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rmeasurementanova

calculate measurement error of morphological measurements in R

I know that to calculate measurement error in need to use an ANOVA, but i'm not sure how to implement in R

Data organised in the following mannder (with last line being a repeat measure):

ID  Wing    Tail    Tarsus  Mid Toe Culmen Depth    Culmen Width
A1  187    124.9    30      27.1    14.4               21
A2  185    130.4    28.5    27.4    13.9              18.5
A3  188    129.7    26.8    26.3    14.3              16.5
A3  189    126      26.9    25.6    13.8              15.9

How would I use an ANOVA in R to calculate percentage measurement error in R?

Thanks

Solution

  • My interpretation of measurement error is based on an estimate of how large are the random deviations in the average of the measured property.

    This error can be estimated by calculating the standard deviation of each property using stats::sd() function and dividing by $\sqrt(n)$ to get the measurement error of the average.