Posts

In this post, we:

• use a GPX file with with geographic information, exported from Strava from one running activity,
• parse and plot the data.

In this post, we:

• use dataset “Labeled raw accelerometry data captured during walking, stair climbing and driving” that is freely available on PhysioNet;

• derive four minute-level summary measures of physical activity – AC, MIMS, ENMO, MAD, AI – from raw accelerometry data using SummarizedActigraphy R package;

• summarize minute-level summary measures across walking and driving activities.

To construct confidence interval for the mean, we often use quantiles of standardized sample mean distribution. Here, I include a list of cases where I’d use quantiles of t-distribution versus quantiles of normal distribution for that purpose.

Note: the below text could be directly translated to answer when to use t-test versus z-test in testing hypothesis about the mean parameter.