I have been read that chi-squares are not appropriate when convenience sampling has been applied. is it true?
Kamila -
The problem with a convenience sample is that everything you try to do with it may be substantially biased. To be "representative" of your population, you most likely need randomized sampling. It is also possible to do well, if you are careful, if you have regressor data, to model your population, but that involves considerations of which you likely are unaware, and based on your question, I doubt would apply. Still, if you have regressor data on the entire population, you may find something on my ResearchGate pages of interest.
You might want to see some of the following, among other sources:
Särndal, CE, Swensson, B. and Wretman, J. (1992), Model Assisted Survey Sampling, Springer-Verlang.
Finite Population Sampling and Inference: A Prediction Approach, 2000, Richard Valliant, Alan H. Dorfman, Richard M. Royall,
Wiley Series in Probability and Statistics.
And for nonprobability sampling in general:
J. Michael Brick on Inference from Nonprobability Sampling:
...............
This may be of interest:
"2014 WSS PRESIDENT’S INVITED SEMINAR,"
http://washstat.org/seminars/2014/20140326_brick.html
In that seminar, Mike Brick addressed a committee report on non-probability sampling of many types:
https://www.researchgate.net/publication/273561892_Summary_Report_of_the_AAPOR_Task_Force_on_Non-probability_Sampling
...............
"The Future of Survey Sampling"
Article in Public Opinion Quarterly 75(5):872-888 · December 2011
Impact Factor: 2.25 · DOI: 10.2307/41345915
https://www.researchgate.net/publication/261967521_The_Future_of_Survey_Sampling
---
"Beyond traditional survey taking: adapting to a changing world
Explorations in Non-Probability Sampling Using the Web," J. Michael Brick
Proceedings of Statistics Canada Symposium 2014
http://www.statcan.gc.ca/sites/default/files/media/14252-eng.pdf
Cheers - Jim.
PS - If you divide your population by some meaningful categories, you may be able to see how results from your convenience sample appear to differ, for categories for which you have a good deal of data.
Article The Future of Survey Sampling
Article Summary Report of the AAPOR Task Force on Non-probability Sampling
Kamila -
The problem with a convenience sample is that everything you try to do with it may be substantially biased. To be "representative" of your population, you most likely need randomized sampling. It is also possible to do well, if you are careful, if you have regressor data, to model your population, but that involves considerations of which you likely are unaware, and based on your question, I doubt would apply. Still, if you have regressor data on the entire population, you may find something on my ResearchGate pages of interest.
You might want to see some of the following, among other sources:
Särndal, CE, Swensson, B. and Wretman, J. (1992), Model Assisted Survey Sampling, Springer-Verlang.
Finite Population Sampling and Inference: A Prediction Approach, 2000, Richard Valliant, Alan H. Dorfman, Richard M. Royall,
Wiley Series in Probability and Statistics.
And for nonprobability sampling in general:
J. Michael Brick on Inference from Nonprobability Sampling:
...............
This may be of interest:
"2014 WSS PRESIDENT’S INVITED SEMINAR,"
http://washstat.org/seminars/2014/20140326_brick.html
In that seminar, Mike Brick addressed a committee report on non-probability sampling of many types:
https://www.researchgate.net/publication/273561892_Summary_Report_of_the_AAPOR_Task_Force_on_Non-probability_Sampling
...............
"The Future of Survey Sampling"
Article in Public Opinion Quarterly 75(5):872-888 · December 2011
Impact Factor: 2.25 · DOI: 10.2307/41345915
https://www.researchgate.net/publication/261967521_The_Future_of_Survey_Sampling
---
"Beyond traditional survey taking: adapting to a changing world
Explorations in Non-Probability Sampling Using the Web," J. Michael Brick
Proceedings of Statistics Canada Symposium 2014
http://www.statcan.gc.ca/sites/default/files/media/14252-eng.pdf
Cheers - Jim.
PS - If you divide your population by some meaningful categories, you may be able to see how results from your convenience sample appear to differ, for categories for which you have a good deal of data.
Article The Future of Survey Sampling
Article Summary Report of the AAPOR Task Force on Non-probability Sampling
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