Research methods and study design


Study types

Surveys and questionnaire design

Experimental design

Study planning

Study types

Topic Type Description
Correlation

SPSS Worksheet

R worksheet

R Script

These downloadable resources show how to produce and interpret scatterplots and correlation coefficients.
Correlation Booklet This booklet introduces the different ways to interpret the relationship between two continuous variables, such as using Scatter plots and correlation coefficients. It also discusses how to choose the proper correlation coefficient as well as the test for the correlation. It demonstrates the above methods using SPSS.
Correlation and regression Worksheet On completion of this worksheet you should be able to calculate the equation of a regression line, the correlation coefficient and the coefficient of determination




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Surveys and questionnaire design

Topic Type Description
Sampling distribution

Booklet

To understand what is meant by the terms sample and sampling distribution. To explain the importance of sampling in the application of statistics. To explain the terms point estimate and the term interval estimate. To calculate point estimates of means and variances. To find interval estimates of population parameters for given levels of confidence.
Data collection methods

Webpage

This webpage introduces the four main methods to collect the data, including census, experiment, sample survey and observational study. It then discusses their advantages and disadvantages.
Survey sampling methods

Webpage

This webpage describes the differences between population and sample, and lists a number of possible approaches to take a sample for a survey study.
Bias in survey sampling

Webpage

In survey sampling, bias refers to the tendency of a sample statistic to systematically over- or under-estimate a population parameter.Bias often occurs when the survey sample does not accurately represent the population. This webpage gives examples of different types of bias in the survey sample, and shows how to avoid them.




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Experimental design

Topic Type Description
Experimental design

Booklet

Explain the basic concepts of experimental design. Apply randomized blocks and Latin Square designs. Analyse the results from randomized blocks and Latin Square designs
Experimental design

Webpage

This webpage introduces three aims that a good experiment should achieve, and then gives three examples of different designs.
Introduction to experiments

Webpage

This webpage gives an introduction to the experiments, and describes what kind of experiments are well designed. It also slightly touches on where the confounding may be in an experiment.




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Study planning

Topic Type Description
Multiple linear regression

SPSS worksheet

R worksheet

Script

These resources show how to carry out and interpret the output for multiple linear regression including check all the assumptions
Outliers, Durbin-Watson statistic and interactions in regression

SPSS worksheet

R worksheet

A guide to detecting outliers, the Durbin-Watson statistic and interactions in regression.
Introduction to multiple regression

Webpage

This webpage introduces the multiple regression using the example with two independent variables. It gives brief explanation on the coefficients, R-square etc. At the end of the page, it slightly touches on how to compare two regression models and how to check the assumptions.




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