2 Making clear the proportion (p) is NOT the p-value
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whenWhen determining sample size we require population proportion (p)proportion (p) for a dichotomous outcome that to be measured (at 95% CI , 3% error ). 

If pthe proportion (p) is unknown a conservative estimate of .5 assumed. sometimes pilot study conducted to find a P value for the proportion (p). If there is previous study we can take P valuevalues for the proportion (p) from there. 

I am studying vaccination pattern among nurses (yes /no). thereThere are three studies where vaccination rate was 47%, 52% and 57% . Now which P value tovalues should I choose for the proportaion (p)? 0.47 or 0.52 or 0.57 or simply i can I simply go for an intermediate 0.5?

Please help

when determining sample size we require population proportion (p) for a dichotomous outcome that to be measured (at 95% CI , 3% error ). If p is unknown a conservative estimate of .5 assumed. sometimes pilot study conducted to find a P value. If there is previous study we can take P value from there. I am studying vaccination pattern among nurses (yes /no). there are three studies where vaccination rate was 47%, 52% and 57% . Now which P value to choose? 0.47 or 0.52 or 0.57 or simply i can go for an intermediate 0.5?

Please help

When determining sample size we require population proportion (p) for a dichotomous outcome that to be measured (at 95% CI , 3% error ). 

If the proportion (p) is unknown a conservative estimate of .5 assumed. sometimes pilot study conducted to find a value for the proportion (p). If there is previous study we can take values for the proportion (p) from there. 

I am studying vaccination pattern among nurses (yes /no). There are three studies where vaccination rate was 47%, 52% and 57% . Now which values should I choose for the proportaion (p)? 0.47 or 0.52 or 0.57 or can I simply go for an intermediate 0.5?

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how to use population proportion to determine sample size?

when determining sample size we require population proportion (p) for a dichotomous outcome that to be measured (at 95% CI , 3% error ). If p is unknown a conservative estimate of .5 assumed. sometimes pilot study conducted to find a P value. If there is previous study we can take P value from there. I am studying vaccination pattern among nurses (yes /no). there are three studies where vaccination rate was 47%, 52% and 57% . Now which P value to choose? 0.47 or 0.52 or 0.57 or simply i can go for an intermediate 0.5?

Please help