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بسم الله الرحمن الرحيم

بسم الله الرحمن الرحيم. An- najah National University. Longitudinal Designs. Prepared by : SALEH SARHAN Supervised by:- Dr. Aidah Abu Elsoud Alkaissi Linkoping University-Sweden An- Najah National University- Palestine. Longitudinal Designs.

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بسم الله الرحمن الرحيم

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  1. بسم الله الرحمن الرحيم An- najah National University

  2. Longitudinal Designs Prepared by : SALEH SARHAN Supervised by:-Dr. Aidah Abu Elsoud Alkaissi Linkoping University-Sweden An- Najah National University- Palestine

  3. Longitudinal Designs A study in which data are collected at more than one point in time over an extended period uses. ( OR) Diachronic study Statistics ,A study that follows the same persons over time, evaluating the effects of one or more variables on a process time .

  4. The defining factors for longitudinal These studies focus on a select group of people or processes and observe how various factors change for them over time. • These studies are multi-dimensional, which means they look at many different aspects of the studied subject rather than focus on one particular area.

  5. types of longitudinal designs. • TREND STUDIES. • COHORT STUDIES . • PANEL STUDIES .

  6. types of longitudinal designs. • --TREND STUDIES are investigations in which samples from a population are studied over time with respect to some phenomenon.

  7. Different samples are selected at repeated intervals, but the samples are always drawn from the same population. Trend studies permit researchers to examine patterns and rates of change over time and to predict future developments. Trend studies typically are based on surveys.

  8. Example of a trend study: Greenfield, Midanik, and Rogers (2000) studied trends in alcohol consumption in the United States over a 10-year period, using data from the 1984, 1990, and 1995 National Alcohol Surveys. They found that rates of heavy drinking had fallen between 1984 and 1990, but had remained unchanged between 1990 and 1995

  9. References Nursing Research Principles and Methods Seventh Edition Chapter 8

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