deliveryPreprocess function

Preprocess Accelerometry Data

This function preprocesses accelerometry data by removing days based on a total activity count (default: less than 5000) or total time with activity (default: less than 10 minutes). Additionally, the function has an option to zeropad truncated days such that that days that do not have a whole day of 1440 minutes of data spanning from 00:00 to 23:59 (default: TRUE).

deliveryPreprocess(df, minLow = 5000, minTime = 10, zeropad = TRUE, ...)

Arguments

• df: A dataframe. The source accelerometry dataset, in dataframe format.
• minLow: Numeric. The minimum total counts of movement for a day to not be removed.
• minTime: Numeric. The minimum number of minutes of activity for a day to not be removed.
• zeropad: Boolean value for truncated days to be zeropadded.
• ...: not used at this time

Returns

The dataframe is returned with days fulfilling the dropping criteria removed and truncated days zeropadded. A new column indicating which day is added to the dataframe.

Details

Function works for dataframes from one or multiple unique trials.

Note

The input dataframe should have the following columns: TimeStamp , axis1 , axis2 , axis3 , vm , where vm is the vector magnitude of axes 1, 2, and 3. Dataframe should also be formatted to 60 second epoch.

Examples

data(deliveryData)

deliveryDataProcessed <- deliveryPreprocess(df = deliveryData)

See Also

deliveryPred

Author(s)

Ryan Moore ryan.moore@vumc.org , Cole Beck cole.beck@vumc.org , and Leena Choi leena.choi@Vanderbilt.Edu