# stata

1. ### Stepwise Logit Regression - Drop of variables

Dear All, I have a small question I hope you could help me with. I am trying to find a predictive model for a dataset doing a stepwise logit regression. I have a few variables with info that is included in another variable. E.g. "income" (0-9 with 0=income is missing) and "income...
2. ### Pie chart and percentage Stata

Hello, I'm starting with Stata 13 and I'm trying to make a pie chart with the %s included. I have "press" all the "buttons" but nothing... It`s possible to do?? Somebody knows it?? Thanks!!
3. ### Latent Class Analysis with lclogit and gllamm-wrapper lclogitml

Latent Class Analysis in Stata (llclogit, lclogitml, gllamm) Hi all, I am having trouble fitting a latent class model with Stata. I have a panel data set from an online discrete choice experiment. Each respondent was represented 12 choice sets with 2 alternatives and, therefore, had to...
4. ### ARDL model in STATA

Hi to all, I am also using the ARDL in my model. So I used the varsoc variable to determine the optimum lag for my variables, than I used the ADF to test whether my variables have a unit root or not and also I used the Zivot-Andrews test for structural breaks. Now I am struggling with the...
5. ### how does stata calculate confidence intervals for age standardised means/proportions

Dear Stat Talkers! I'm using the following Stata command (see help mean): mean x, std(a) stdw(b) over(c) to get age-standardised mean or proportion of a variable of interest x. a= variable for age-group and b= variable for weights for each group. x can be a continuous variable or a...
6. ### 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...
7. ### 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)...
8. ### 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...
9. ### 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...
10. ### 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...
11. ### 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...
12. ### 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...
13. ### 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...
14. ### 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...
15. ### 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...
16. ### 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...
17. ### 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...
18. ### 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...
19. ### 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 (#...
20. ### STATA - Finance - Portfolio Volatility

Statistical package Please refer to the Statistical Package section for this post