Percentages are calculated from unrounded numbers. The projections presented in this report are the medium figures in a range of three scenarios — high, medium and low — generated from models commonly used by demographers around the world to forecast changes in population size and composition. The models follow what is known as the cohort-component method, which starts with a baseline population in this case, the current number of Muslims in each country divided into groups, or cohorts, by age and sex.
Methods International Survey Research Pew Research Center regularly conducts public opinion surveys in countries outside the United States as part of its ongoing exploration of attitudes, values and behaviors around the globe.
Such studies pose special challenges when it comes to ensuring the comparability of data across multiple languages, cultures and contexts.
International Survey Methodology View detailed information on our international survey methodology here. Pew Research Center staff are responsible for the overall design and execution of each cross-national survey project, including topical focus, questionnaire development, countries to be surveyed and sample design.
Both primary vendors and local research organizations are consulted on matters of sampling, fieldwork logistics and translation. In addition, Pew Research often seeks the advice of subject matter experts and experienced survey researchers regarding the design and content of its cross-national studies.
Field periods for cross-national studies vary by country, but typically extend from three to six weeks. To the degree possible, Pew Research Center attempts to synchronize field work across countries in order to minimize the chance that major events or developments might interfere with the comparability of results.
In some instances, Pew Research modifies its research strategy in response to key developments. Similarly, following the U. The center strives for samples that cover as much of the adult population as possible, given logistical, security and other constraints.
Coverage limitations are noted in the detailed methods for each country. Examples of populations not covered in Pew Research surveys include: Reported margins of error take into account not only the nominal sample size, but design effects due to clustering and weighting, where applicable.
In the case of both telephone and face-to-face surveys, weighting procedures standardly involve two stages.
The first corrects for unequal selection probabilities, and the second adjusts key socio-demographic distributions — such as gender, age, education — to align as closely as possible with reliable, official population statistics. Learn more about our international survey methods for our spring Global Attitudes survey here.Sample Size Calculator.
This Sample Size Calculator is presented as a public service of Creative Research Systems survey urbanagricultureinitiative.com can use it to determine how many people you need to interview in order to get results that reflect the target population as precisely as needed.
Over the past century, the number of Catholics around the globe has more than tripled, from an estimated million in to nearly billion as of , according to a comprehensive demographic study by the Pew Research Center..
But over the same period, the world’s overall population . Modes of Entry for the Unauthorized Migrant Population. Fact Sheet. By No Author. Nearly half of all the unauthorized migrants now living in the United States entered the country legally through a port of entry such as an airport or a border crossing point where they were subject to inspection by immigration officials, according to new estimates from the Pew Hispanic Center.
vii Health research methodology: A guide for training in research methods INTRODUCTION This is a revised version of an earlier manual on Health Research Methodology and deals with the basic concepts and principles.
Executive Summary This guide to using qualitative research methodology is designed to help you think about all the steps you need to take to ensure that you produce a. Pew Research Center regularly conducts public opinion surveys in countries outside the United States as part of its ongoing exploration of attitudes.