987 - 投资人（实务版）

Backward Stochastic Differential Equations From Linear to Fully Nonlinear Theor
2 个回复 - 1564 次查看 Backward Stochastic Differential Equations From Linear to Fully Nonlinear Theory[/backcolor] [*]Authors [*]Jianfeng Zhang, Department of MathematicsUniversity of Southern California ISB ...2019-2-16 02:18 - SleepyTom - 金融工程（数量金融）与金融衍生品

Stochastic Differential Equations, Backward SDEs, Partial Differential Equations
1 个回复 - 1492 次查看 Stochastic Differential Equations, Backward SDEs, Partial Differential Equations( Stochastic Modelling and Applied Probability Series ) by Etienne Pardoux and Aurel Rascanu Springer International ...2019-2-3 02:51 - SleepyTom - 金融工程（数量金融）与金融衍生品

Nonlinear Differential Equations of Monotone Types in Banach Spaces
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