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Hello dear forum members, I am seeking your feedback on the question that I have limited knowledge about (i.e., stochastic modeling). Say, I am working with a variant of standard epidemiological compartment model -- SEIR (Susceptible --> Exposed --> Infected --> Recovered): In my analysis I...

Hello! My goal is to study the effect of new feature introduction by online platform on the ratings reported by platform users for a sample of companies. The newly introduced feature became available to all platform users. Each user could self-select to (a) use the feature, and (b) provide...

Hello! I am studying the association between product quality measured by expert intermediary (overallScore) and that measured by online user rating. In particular, I hypothesize that the aforementioned association is dependent on the longevity of product use. For instance, I would expect a...

Hello everybody! So I came across two studies that test a similar model of reputation and its impact on financial performance in the contexts of US business schools and cancer-treatment hospitals. In case of business schools, while the impact of prominence (think top of mind awareness)...

Hello dear forum members, Using county-level panel data (N = 2500+, T = 3) I aim to examine the associations between multiple biological, socioeconomic, and psychological factors and cancer incidence. There are two outcome measures available for me: (1) cancer incidence rate, IR = (New cancers...

Hello dear forum members, I am conducting a replication study based on the paper by Gao, G. G., Greenwood, B. N., Agarwal, R., & McCullough, J. S. (2015). VOCAL minority and silent majority: How do online ratings reflect population perceptions of quality. MIS Quarterly: Management Information...

Hello dear forum members! I am seeking your guidance with the following issue. So, I am estimating a "classic" difference-in-difference model (using pooled OLS estimator): Y = time + treated + time*treated, where Y is the average Medicare payment (amp) in $. Here is the descriptive...

Hello dear forum members! Currently, I am working on a project that aims to predict a certain cancer-related outcome (y) using a number of control (c) and predictor (X) variables: y(i) = a + c(it) + X(it) + u (1) In Equation (1): y(i) is continuous in nature, data is available only...

Hello dear forum members! I wanted to share with you a couple graphs and seek your wisdom on the insights that I may be omitting. According to theory, there are merits to believe that relationship b/w X and Y is moderated by M. Notably, the relationship between X and M is likely to be...

Hello dear forum members! I am seeking your comments/advises on the following question related to assessing mediation effects. Following the general guidelines by Baron and Kenny (1986): 1. y(it) = a + x(it) + u --> significant impact 2. m(it) = a + x(it) + u (where m -- mediator) -->...

Hello dear forum members, I have the following question in relationship to R geosphere package: So, as per package description (ftp://cran.r-project.org/pub/R/web/packages/geosphere/geosphere.pdf, page 3) — "The default unit of distance is meter; but this can be adjusted by supplying a...

Hello dear forum members, I am seeking you comments on the following issue that I noticed in the project that I am working on. So, in 2014 I collected cross-sectional data to estimate the effect of a number of Internet-related metrics on some performance measure. So, the model was: (1) y(i) =...

Hello everybody! For the purpose of my study I am using an exponential Poisson model with population-averaged (PA) effects, as implemented in Stata's -xtpoisson, pa- command. However, neither of the fit statics (e.g., -LogLikelihood, BIC, or AIC) are appropriate after PA estimation. Are...

Hello dear forum members, Suppose I have the following model: y = a + x1 + x2 + z1 + z2 + z1*z2, where y is exponential, x1-x2 are controls, and z1-z2 are endogenous interacting predictors of interest. Assuming I want to correct for endogeneity using IV approach, what will be the appropriate...

Hello dear forum members, For a time being I had been working with the following model (Stata command format): - xtpoisson y x1 x2 x3 x4 x5, fe- where, y(it) is a count DV, x1-x2(it) are controls, and x3-x5(it) are the predictors of interest, i -- denotes an individual (N = 1750), and t...

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Hello dear forum members, My data include roughly 1,200 *.txt files, where (a) * is a 3 to 7 digit non-consecutive number representing participant's id, and (b) the contents of the file is participant's response -- text ranging from 5 to 500 words. What will be the code to create a single...

Hello dear forum members, My study examines the impact of online (a) reputational status, and (b) reviews on physicians’ performance, as proxied with new patient referrals (non-negative over-dispersed counts). In case of (a), to address the issue of endogeneity in the reputational status...

Hello dear forum members, My study aims to address the question about physician ratings: Do they have an impact on the business value (as proxied with new patient referrals)? The sample is a panel of of U.S. oncologists (N=1,694) observed from 2009 to 2013. The outcome is a count, so for the...

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