Nevertheless, when changes over time were assessed within city strata, a statistically significant increase was found for Montevideo (23% in 2008 and 29% in 2010; P = 0.04).
For those schools with enrollment information, a probability proportional to size without replacement was implemented using enrollment for the cumulative total method [ 21], within city strata, school type (private or public), and education level.
Over time differences within city strata (i.e. capital city, other cities) involved pooling data from both survey years and regressing SHS exposure on a dummy variable for survey year, using generalized estimating equations (GEEs) to account for repeated observations of participants surveyed at both waves (Hardin and Hilbe 2003).
Mass violence was buried in the city like strata of rock.
In the city, the strata consists mainly of sandy soil.
For each city (the strata), based on the list of administrative districts, streets and communities, the coordinator of this study randomly sampled two districts and subsequently used simple random sampling to select two streets within each selected district and two communities from each selected street.
Briefly, the cities and counties of the province were classified into four strata (large cities; small to medium cities; class 1 and class 2 rural areas) based on their economic development levels identified by the central government of China.
The country was divided into six strata: large cities, small to medium cities, class 1 rural areas, class 2 rural areas, class 3 rural areas, and class 4 rural areas, according to their economic characteristics and social development.
Briefly, cities and counties in the province were categorized into four strata (namely, large cities, small to medium cities, class 1 rural areas, and class 2 rural areas) based on their level of economic development as identified by the central government of China in 1990s [ 18].
On Dec. 11, at Webster Hall, the two bands provide a cross-section of the city's living strata.
