Stata Nlcom, Jun 28, 2025 · Stata’s procedure nlcom is a particularly versatile and powerful implementation of the delta method. Stata is a complete, integrated software package that provides all your data science needs—data manipulation, visualization, statistics, and automated reporting. 04; 95%CI = (0. You are calculating the marginal effects at the means of the variables, whereas -margins- is calculating the average marginal effects. Stata Resources and Support Stata 19 documentation Stata's documentation consists of over 19,000 pages detailing each feature in Stata, including the methods and formulas and fully worked examples. The delta method, whose foundations were laid in the 1940s by Cramér (Oehler Dec 1, 2021 · Your -predictnl- and -nlcom- commands are predicting a different statistic from what -margins- is calculating. Can Stata take advantage of all the cores on my computer for extra speed? Yes; Stata/MP can perform calculations in parallel on 2 to 64 cores. 001. 51, 1. It is tailored to the needs of academics and other research practitioners who are new to Stata or wish to refresh their skills. Description Quickstart Menu Syntax Options Remarksandexamples Storedresults Methodsandformulas References Alsosee. 10 Listing data and basic command syntax 11 Creating new variables 12 Deleting variables and observations 13 Using the Do-file Editor—automating Stata 14 Graphing data 15 Editing graphs 16 Saving and printing results by using logs nlcom 在估计之后可对系数进行非线性组合，并得到标准误、t统计量、z统计量、p值。 语法 nlcom [name:]exp [, options] *示例 webuse regress regress y x1 x2 x3 nlcom _b[x2]*_b[x3] nlcom (ratio1: _b[x1]/_b[x2]) (ratio2: _b[x2]/_b[x3]), post test _b[ratio1] = _b[ratio2] Hi, I want to use nlcom to calculate a value using the results of a regression model. Am I doing something wrong, or why this contradiction? And can I trust that the global p-value=0. Is there a way to know whether the the estimates are due to chance?. Dec 1, 2021 · Your -predictnl- and -nlcom- commands are predicting a different statistic from what -margins- is calculating. Can anyone tell me how to add The Delta Method in Stata: nlcom Stata’s procedure nlcom is a particularly versatile and powerful implementation of the delta method. Stata does not have an o cial command for the Baron & Kenny approach, which simply consists in estimating regression models and combining coe cients (easily done with lincom and nlcom). There are two ways we can do this: 1) Using delta method standard errors via nlcom, or 2) using bootstrap standard errors. A recent encounter with an inquisitive reviewer has changed that. I have used the delta method occasionally for years without really understanding what is going on under the hood. Dear Stata Users, I would like to use etable to collect some results from several nlcom commands and turn them into a nice table. nlcom—Nonlinearcombinationsofparameters. The transform-the-endpoints method, however, gives valid coverage only when the transformation is monotonic. Each coefficient in the sureg model is identified in nlcom using both the equation name (generally the response variable for that equation) and the predictor name. Can anyone tell me how to add significance stars and change the row label from "_nl_1" to something nicer? Feb 6, 2010 · Stata delivers everything you need for reproducible data analysis—powerful statistics, visualization, data manipulation, and automated reporting—all in one intuitive platform. 351 is correct? nlcom命令的问题,请教：方程是:y=a*x1+b*x2+c*x3+d*x4+e*x5如果要对系数估计量的非线性组合进行点估计、显著性水平和标准差估计等，用了nlcom命令，但发现一个问题，例如估计以下系数的非线性组合：b-2*c*e/d, stata估计出的系数怎么与我用手直接算出来的结果不一样呢？非常感谢您的解答！,经管之家 (原 Description nlcom is a postestimation command for use after sem, gsem, and other Stata estimation commands. Jul 24, 2025 · The course will give a thorough introduction to the software Stata. 57); p-value<0. Can anyone tell me how to add significance stars and change the row label from "_nl_1" to something nicer? Is there a way to estimate a nonlinear combination with nlcom, when the error `expression too long' is displayed? For the normal based approach we use the nlcom command to compute the conditional indirect effects and their standard errors. Nov 16, 2022 · Stata installation guide for Windows Stata or StataNow We show screenshots and instructions for StataNow, but any differences if you do not have StataNow are slight and will not cause confusion. I thank my coauthor, Hugo Oriola, for showing me how lincom functions. How would I be able to call the regression coefficients from previous regressions to run this test? The transform-the-endpoints method, however, gives valid coverage only when the transformation is monotonic. Can anyone tell me how to add significance stars and change the row label from "_nl_1" to something nicer? The transform-the-endpoints method, however, gives valid coverage only when the transformation is monotonic. Can my copy of Stata run on both my Windows desktop and Mac laptop? Yes. nlcom uses a more general and asymptotically equivalent method for calculating confidence intervals, as described in Methods and formulas. When I input the model in stata 13 I get the estimates for the RE parameters. sem, coeflegend Structural equation model Number of obs = 200 Jul 31, 2024 · I would like to use etable to collect some results from several nlcom commands and turn them into a nice table. nlcom computes point estimates, standard errors, test statistics, significance levels, and confidence intervals for (possibly) nonlinear combinations of parameter estimates after any Stata estimation command. Mar 4, 2025 · Learn Stata Stata resources from UCLA A variety of tutorials, learning modules, recommended resources, and FAQs to help you learn Stata. ers. Although they are estimates I wanted to see stata has a mechanism to have corresponding p-values. Eg. From Bates' post it seems that the p-values won't provide a substantive interpretation. Stata (/ ˈsteɪtə /, [2] STAY-ta, alternatively / ˈstætə /, occasionally stylized as STATA [3][4]) is a general-purpose statistical software package developed by StataCorp for data manipulation, visualization, statistics, and automated reporting. Visit the Stata/MP details page for more information. nlcom uses the delta method to obtain the standard errors. As a post-estimation command, nlcom accepts symbolic references to model parameters and computes sampling variances for their linear and non-linear combinations and transformations. Feb 4, 2026 · Open Stata, and type in and run the example code yourself. As it turned out, the delta method is even more useful than sliced bread, and much healthier. for ratio 2: RR=1. I then want to use nlcom to multiply that value by the constant from a I use the nlcom command for that, however the p-values following the nlcom are quite contradicting to the 95%CIs. This will help you retain more, and ensure you get all the details right—Stata is always happy to tell you when you’re wrong. See [R] n Stata gives you the estimation output where you can check the basic results such as overall significance, and significance of individual explanatory variables. Feb 23, 2025 · In this post, I will show how to use some postestimation tools in Stata to test linear combination of coefficients with interactions terms between two continuous variables. I am interested in doing some post-estimation checks using the nlcom command. Using nlcom Before we begin using nlcom, let’s rerun sem with the coeflegend option to keep the names of the coefficients straight. 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