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Forum: Stata

Stata usage and programming, Stata help

  1. Mann Whitney u test for sample with unequal sample sizes

    Hi I have two samples with unequal sample sizes. Sample 1 have n=90 and sample 2 with n =50. Can I use Mann Whitney u test for comparing these two...

    Started by sk2‎, Yesterday 12:35 PM
    • Replies: 1
    • Views: 101
    Yesterday, 03:29 PM Go to last post
  2. Least Square Dummy Variable Panel Data STATA

    https://www.youtube.com/watch?v=tGkpOlUrxbM The least squares dummy variables (LSDV) estimator is pooled OLS, Fixed Effect, Random Effect STATA....

    Started by willylexander‎, 04-19-2017 05:35 AM
    lsdv data stata
    • Replies: 0
    • Views: 118
    04-19-2017, 05:35 AM Go to last post
  3. Lightbulb Principal component analysis to group items for two different countries

    Hi guys, We are two master thesis students doing our thesis about craft beer. We are performing a principal component analysis to group items from...

    Started by Sidsel Woodley‎, 04-15-2017 11:03 AM
    pca analysis
    • Replies: 0
    • Views: 166
    04-15-2017, 11:03 AM Go to last post
  4. Comparing fixed effects coefficients between two groups

    Dear all, I have estimated a fixed effect panel regression model for two groups in my data set. And I want to test if the coefficients are...

    Started by a_dabch‎, 04-14-2017 02:25 PM
    • Replies: 0
    • Views: 141
    04-14-2017, 02:25 PM Go to last post
  5. discrete time survival analysis

    I would greatly appreciate if you could let me know how to do discrete time survival analysis with time varying covariates. Some part of my data set...

    Started by shebrahimi‎, 04-04-2017 08:31 AM
    discrete-time, survival analysis
    • Replies: 0
    • Views: 283
    04-04-2017, 08:31 AM Go to last post
  6. To convert sas code to stata code

    REQUEST PROFESSIONAL HELP (with financial remuneration for your time) TO CONVERT SAS CODE TO STATA CODE Hello All, I am seeking professional help...

    Started by anwar‎, 04-02-2017 07:44 PM
    sas stata
    • Replies: 1
    • Views: 269
    04-03-2017, 10:53 PM Go to last post
  7. multilevel random effects model

    I want to look at the change in the percentage of income savings measured in dollars using repeated measures data for older adults. I want to compare...

    Started by leonedelman‎, 03-23-2017 07:18 PM
    linear growth curve., multilevel, random effects
    • Replies: 0
    • Views: 428
    03-23-2017, 07:18 PM Go to last post
  8. Age Adjusted Incidence Rates Using Poisson Regression

    Hello, I am not sure how to calculate age-adjusted incidence rates using poisson regression. I am comparing injuries for children at two schools,...

    Started by hannahlibby‎, 03-21-2017 05:57 PM
    adjustment, poisson regression
    • Replies: 0
    • Views: 274
    03-21-2017, 05:57 PM Go to last post
  9. I can't run ado. Message about wrong adopath.

    I installed this package Menu-driven X-12-ARIMA seasonal adjustment in Stata And i also installed the x12a64 package on my PC. Its location is...

    Started by jfca283‎, 04-04-2014 09:55 AM
    • Replies: 4
    • Views: 4,893
    03-11-2017, 02:43 PM Go to last post
  10. How to: xtabond2

    Hello everyone, Me and my group (MSc students) are working on a project on inequality and growth. We have a panel dataset and want to perform...

    Started by Chrysa Pal‎, 03-11-2017 11:28 AM
    • Replies: 0
    • Views: 286
    03-11-2017, 11:28 AM Go to last post
  11. Arellano - Bond estimation: Selection between endogenous and predetermined variables

    Dear colleagues, I hope everything is well. I am running Arellano-Bond estimation (xtabond2) and I would like to ask about the selection of...

    Started by Kostas‎, 03-06-2017 07:39 AM
    • Replies: 0
    • Views: 372
    03-06-2017, 07:39 AM Go to last post
  12. Running sum

    Dear All, I have the following dataset *********************************** clear input rssd9001_bk1 rssd9001_bk2 year dealid obs...

