A A A
Manual Event (Session ID,DateTime,Event) = erfk50trqit06coarv1q1npn6t 20210804152823 /communities/sample-size-calculation/

Sample size calculation

Share:
Whtasapp
Topic Discussions

Hello! I’m Dr. MEL. Nice to meet you! I’m absolutely excited that we are going to start this beautiful learning journey together and I’m sure you will find it fruitful and fulfilling. Feel free to share your thoughts here!

Recent Activity Discussions

Got questions? Simply post them and let’s discuss! 

Discussion thread: General
casslau
30 October 2019
Sample size calculation

How to calculate sample size for purposive sampling (Non random sampling)? We have 25 factors identified for our evaluation. How to calculate exact sample size for non random sampling?

Reply
Like
Share
Whtasapp
Jason Jiang
20 February 2020

Confidence intervals and standard error rates have no meaning when the sampling (or at least the assignment to test groups) is not random regarding the factors that you want to test.

Reference: https://www.researchgate.net/post/Do_you_know_any_sample_size_calculation_for_nonprobability_purposive_sampling_technique

Replies
Like
Share
Whtasapp
Hobbs
11 February 2020

It is very useful information! thank you!

Replies
Like
Share
Whtasapp
Ng Yuen Hang
30 October 2019

There is no way to estimate sample size when the sample is from non-random sampling. One can only assume the use of random sampling to set the minimum. Typically for any evaluation, the assumption of random sampling suggests a size of 780 cases for an expected weak effect size, 123 for an expected medium effect size, and 46 cases for an expected strong effect size, to achieve 95% in confidence and 80% in statistical power. It thus depends on the weakest effect size expected.

Replies
Like
Share
Whtasapp
Latest Posts
More posts
I want to know more about the positive youth development (PYD) framework, thanks!
I want to know more about the positive youth development (PYD) framework, thanks!
Cathy Lau
4 August 2021
0Replies,0Months ago
Like
Share
Whtasapp
What do you think of the traditional services for homeless youth?
What do you think of the traditional services for homeless youth?
Cathy Lau
4 August 2021
1Replies,0Months ago
Like
Share
Whtasapp
What are the traditional services for homeless youth?
What are the traditional services for homeless youth?
Mike Lee
4 August 2021
3Replies,0Months ago
Like
Share
Whtasapp
I want to know more about the social support resources of homeless young people, thanks!
I want to know more about the social support resources of homeless young people, thanks!
Mike Lee
4 August 2021
3Replies,0Months ago
Like
Share
Whtasapp
Featured Posts
Questions about program evaluation and impact assessment (PE & IA)?
Dear MEL participants, Hello everyone! We are going to meet Prof. Aron Shlonsky this week (17&18 Oct). Do you have any problems or issues in program evaluation and impact assessment? Pleas ...
meladmin
15 October 2019
0Replies,22Months ago
Like
Share
Whtasapp
Question about the programme evaluation
Can someone recommend me a basic guide book for programme evaluation? We are an NGO in mainland China and providing services for young drug abusers in rural China. We learnt about your pro ...
Jessica
9 October 2019
4Replies,22Months ago
Like
Share
Whtasapp
Ask for more information about the logic model
I have watched the cartoon of the logic model and it is really useful for our programme evaluation. May I obtain some further references of the logic model? Thanks!
Marleen
5 October 2019
3Replies,22Months ago
Like
Share
Whtasapp
Seek for advice on Programme evaluation
Hi! We work for the ethical minority group in Hong Kong. The ultimate goal of our organisation is to make changes to public policies, such as to the education system or medical service. We spe ...
Aurielle Lee
2 October 2019
4Replies,22Months ago
Like
Share
Whtasapp