calculate_mean | R Documentation |
Get the mean, sd and maximum difference value of the measurements/observations made by a single observer across multiple subjects
calculate_mean(measures, index = NULL)
calculate_sd(measures, index = NULL)
calculate_max(measures, index = NULL)
measures |
A vector of measurements/observations made by a single observer across multiple subjects |
index |
A character vector with length equal to 'measures' specifying the factors to be used to group the measurements/values into before applying the summary function. For a single observer, this will tend to be the type of measurement made if 'measures' is a vector of measurements/observations of different types e.g., weight and height. This is *optional* and is set to NULL by default. This would indicate that the summary metrics will be made for the values in 'measures' without any grouping. |
A numeric value for the summary measure of measurements/observations if 'index' is NULL. A named numeric vector for the summary measure of measurements/observations grouped by the factor specified by 'index'
## Get the mean of weight measurements by observer 0 (supervisor) from the
## smartStd dataset
x <- smartStd[smartStd$observer == 0, ]
calculate_mean(c(x$weight1, x$weight2))
## Get the mean weight, height and muac measurements by observer 0 from the
## smartStdLong dataset
x <- smartStdLong[smartStdLong$observer == 0, ]
calculate_mean(x$measure_value, x$measure_type)
## Get the sd of weight measurements by observer 0 (supervisor) from the
## smartStd dataset
x <- smartStd[smartStd$observer == 0, ]
calculate_sd(c(x$weight1, x$weight2))
## Get the sd of weight, height and muac measurements by observer 0 from the
## smartStdLong dataset
x <- smartStdLong[smartStdLong$observer == 0, ]
calculate_sd(x$measure_value, x$measure_type)
## Get the max difference of weight measurements by observer 0 (supervisor)
## from the smartStd dataset
x <- smartStd[smartStd$observer == 0, ]
calculate_max(abs(x$weight1 - x$weight2))
## Get the max difference of weight, height and muac measurements by observer
## 0 from the smartStd dataset
x <- smartStd[smartStd$observer == 0, ]
calculate_max(c(abs(x$weight1 - x$weight2),
abs(x$height1 - x$height2),
abs(x$muac1 - x$muac2)),
c(rep("weight", 10), rep("height", 10), rep("muac", 10)))
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