    Started by zaksotiris‎, 03-05-2017 07:56 AM
    • Replies: 0
    • Views: 260
    03-05-2017, 07:56 AM Go to last post
  13. Cox regression time dependent effects

    I have developed a multivariable Cox model including variables associated with mortality using Stata 14.1. I identified a time dependent effect...

    Started by Maddy M‎, 02-23-2017 11:25 AM
    • Replies: 0
    • Views: 823
    02-23-2017, 11:25 AM Go to last post
  14. Dropping observations w.r.t. 2 different variables

    Well, to be honest I do not know how to express my problem so I have uploaded an image. http://imgur.com/JkmzVbV I need a command for Stata to...

    Started by Melih‎, 02-18-2017 10:49 AM
    • Replies: 0
    • Views: 578
    02-18-2017, 10:49 AM Go to last post
  15. sttocc to create a nested case-control study in stata

    Hi all, I am using sttocc to created a nested case control study, within an incident epilepsy population. The commands therefore reads as follows:...

    Started by hayley‎, 02-09-2017 07:37 AM
    nestec case-control study, stata, sttocc
    • Replies: 0
    • Views: 581
    02-09-2017, 07:37 AM Go to last post
  16. Loops and Preserve

    I have this piece of code: gen graph =. preserve forvalues v = 10(1)12 { replace graph = `v' drop if sales`v' == 0 | sales`v' ==. |...

    Started by minnari‎, 01-24-2017 08:28 PM
    • Replies: 0
    • Views: 1,032
    01-24-2017, 08:28 PM Go to last post
  17. How can I calculate the area of ROC curve of a Cox model?

    I have created a Cox regression model on a dataset. Now I want to test its performance with the ROC curves, but I don't find any command in stata to...

    Started by Lore88x‎, 11-16-2012 09:19 AM
    • Replies: 4
    • Views: 6,132
    01-09-2017, 10:54 PM Go to last post
  18. About stci command

    Dear experts, After using stci command, . stci if factorA==0, by(factorB) failure _d: pfsevent analysis time _t: ...

    Started by bestmic‎, 01-02-2017 11:22 AM
    • Replies: 0
    • Views: 1,194
    01-02-2017, 11:22 AM Go to last post
  19. Recursive Partitioning in Stata

    Dear all expert, I am going to review the survival of a group of cancer patients. I would like to explore the potential use of recursive...

    Started by bestmic‎, 12-20-2016 11:42 AM
    • Replies: 2
    • Views: 1,420
    01-02-2017, 09:01 AM Go to last post
  20. Median Survival after multivariate Kaplan Meier Analysis

    Dear experts, I am a newbie. I am performing an KM analysis and obtain the KM curve by the followings: stcox outcome factorA factorB...

    Started by bestmic‎, 01-02-2017 08:57 AM
    • Replies: 0
    • Views: 560
    01-02-2017, 08:57 AM Go to last post
  21. Coding for control variables in Stata 14 in linear regression?

    Hi - I need to control for two variables in my linear regression, the code thus far is; sort dde2 by dde2: regress sustain I have two...

    Started by TruroJP‎, 12-02-2016 05:26 PM
    code, regression, regression analysis, stata, stata 14
    • Replies: 0
    • Views: 1,383
    12-02-2016, 05:26 PM Go to last post
  22. Meta-analysis of diagnostic test using MCMC

    Hi. Is there some good hands-on tutorial about running MCMC analysis for the meta-analysis of diagnostic tests? Is it inbuilt STATA Bayesian analysis...

    Started by Vlajkony‎, 07-16-2016 07:42 PM
    diagnostic test, mcmc, mcmcglmm, meta-analysis
    • Replies: 8
    • Views: 2,240
    11-23-2016, 02:01 AM Go to last post
  23. Hod do I display raw data from bootstrap result in Stata

    Dear all, I have been given the required code to create a bootstrap analysis of the difference in costs between two groups. I now need to see the...

    Started by CE479‎, 10-01-2016 02:34 AM
    • Replies: 1
    • Views: 1,625
    10-03-2016, 03:29 AM Go to last post
  24. gen newvar "3+"

    Amateur stata user here. I have created a new variable ("traumas") that is meant to have categories "%reporting" 0, 1, 2, or 3+ health conditions...

