stata

  1. F

    Problems Fitting Latent Growth Curve Model for BMI

    Hi all, I have a question regarding panel data--collected biennially--from the National Longitudinal Study of Youth. (I use STATA 13.0 for Mac.) I've been trying--and failing--to fit a latent growth curve model for respondent Body Mass Index (BMI). Respondents were empaneled as children...
  2. J

    Gravity model with fixed effects - controlling for the heterogeneity

    Hi Stata users, I'm quite new to Stata and econometric packages in general, so I'd like to get some hints on how to specify a gravity model for international trade between different countries. My panel consists of 133 countries over 19 years - thus we have 17556 combinations of importers (ci)...
  3. M

    Guideline to generate a table of Zero Leverage companies

    Dear all, I'm new to Stata and i'm trying to learn it. I'm currently working on a research about zero leverage companies and i need to generate a table like the one attached. Since it is my first time i'm experiencing some difficulties. [/url][/IMG] Can anyone give me some...
  4. J

    Help with interpreting results of a bivariate probit regression please

    I have recently run this regression using Stata and the command biprobit. However, I am a complete newbie to statistics and I need some help interpreting the results. I am mostly confused by the Rho and Wald Chi2 results. A simple explanation would be much appreciated. I have attached a...
  5. J

    Urgent help- statistically significant mean differences

    My task is to Test whether there are statistically significant mean differences in the log returns between the y stock and the S&P. The data for which is attached. I have to do all of the analysis in Stata. The data is not normal so I need to do a non-parametric test, I think a Ranksum or...
  6. J

    Stats Project - Navigating and using Stata.

    I am currently attempting a statistics project, using stata, my dataset has four variables and I have the following brief. The data can be seen attached. I have posted the questions, and in brackets said how I think I may go about it. I know this is a lengthy post so sorry for that but any...
  7. G

    Leontief Inverse using stata - mata

    Dear all, We can't manage to generate a Leontief Inverse matrix, below an example. Given for example the following matrix converted from stata. A=st_data(.,("a", "b","c", "d", "e","f")) 1 2 3 4 5 6 +-------------------------------+ 1 | 8 4 5...
  8. A

    interactions not allowed

    i am using a fixed effects model with log of wage as the dependent variable when i try xi: xtreg logwage i.d08##c.yrschool exp2 married, i(id) fe where i.d08##c.yrschool is an interaction term with d08 being a dummy for the year 2008 and yrschool being a continuous variable for years of...
  9. B

    Help with hazard function plot

    Hi, I'm looking for help with hazard function plot. Sample of dataset of 1200 obs: ID Age Drugduration Hypertension Event EventDay Censored 1 76 200 1 0 83 1 2 80 180 0 1 214 0 3 85 120 1 0 275 1 I used these codes: ​ stset EventDay, failure(Event) id(ID) stcox Age...
  10. E

    Use of holdout cases generated in SPSS in STATA

    I am working on consumer preferences for fish, using conjoint analysis. My experimental design was generated in spss using orthogonal design, but my analysis has to be done in STATA. I need clarification if STATA will recognize the holdout cases that would have been used to validate the model in...
  11. amsavage

    Generating standardized standard errors

    I am testing a structural equation model using Stata. I need to report standardized direct, indirect and total effects with associated standard errors (effects decomposition). While I can get the standardized effects, Std. Err. are only generated in relation to the unstandardized coefficients...
  12. A

    Matrix Multiplication + Save Result by group

    Bonjour a tous, I'm trying to achieve the following multiplication VAR = W*S*W' w: [n,1] S: [n,n] s: [n,1] I have the following variables in Stata: date W s In my case, S is a square matrix [n,n] with 1 in the diagonal and a constant (per period) "s" in the diagonal. The...
  13. E

    Unique combination of variables

    Hi guys I have 15000 observations across 7 variables. I need some help with the code to generate all possible unique combinations of variables. e.g. if I had 2 variables and 4 observations per variables V1=a,b,c,d V2=1,2,3,4 Then, combinations = a 1, a 2, a 3, a 4,b 1, b 2, b 3, b 4, c 1, c...
  14. A

    STATA - Finance - Portfolio Volatility

    Hi all, I am experiencing difficulties to calculate portfolio volatility each period ("rebalance") given the following variables (enclosed). Correlation ("corr_Nt") across assets ("ticker") remains constant within a period. It is an equally weighted portfolio but weight changes each period (#...
  15. A

    STATA - Finance - Portfolio Volatility

    Statistical package Please refer to the Statistical Package section for this post
  16. A

    Import fixed column data help

    Hi all, I am having trouble structuring my data so that I can import it into Stata using "infix". I cannot delimit my data as there are blanks that indicate missing values. At present my data looks something like this: ID Age Wealth 1 11 21 2 12 (blank) 3 13 23 Number...
  17. S

    If statement braces not producing an output

    Hello and thanks for your help, I am fairly new to Stata and am having issues trying to get the following if statement to run. When I run the "if statement" from my "do file" it simply shows the code without any changes occurring. I found the only way it will run is if I exclude the...
  18. F

    HELP! Coefplot: how to display only certain variables?

    Hi everyone, I want to use coefplot just to display the coefficients of two categorical variables holding for all the others after a reg. I have saved the output of the regression with est store and then I use coefplot...this is the script reg umeat0 i.soclas6 i.titstu1 i.civstat1...
  19. A

    Merging PISA waves in Stata

    I am running into trouble trying to merge multiple PISA waves into one Stata file for running some hierarchical models. So far, I have combined the student and school files, but do not know the best way for merging 2000 through 2012. The problem is further complicated by the fact that...
  20. A

    Comparing proportions in a subgroup to proportions in the overall population

    I am trying to compare the proportion of patients in my subgroup with the outcome of interest to the proportion of patients in the overall population with that outcome, and test for significant difference in order to assess which subgroup variables I should be including in my regression...