Tag Archives: confidence interval

Confidence Interval for Odds Ratio calculation in TI Nspire

In comparing the relative odds of an outcome, odds ratio is often used and can be easily calculated after constructing the frequency table as in below where the row-wise values represent the treatment and column-wise as the outcome.
oddsratio-ci1

Even though there is no built-in function for the calculation for the confidence interval of odds ratio in TI Nspire, doing it in the Calculator page is pretty straight forward.

oddsratio-ci2

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Confidence Interval calculation in TI Nspire and Excel

In TI Nspire, calculation of Student’s t confidence interval can be achieved using data or statistics input. The menu can be accessed from “Statistics > Confidence Interval > t Interval”.
t-confidenceinterval1

In Excel, the same function does not have a separate menu item, but instead is included in the Descriptive Statistics dialog with a check box of “Confidence Level for mean”, and a percentage input box next to it. Unlike in Nspire, lower and upper are not included in the output.
t-confidenceinterval3