Egen calculation, means/sd
Hi everyone, I'm trying to manually calculate a value for each household in a survey. Using three dummy variables in the dataset (X, Y, Z), I'd like to generate a new variable that takes on the...
View ArticleCreating normally distriuted random variable given mean and standard deviation
Hi all I would like to create a random variable (X) with 100 observations. The variable should follow the normal distribution with mean 15 and standard deviation 5. Can anybody suggest a code for this?...
View ArticleDivide a matrix
Hello, How can I devide a matrix by an other matrix (not a division by scalar) ? By the way, I tried : mat xxx = zz * 1/yy , without résult... Thank you for your answer Marc
View Articlehow to create a squared variable in Stata?
Hello folks, I have a age variable and I want to create its square. I would be very grateful if someone could explain me how can I do that. Thank you so much
View ArticleHow to run a quadratic OLS regression?
I have been asked to run a quadratic OLS regression. Do we have such a regression in STATA? I would be very grateful if someone could help me out.
View ArticleDifferent heterogeneity statistics for proportions in the same subgroup using...
Hello, I am running meta-analysis for proportions and tried both -metan- vs -metaprop_one- for subgroup analysis as follows. -metaprop_one- used exact confidence limits for a binomial proportion. The...
View Articletmap/smap USMAPS redundant lines
Dear Statalisters, Although I follow the precise instructions from Maurizio Pisati (one should sort boundary files by _ID, as suggested in p. 9 from...
View ArticleInteraction term
Hello folks, I try to add an interaction term to my model but have no idea how to do that. I was wondering if someone could help me. Thank you so much
View Articlemargins after mlogit beta coefficients
Dear Stata users, I am running a margins command after mlogit. But if I compare the beta-coefficience of mlogit with the dy/dx of margins they don't point in the same directions (different algebraic...
View ArticleError Message Convergence not achieved in etregress before iterations
I'm running etregress in Stata 14. It gives me a "convergence not achieved" message but that occurs before the iteration log. It also says "missing standard errors indicate some of the parameters are...
View ArticleStoring Person-Specific Marginal Effects in a Variable?
Hi Statalist, I am trying to estimate person-specific marginal effects for a structural form equation, and I need a way to save the marginal effects that Stata creates for each person when you run the...
View Articlelooping over dates with formating
I have a bunch of dates reflecting date of joining (DOJ). I want to do a bunch of calculations for each DOJ. Before getting into the calculations I want to display the date through which I am looping...
View ArticleFixed vs. random effects and year dummies
Hi all, I'm currently working on my dissertation using Stata and I'm a little confused. I'm looking to find the determinants of a firm's borrowing source. Regressing debt source/total debt against firm...
View Articlechi2 with clustered data
Hi, I want to calculate a chi2 using clustered data. My two example variables of interest are study timing (dichotomous variable 'timeat3nospan': 1=post-policy; 0=pre-policy) and race (four category...
View ArticleExecuting Mata syntax over several dataset
Hi all. I'm trying to execute a routine over several datasets however, it stops after the first year. The syntax is, local years 2003 2008 2015 foreach i of local years { cd...
View ArticleNhanes
New to statalist.org. Where can I find data dictionaries for importing NHANESIII ASCII public use data from http://www.cdc.gov/nchs/nhanes/nhanes3/data_files.htm? Have some been posted online?
View ArticleCombining Variables Across Observations
Hello all, I wish to collapse(sum) all of the variables in 3 company-year observations with 3 company-year observations of another company in my dataset. I would like the second company to absorb the...
View ArticleSimultaneous equation (reg3) and clustered standard errors
Hi everyone, Does anyone know how to obtain clustered standard errors when using reg3 or sureg? I've looked online and there doesn't seem to be a straightforward solution. Bootstrapping alone does not...
View ArticleSimultaneous Equations (REG3) and Endogeneity Test Result(Hausman Test)
Hi All, I have following set of simultaneous equations: Y = X + A + B + C + D (1) X = Y + E + F + G + H (2) In above equations variables X and Y are endogenous variables. The variables F G and H are...
View ArticleADF-test. My data has a unit-root, now what?
Hello everyone, I have a monthly dataset, time-series, from about 1962 until 2008 where I want to regress the effect of several variables on the federal funds rate. It turns out however, when I perform...
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