Martina Morris
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View article: Improving and Extending STERGM Approximations Based on Cross-Sectional Data and Tie Durations
Improving and Extending STERGM Approximations Based on Cross-Sectional Data and Tie Durations Open
Temporal exponential-family random graph models (TERGMs) are a flexible class of models for network ties that change over time. Separable TERGMs (STERGMs) are a subclass of TERGMs in which the dynamics of tie formation and dissolution can …
View article: Partnership types and coital frequency as predictors of gonorrhea and chlamydia among young MSM and young transgender women
Partnership types and coital frequency as predictors of gonorrhea and chlamydia among young MSM and young transgender women Open
Background Sexually transmitted infections pose a major public health challenge in the United States and this burden is especially acute in subpopulations like young men who have sex with men (YMSM) and young transgender women (YTW). Yet, …
View article: Improving and Extending STERGM Approximations Based on Cross-Sectional Data and Tie Durations
Improving and Extending STERGM Approximations Based on Cross-Sectional Data and Tie Durations Open
Temporal exponential-family random graph models (TERGMs) are a flexible class of models for network ties that change over time. Separable TERGMs (STERGMs) are a subclass of TERGMs in which the dynamics of tie formation and dissolution can …
View article: <b>ergm</b> 4: New Features for Analyzing Exponential-Family Random Graph Models
<b>ergm</b> 4: New Features for Analyzing Exponential-Family Random Graph Models Open
The ergm package supports the statistical analysis and simulation of network data. It anchors the statnet suite of packages for network analysis in R introduced in a special issue in Journal of Statistical Software in 2008. This article pr…
View article: Improving and Extending STERGM Approximations Based on Cross-Sectional Data and Tie Durations
Improving and Extending STERGM Approximations Based on Cross-Sectional Data and Tie Durations Open
Temporal exponential-family random graph models (TERGMs) are a flexible class of models for network ties that change over time. Separable TERGMs (STERGMs) are a subclass of TERGMs in which the dynamics of tie formation and dissolution can …
View article: Comparing Sexual Network Mean Active Degree Measurement Metrics Among Men Who Have Sex With Men
Comparing Sexual Network Mean Active Degree Measurement Metrics Among Men Who Have Sex With Men Open
Background Mean active degree is an important proxy measure of cross-sectional network connectivity commonly used in HIV/sexually transmitted infection epidemiology research. No current studies have compared measurement methods of mean deg…
View article: ergm 4: Computational Improvements
ergm 4: Computational Improvements Open
The ergm package supports the statistical analysis and simulation of network data. It anchors the statnet suite of packages for network analysis in R introduced in a special issue in Journal of Statistical Software in 2008. This article pr…
View article: Comparing Sexual Network Mean Active Degree Measurement Metrics among Men who have Sex with Men
Comparing Sexual Network Mean Active Degree Measurement Metrics among Men who have Sex with Men Open
Background Mean active degree is an important proxy measure of cross-sectional network connectivity commonly used in HIV/STI epidemiology research. No current studies have compared measurement methods of mean degree using cross-sectional s…
View article: Approximations for STERGMs Based on Cross-Sectional Data
Approximations for STERGMs Based on Cross-Sectional Data Open
Temporal exponential-family random graph models (TERGMs) are a flexible class of network models for the dynamics of tie formation and dissolution. In practice, separable TERGMs (STERGMs) are the subclass most often used, as these permit es…
View article: Impact of survey design on estimation of exponential-family random graph models from egocentrically-sampled data
Impact of survey design on estimation of exponential-family random graph models from egocentrically-sampled data Open
Egocentric sampling of networks selects a subset of nodes ("egos") and collects information from them on themselves and their immediate network neighbours ("alters"), leaving the rest of the nodes in the network unobserved. This design is …
View article: ergm 4: New features
ergm 4: New features Open
The ergm package supports the statistical analysis and simulation of network data. It anchors the statnet suite of packages for network analysis in R introduced in a special issue in Journal of Statistical Software in 2008. This article pr…
View article: ergm 4.0: New features and improvements
ergm 4.0: New features and improvements Open
The ergm package supports the statistical analysis and simulation of network data. It anchors the statnet suite of packages for network analysis in R introduced in a special issue in Journal of Statistical Software in 2008. This article pr…
View article: HIV and Sexually Transmitted Infection Epidemic Potential of Networks of Men Who Have Sex With Men in Two Cities
HIV and Sexually Transmitted Infection Epidemic Potential of Networks of Men Who Have Sex With Men in Two Cities Open
Background: The speed with which a pathogen circulates in a sexual network is a function of network connectivity. Cross-sectional connectivity is a function of network features like momentary degree and assortative mixing. Temporal connect…
View article: A Behavioral Cascade of HIV Seroadaptation Among US Men Who Have Sex with Men in the Era of PrEP and U = U
A Behavioral Cascade of HIV Seroadaptation Among US Men Who Have Sex with Men in the Era of PrEP and U = U Open
View article: Temporal Variation in One-Time Partnership Rates Among Young Men Who Have Sex With Men and Transgender Women
Temporal Variation in One-Time Partnership Rates Among Young Men Who Have Sex With Men and Transgender Women Open
Background: Volatility in sexual contact rates has been recognized as an important factor influencing HIV transmission dynamics. One-time partnerships may be particularly important given the potential to quickly accumulate large number of …
View article: A behavioral cascade of HIV seroadaptation among US men who have sex with men in the era of PrEP and U=U
A behavioral cascade of HIV seroadaptation among US men who have sex with men in the era of PrEP and U=U Open
Seroadaptive behaviors help to reduce HIV risk for some men who have sex with men (MSM), and have been well documented in a range of MSM populations. Advancements in biomedical prevention have changed the contexts in which seroadaptive beh…
View article: Prevalence of HIV Infection Among Young Adults in the United States: Results From the Add Health Study
Prevalence of HIV Infection Among Young Adults in the United States: Results From the Add Health Study Open
Objectives. We estimated HIV prevalence rates among young adults in the United States.