    Started by nazmi1‎, 10-02-2016 08:11 PM
    • Replies: 0
    • Views: 996
    10-02-2016, 08:11 PM Go to last post
  25. How to keep omitted categorical variable on clogit model??

    Currently I am doing choice experiment modelling using conditional logistic model. I am treating all of my attributes as categorical variables....

    Started by ari raka‎, 09-23-2016 07:14 AM
    categorical, choice experiment, clogit, omitted variables, stata 14
    • Replies: 1
    • Views: 1,075
    09-23-2016, 07:44 AM Go to last post
  26. Find corresponding value to extreme score

    Hi, I have data that look something like: id score1 score2 score3 year1 year2 year3 5 90 42 64 2000 2001 2002...

    Started by leonedelman‎, 09-20-2016 06:08 PM
    • Replies: 0
    • Views: 1,177
    09-20-2016, 06:08 PM Go to last post
  27. Graphics of Time Series (tsset command isn't working due to repeated time values)

    Hey everyone, I have a question regarding the creation of graphics for time series. I have two rows with one being the study subject ( 1...

    Started by Sophie Hoffmann‎, 09-13-2016 09:00 AM
    graph, graphics, line graph, time series
    • Replies: 0
    • Views: 945
    09-13-2016, 09:00 AM Go to last post
  28. Thumbs up To computing residuals and predicting values

    Goodafternoon, I am trying to compute residuals. In the first time, I do my regression such as : regress v1 v2 v3 v4 v5 pays_encode1...

    Started by Charlotte63‎, 09-12-2016 08:47 AM
    • Replies: 0
    • Views: 782
    09-12-2016, 08:47 AM Go to last post
  29. Question Help needed!!!How to write STATA code to count the number for the following question?

    I have 5 variables (a1,a2,a3,a4,a5), all of which are categorical and coded as 0=no, 1=yes,98=refuse to report, 99=unknown. I need to calculate the...

    Started by belindalimm‎, 09-07-2016 12:23 AM
    • Replies: 0
    • Views: 774
    09-07-2016, 12:23 AM Go to last post
  30. using wild card for matching string variables

    Hi, I have created a string (pattern) variable containing 0 and 1. For example, a string pattern 0000000011 means the person appears in 10 years of...

    Started by Ujjwal K Das‎, 08-15-2016 03:16 AM
    stata 13, string variable
    • Replies: 0
    • Views: 1,116
    08-15-2016, 03:16 AM Go to last post
  31. String: Pull characters before "-"

    Hi guys, I have a string variable that looks something like this: MMDC-6MA. I need to extract the first letters before the sign "-", So I need...

    Started by Marvin85‎, 08-04-2016 05:13 PM
    • Replies: 0
    • Views: 1,083
    08-04-2016, 05:13 PM Go to last post
  32. Conditional multinomial in STATA - similar to hospital choice models

    Hello, I am having a card time figuring out which conditional logit test to run, and how to structure my data. The set-up is: I am trying to...

    Started by dpac‎, 08-03-2016 03:54 PM
    • Replies: 0
    • Views: 717
    08-03-2016, 03:54 PM Go to last post
  33. mean-test

    Dear colleagues, Im trying to run a mean test (ttest) for the variable satisfaction with life by neighborhoods, however Im considering 3...

    Started by Barreto‎, 07-20-2016 06:50 PM
    • Replies: 1
    • Views: 1,091
    07-20-2016, 07:00 PM Go to last post
  34. Granger Causality and Heteroskedasticity

    Hello! My name is Magdalena and I have the following problem; I have daily returns of 60 firms from the year 2000 to 2015. My aim is to test for...

    Started by magdalenag‎, 07-11-2016 11:51 AM
    granger, heteroskedasticity, stata
    • Replies: 1
    • Views: 1,013
    07-11-2016, 01:54 PM Go to last post
  35. switch x and y axis in a dot graph

    Hello I am new to this forum and stata, but I tried really hard to construct a special dot graph. It would be great if you could help me. I...

    Started by Olivia2‎, 07-03-2016 09:58 AM
    • Replies: 0
    • Views: 978
    07-03-2016, 09:58 AM Go to last post
  36. groups in xtmixed

    Hi all Having some issues with Stata when running xtmixed. The main issue being the number of groups (in initial Group Variable table) is not what...

