Sample size calculation for cross-sectional study
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- เผยแพร่เมื่อ 25 ก.ค. 2024
- Sample size determination is the act used in research of selecting the number of observations to include in a statistical sample. The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample size used in a study is usually determined based on the cost, time, or convenience of collecting the data. Therefore we calculate minimum sample size using statistical procedure.
#SampleSize
#IntraclusterCorrelationCoefficient
#DesignEffect
#EstimatedPrevalence
#StandardDeviation
Good presentation
It is very helpful. Thank you
Hi Ahshanul,
For the ICC, how do you determine the ICC if there are no previous national survey or pilot study. Is there a place for assuming a conservative value? If yes, what should guide in this decision?
Could you please explain how to calculate the sample size for a judgement sample, I really need help with that!!
How do you calculate the sample size for a judgement sample? Please help!
i have across sectional study which i will use both qualitative and quantitative ways of data collection
Please discuss how weighting is constructed for household of DHS data ??
Is there any design effect for convenience samples sir
What will be the sample size calculation of an analytical cross-sectional study?
Hi, I have a cross-sectional study with four groups (IV) and a few outcome variables that have binary, continuous, and ordinal values (DV). What formula should I use to do the sample size calculation?
It binary, then Proportion, If ordinal then also proportion but have to used as multiple outcome, if continuous the standard deviation
Greetings sir
In case we want select different universities from list like we have 28 list how can I select from which should I collect data ?
Apply yamane formula it returns 26 as sample ?
Hello! This was very helpful! Could you please provide a reference that I can cite in my assignment?
Thank you. Please have a look at the link www.ncbi.nlm.nih.gov/pmc/articles/PMC3895825/
Apple bhai, go ahead!
Thank you so much bhai.
Very helpful sir
❤Q
Good Presentation! Could you please explain how and where did you obtain the value of ICC? If the calculated sample size is greater than what we have (particularly in secondary data, where we have no control over data), what would be best approach to conclude sample size?
Thank you. Generally, icc was calculated from national survey data or other findings. otherwise from pilot study.
Thank you for your reply. I think we cannot use the ICC value we obtained by assessing Inter-rater reliability of a tool in a psychometric study (e.g., DQoL used to measure quality of life ), Can we? Or, do we need to consider the value of ICC, where our independent (e.g., organizational context) and dependent variable of interest (e.g., quality of life) are taken into account? Please suggest.
In the case, where no such studies are identified which looked into association of organizational context with quality of life what would be the best approach to get the value of ICC. Please advise.
@@shovanashrestha2570
Thank you. ICC will be needed for calculating sample size of cluster sampling.
In this situation we use icc from other previous study or from pilot study.
desired precision corresponds to beta value??
Thank you.
beta value is used to calculate sample size for those study based on hypothesis testing.
and precision is used to estimate a prevalence.
why did you choose standard deviation as 1.20? is it just an assumption? or it is considered as standard value to get a certain effect?
Thank you to raise the issue.
This is completely an example.
generally we use from a literature.
@@ahshanulstatistician6644 literature like from national survey? Or from previous articles? I am trying to find sample size for my study.
@@shrutipatil1648
Yes,
national survey or any previous article or study
How to calculate sample size for convinience sampling method in cross-sectional survey sir?
Generally we do not use different formula for non-probability sampling
I need the reference for the formula badly..can you pls help!
Thank you. Please have look at the link
www.ncbi.nlm.nih.gov/pmc/articles/PMC3895825/