Margin of error

[#1]

Hi,

How to calculate Margin of Error.

Thanks,

[johnw]

Have a look at the sterr() function. It might be what you're looking for.

[#3]

Thanks John,

As for as formula concern,

Margin of error = Critical value x Standard error of the statistic ( sterr() )

Do I need to multiply with the critical value with that function??

Thanks,

[johnw]

tims_qlikview wrote:Do I need to multiply with the critical value with that function?

I'm no statistics expert, but I would assume so. I'm basically just reading Wikipedia and trying hard to remember my one statistics class 20 years ago. You're looking for something like 372 +/- 5, right? You're calling 372 the critical value, and 5 the margin of error, right? The standard error function is returning a percentage, so yes, you'd need to multiply that by the critical value to get the margin of error. And then it's also a question of what margin of error you want. I think that the standard error corresponds to a 68% confidence interval. A 95% confidence interval would be 1.96 standard errors.

[#5]

Yeah, we are calculating 90% Confidence level so it is 1.645.

Thanks,