    Started by gy13her‎, 06-27-2016 07:35 AM
    multilevel models, stata
    • Replies: 0
    • Views: 885
    06-27-2016, 07:35 AM Go to last post
  37. Labelling dummy variables with underlying variable names

    Hey there, I'm very new to Stata and fairly certain this has a simple solution but i don't seem to find it. I have a Dataset with 200 different...

    Started by Chris2291‎, 06-22-2016 09:48 AM
    • Replies: 0
    • Views: 1,091
    06-22-2016, 09:48 AM Go to last post
  38. Bar graph and box-and-whisker plot sorted over binary variable

    Hi, I have a dataset that looks like that below. I want to create graphs like the example below: The variable names var1-var4 in my...

    Started by teapot‎, 06-21-2016 03:00 PM
    • Replies: 0
    • Views: 856
    06-21-2016, 03:00 PM Go to last post
  39. Estimating treatment effect using movestay command

    Hello, I want to use the movestay command in Stata but my data is complicated and Im unsure how to proceed. I would like to estimate the...

    Started by MichielvanRossum‎, 06-05-2016 08:27 AM
    movestay, stata, switching regression
    • Replies: 1
    • Views: 1,847
    06-08-2016, 11:09 AM Go to last post
  40. Write an equation in mata format

    Dear stata users, I am trying to setup the following equation in mata format: C1 + C2*((lnx)^2- C3)+ C4* ((lnx)^2*lnx- C5) I have attached the...

    Started by ledzep‎, 05-29-2016 10:12 AM
    • Replies: 0
    • Views: 1,033
    05-29-2016, 10:12 AM Go to last post
  41. Marginal effects after logistic

    I have all binary/categorical variables, and I am trying to decide between mfx/margins to obtain marginal effects in Stata. They seem to provide...

    Started by oncearunner‎, 04-14-2016 12:41 PM
    logistic regression stata, marginal effects
    • Replies: 2
    • Views: 1,267
    05-28-2016, 07:07 AM Go to last post
  42. svyset

    Hi, I have a database in which there are patients. Sample size is 1000. (100% response due to spare sample/replacement etc) 20 GPs were involved....

    Started by Drone999‎, 05-26-2016 08:18 AM
    survey analysis, survey weights
    • Replies: 0
    • Views: 827
    05-26-2016, 08:18 AM Go to last post
  43. Overlaying two histograms/lines?

    Hi all! I am going nuts in trying to do a graph which to me looks like the basic graph ever. Basically I have two variables: the score that the...

    Started by belfagor71‎, 06-25-2013 06:00 AM
    • Replies: 5
    • Views: 11,633
    05-25-2016, 09:32 AM Go to last post
  44. Pre and post with control: Difference in median

    I created the difference between pre and post UOF counts and then generate a variable that represents the median for each group. base on my...

    Started by Marvin85‎, 05-17-2016 04:01 PM
    median difference
    • Replies: 7
    • Views: 1,389
    05-19-2016, 11:51 AM Go to last post
  45. Stata: Drop company if last stock value of prior year is smaller than a certain value

    Hey all, I have a CRISP dataset with daily stock values for campanies from the first of december 2010 until the end of 2011. Now I need to...

    Started by Prometheus94‎, 05-15-2016 10:32 AM
    • Replies: 0
    • Views: 800
    05-15-2016, 10:32 AM Go to last post
  46. regression OLS e IV

    I need estimate a model specification by OLS and a model IV and endogeneity (cross-sectional data). When I try to estimate OLS, the standard errors...

    Started by Carla VN‎, 05-13-2016 02:25 PM
    • Replies: 0
    • Views: 769
    05-13-2016, 02:25 PM Go to last post
  47. Problem Logistic regression

    Hi, I want to do a logistic regression on proportional data in Stata that I've done with R before. So in R I used cbind to combine the two rows...

    Started by Buckyball‎, 05-10-2016 08:20 AM
    • Replies: 0
    • Views: 876
    05-10-2016, 08:20 AM Go to last post
  48. Help making a basic but large table in Stata

    Thanks for reading :wave: I am a beginner :confused: and trying to make descriptive tables. I am trying to create an 18x18 cross-table. The 18...

