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A probit model structure, with assumed latent satisfaction utility model in the form of multivariate Gaussian function, was adopted for developing the preference model.
Using a latent-variables SEM, the socioeconomic variable, when assumed latent, can be made directly dependent on a series of wealth-related variables.
In this section we examine the sensitivity of our results to a number of factors: leaving pigs out of the analysis, possible errors in the estimated IP infection dates, and the assumed latent period.
(2) and (3) reduce to (6) (7) where is now a scalar and, because there is only one assumed latent variable, B is identically equal to 0 and.
Vaccine effectiveness estimates for three doses were essentially unchanged when we assumed latent periods of 30, 180, and 365 days (see supplementary tables 4-6 on bmj.com); however, the effectiveness of two doses seemed to increase with assumed latent periods of 180 and 365 days.
Added to the two sources of statistical error already identified, is an error associated with the magnitude of the correlation between the two latent variables, that is, the strength of the association between the two assumed latent scales.
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Note also that the developed ACDE model can be used only with continuous data and is not suitable for binary or ordinal data because, in order to analyze the latter two types of data, the liability model that assumes latent variables that follow some normal distributions is usually used in Behavior Genetics.
In these models, an assumed continuous latent variable θ reflects the trait and every item is identified by thresholds β where a response in one category becomes more likely than a response in an adjacent category.
We assumed putative latent periods of 30, 180, and 365 days based on uncertainties about the timing of immune responses to HPV vaccination and the interval between infection and neoplasia.
We assumed the latent period to be 2 days, based on a study which detected the shedding of H7N9 virus using oropharyngeal swabs in 10/11 chickens 2 days post inoculation (DPI) [ 27] (Pantin-Jackwood, personal communication), (although swabs were not taken between 0 and 2 DPI).
We assumed two latent variables at two different points in time, the construct of resilience as measured by the mean SOC and mean SWE scores and the construct of mental health as measured by the log transformed sub scale scores of the SCL-90-R.
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