I am having the trips data and want to develop the model for trip generation.
Depends on the purpose of the research. Are you looking to describe the average behaviour/effects? Or will you be wanting to detect minority behaviour/effects?
You can use sample size calculator http://www.surveysystem.com/sscalc.htm
Before using the sample size calculator, there are two terms that you need to know. These are: confidence interval and confidence level.
Dear Patel
In this case, you have a finite population and you can determine the suitable sample size by using the following Slovin formula or using the attached table .
n= N / ( 1+ N* e^2 )
where : n = sample size
N = population size
e= margin of error
Good luck
Thanks to ALL ...Ali Jafri,
Khalid Hassan ,James Renwick Beattie,Alexander Egoyan...who reply my answer in due time.
Dear RG colleague,
Determining the sample sizes involve resource and statistical issues. Usually, researchers regard 100 participants as the minimum sample size when the population is large. However, In most studies the sample size is determined effectively by two factors: (1) the nature of data analysis proposed and (2) estimated response rate.
For example, if you plan to use a linear regression a sample size of 50+ 8K is required, where K is the number of predictors. Some researchers believes it is desirable to have at least 10 respondents for each item being tested in a factor analysis, Further, up to 300 responses is not unusual for Likert scale development according to other researchers.
Another method of calculating the required sample size is using the Power and Sample size program (www.power-analysis.com).
Regards,
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