    Started by statakiss‎, 04-27-2016 03:51 AM
    big data in stata, cross tabulation, table
    • Replies: 0
    • Views: 1,089
    04-27-2016, 03:51 AM Go to last post
  49. Stata: Test that the difference between two groups = -1

    Does anyone know how to test the hypothesis that the difference between people without and with kids = -1 per night in Stata? I have the data set...

    Started by hbossut‎, 04-23-2016 01:42 PM
    alternative hypothesis, hypothesis, null hypothesis, stata, test
    • Replies: 0
    • Views: 929
    04-23-2016, 01:42 PM Go to last post
  50. Moved: Graphically check linearity in logit regression

    Started by Phaedrus‎, 07-21-2014 07:50 AM
    • Replies: -
    • Views: -
    04-19-2016, 10:59 AM Go to last post
  51. Regression with missing data

    Hi all So I just want to do a quick linear regression, but when I initially tried I had an error (r(2000 no observations). I've realised my issue...

    Started by gga10hr‎, 04-15-2016 01:53 PM
    linear regression, missing values
    • Replies: 1
    • Views: 992
    04-15-2016, 02:18 PM Go to last post
  52. Matrix multiplication operation in stata

    Hi I declared the following matrix mat p_h1=J(22,3,.) that contains some numbers. And now i need this simple task. Create another matrix with the...

    Started by jfca283‎, 04-12-2016 11:09 AM
    • Replies: 0
    • Views: 886
    04-12-2016, 11:09 AM Go to last post
  53. Drop duplicates by criteria :confused:

    Hello, i want to drop duplicates, but using a criteria. For example i am working with a dataset who has id for a lot of student, but the same student...

    Started by Banana_fish‎, 04-11-2016 06:15 PM
    • Replies: 0
    • Views: 932
    04-11-2016, 06:15 PM Go to last post
  54. Can the if option of xtreg unbalance Panel Data?

    Hi everyone, I have a tricky question regarding the way xtreg works. It amy also be a very simple question Using a balanced Panel Data with 10...

    Started by Alexandra 82‎, 04-03-2016 10:16 AM
    balanced data, unbalanced data, xtreg
    • Replies: 1
    • Views: 1,350
    04-04-2016, 02:47 AM Go to last post
  55. Latent Class Analysis with Stata

    Hi, Have anyone used Stata for Latent Class Analysis? I want to estimate willingness to pay with it, but I'm not sure it is possible with this...

    Started by jsuazo‎, 06-14-2013 10:55 AM
    2 Pages
    1 2
    lca, stata
    • Replies: 20
    • Views: 19,585
    04-01-2016, 02:18 PM Go to last post
  56. no observations r(2000)

    Dear all, I have just started using Stata for a time series analysis. However, there has already been to much failure before even started the acutal...

    Started by beckham-7‎, 10-25-2011 04:30 AM
    • Replies: 4
    • Views: 14,293
    03-31-2016, 01:21 PM Go to last post
  57. generating average with missing more than X values

    hi all, let's say i want to take the average of 5 scores for class tests for each student in a class. the data looks like the below EXCEPT...

    Started by bvowe‎, 01-05-2016 10:59 AM
    average, data, stata
    • Replies: 3
    • Views: 1,379
    03-30-2016, 10:52 AM Go to last post
  58. Extrapolation methods book

    Can someone recommend me some good book about extrapolation (ideally with STATA) which do not cover only survival but also extrapolations of other...

    Started by Vlajkony‎, 03-27-2016 11:10 AM
    • Replies: 1
    • Views: 1,853
    03-27-2016, 05:22 PM Go to last post
  59. Unhappy How program a Propensity Score Matching?

    Hello I need to "program" a Propensity Score Matching, but using only loops and not pscore or other command, my problem is that i dont now how...

    Started by Banana_fish‎, 03-16-2016 10:44 AM
    • Replies: 1
    • Views: 1,286
    03-16-2016, 11:53 AM Go to last post
  60. Adding up values of variables

    Hey guys, I got a rather complicated problem: I have two variables, ID and Country ID Country 11 US 11 ...

    Started by Andreas Hofer‎, 03-10-2016 10:59 AM
    calculation, stata, variable
    • Replies: 0
    • Views: 1,264
    03-10-2016, 10:59 AM Go to last post

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