# stata

1. ### How to interpret relationship between variables when one value has a disproportionate number of samples

Hello all! I am in the beginning of a statistics project in my master's course which will be focusing on regression analysis later on. We have not yet done any regression analysis but have been asked to turn in a paper on initial findings and analysis, but I am having a lot of trouble in how I...
2. ### Stata project JOB CASH WORK

Hi, I am new on this forum and completely new to stata. PROJECT FOR MONEY Nevertheless, I am supposed to prepare a small project about alcohol consumption (in a couple countries - any) based on a couple variables like sex, type of alcohol, country, tax, GDP, etc. The project should consist of...
3. ### Help with stats work

Hi everyone at Talk Stats, I've really been struggling on the correct method to use to prove/disprove if my results are statistically significant. For the context in 2006/07, the UK tuition fees have changed from £1k to £3k and then again in 2012 to £9k. Attached is a text file of my collected...
4. ### Difference in Difference Method

Hi guys! For some research we ran a regression analysis in Stata using the Difference in Difference method. this method uses a controlling group of countries to neutralise other effects than the effect of change in regulations. Afterwards we manipulated the data deviding it through year 2011...
5. ### Difference-in-differences in Health Economics Research

Hi, I'm doing a difference-in-differences analysis of a health policy intervention. Health clinics are paid for the percentage of eligible patients who they give the right treatment to. The clinics are measured/paid separately for each type of treatment indicator. One year, some of the...
6. ### Create a dummy conditional on two other variables

Hello there, I have data on European Union membership in the form of a dummy variable were eu_o = Origin is a member, eu_d=Destination is a member. I want to create another dummy variable that takes the value of 1 if both eu_o=eu_d=1. Is there a command to do this?
7. ### VAR Model Lag Length

Ba I intend on estimating a reduced form VAR but I am struggling to choose a lag length. Initially my variables all contained a unit root but I first differenced them in order to induce Stationarity. Based on my estimation sample, the FPE, AIC, HQIC picked 4 lags while the SBIC chose 1 lag. I...
8. ### Logistic Regression Stata: ommitted due to collinearity ?? Help

Hi there, I'm an MSc student in Medical Entomology and I'm in the midst of analysing data for my final project write up. My project is assessing the efficacy of different insecticide treatments applied in experimental huts against malaria mosquitoes. Now my dependent variables are: mortality...
9. ### Dynamic Panel Data for Financial Markets

Dear all, I am trying to simultaneously estimate three equations using dynamic panel data. In each equation, the dependent variable (say, Y(3)) is a function of the two other dependent variables from that same period (say, X(3) and Z(3)), as well as the lagged values of the same dependent...
10. ### Stata - cross-sectional panel regression

Hello, I want to predict returns of real estate investment trusts (REITs) in excess of the risk-free rate (rf), by using various explanatory variables which are market risk premium, the Fama&French factors and the Carhart momentum factor (MOM). For those not familiar with them; the market risk...
11. ### two-way mixed effects models

I am trying to run a mixed effect model defined as: log(volume) = A + B*time + epsilon and A = A0 + A1*T + epsilonA B = B0 + B1*T + epsilonB The data is tumor volumes in two groups (T = 0 or T = 1) of mice, and each mouse's log(volume) increases linearly in time, but with slopes and...
12. ### STATA Logistic Regression Intepretation

Hi, My dependent variable is goes to college coded 0=No and 1= Yes. I am not sure how STATA reads/ranks the dependent variable....thus I am not sure if I am interpreting correct. Predictor variables overeating status 1=does not overeat (reference) 2=sometimes overeat 3= always overeats and...
13. ### Extrapolation of yhat

Hi, I am using non-linear regression ('nl' function, with independent variable of age) to estimate coefficient with the least sum of the square value (fitted non-linear curve). Later, I was using 'predict yhat' to predict the y-value for my samples with different age groups. However, the...
14. ### 'mixlogit' and 'gmnl' commands not working with binary dataset

Hello, My thesis is about Hybrid choice and multinomial logit. I´m using both commands 'mixlogit' and 'gmnl' in Stata for a dataset that: - Includes 12 choice tasks per person (a total of 81 respondents). - 3 different choices for each choice task - Just one answer must be selected (each...
15. ### Guidance for using propensity score matching in R

I am new to programming as well as econometrics and would like to ask some guidance for learning. I am planning to calculate the effectiveness of a public works scheme in country A. By effectiveness I mean the rate of success by which participants were able to return to the open labour market...
16. ### 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 exclude families that do not have children that are younger than 18. So, the data set should look like this after the exclusion...
17. ### 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: stset censor, failure(case) enter (time entry) id(patid) scale(365.25) set seed 9123456 sttocc, match (gender yob entry_year) n(20) nodots...
18. ### extract first value from multiple columns

i am trying to do this in R. it is equivalent to the stata command rowfirst suppose i have four columns as shown below (T1, T2, T3, T4). I want to create a new column (TX) which contains for each row the first element in columns T1:T4. ID T1 T2 T3 T4 A 0 2 4 5 B . . 6 5 C . 8...
19. ### Interpreting VECM/ ECM result

Hi, I am currently working on a paper where I run a VECM and get significant values. However, I am not quite sure about how to interpret the output and how take the different values and express them with an equation. I run the test in SATA using the vec command Attached is a picture of...
20. ### 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 mediator variables or control variables, gender and ses and I need to remove their effects. Any help greatly appreciated!