View article: Temporal variation in one-time partnership rates among young men who have sex with men and transgender women
Temporal variation in one-time partnership rates among young men who have sex with men and transgender women Open
Background Volatility in sexual contact rates has been recognized as an important factor influencing HIV transmission dynamics. One-time partnerships may be particularly important given the potential to quickly accumulate large number of c…
View article: The HIV/STI Epidemic Potential of Dynamic Sexual Networks of Men Who Have Sex With Men in Atlanta and San Francisco
The HIV/STI Epidemic Potential of Dynamic Sexual Networks of Men Who Have Sex With Men in Atlanta and San Francisco Open
Background The potential speed through which a pathogen may circulate in a network is a function of network connectivity. Network features like degree (number of ongoing partnerships) determine the cross-sectional network connectivity. The…
View article: Key questions for modelling COVID-19 exit strategies
Key questions for modelling COVID-19 exit strategies Open
Combinations of intense non-pharmaceutical interventions (lockdowns) were introduced worldwide to reduce SARS-CoV-2 transmission. Many governments have begun to implement exit strategies that relax restrictions while attempting to control …
View article: Egocentric sexual networks of men who have sex with men in the United States: Results from the ARTnet study
Egocentric sexual networks of men who have sex with men in the United States: Results from the ARTnet study Open
View article: Prevalence of Chlamydial and Gonococcal Infections Among Young Adults in the United States
Prevalence of Chlamydial and Gonococcal Infections Among Young Adults in the United States Open
Context: Chlamydial and gonococcal infections are important causes of pelvic inflammatory disease, ectopic pregnancy, and infertility. Although screening for Chlamydia trachomatis is widely recommended among young adult women, little infor…
View article: Egocentric Sexual Networks of Men Who Have Sex with Men in the United States: Results from the ARTnet Study
Egocentric Sexual Networks of Men Who Have Sex with Men in the United States: Results from the ARTnet Study Open
In this paper, we present an overview and descriptive results from the first egocentric network study of MSM from across the United States (U.S.): the ARTnet study. ARTnet was designed to support prevention research for human immunodeficie…
View article: Effects of Cationic Polyacrylamide and Cationic Starch on Aquatic Life
Effects of Cationic Polyacrylamide and Cationic Starch on Aquatic Life Open
Geotextile tubes with polyacrylamide flocculants are widely used in dewatering applications. Due to variations in solid concentrations during dredging, excess flocculant is sometimes released into the environment, where it might have toxic…
View article: Multilevel network data facilitate statistical inference for curved ERGMs with geometrically weighted terms
Multilevel network data facilitate statistical inference for curved ERGMs with geometrically weighted terms Open
View article: Monitoring HIV Preexposure Prophylaxis Use Among Men Who Have Sex With Men in Washington State: Findings From an Internet-Based Survey
Monitoring HIV Preexposure Prophylaxis Use Among Men Who Have Sex With Men in Washington State: Findings From an Internet-Based Survey Open
Background Many state and local health departments now promote and support the use of HIV preexposure prophylaxis (PrEP), yet monitoring use of the intervention at the population level remains challenging. Methods We report the results of …
View article: Correction: A New Method for Estimating the Number of Undiagnosed HIV Infected Based on HIV Testing History, with an Application to Men Who Have Sex with Men in Seattle/King County, WA
Correction: A New Method for Estimating the Number of Undiagnosed HIV Infected Based on HIV Testing History, with an Application to Men Who Have Sex with Men in Seattle/King County, WA Open
[This corrects the article DOI: 10.1371/journal.pone.0129551.].
View article: <b>EpiModel</b> : An <i>R</i> Package for Mathematical Modeling of Infectious Disease over Networks
<b>EpiModel</b> : An <i>R</i> Package for Mathematical Modeling of Infectious Disease over Networks Open
Package EpiModel provides tools for building, simulating, and analyzing mathematical models for the population dynamics of infectious disease transmission in R. Several classes of models are included, but the unique contribution of …
View article: Biomarkers in Wave III of the Add Health Study
Biomarkers in Wave III of the Add Health Study Open
One of the many unique features of Wave III of the Add Health Study was the collection of biological samples. These biological samples permitted the identification of individuals with sexually transmitted infections [STI] (including HIV), …
View article: EpiModel: An<tt>R</tt>Package for Mathematical Modeling of Infectious Disease over Networks
EpiModel: AnRPackage for Mathematical Modeling of Infectious Disease over Networks Open
EpiModel provides tools for building, simulating, and analyzing mathematical models for the population dynamics of infectious disease transmission in R. Several classes of models are included, but the unique contribution of this software p…