<prompt> Translate the following text to SwahiliLongitudinal Data Sometimes called time series data, observations collected over a period of time; the sample instances or cases may or may not be the same each time.  <response>: Longitudinal data ni data ya mfululizo wa muda, ambayo ni pamoja na uchunguzi wa muda mrefu, na sampuli ya sampuli inaweza kuwa sawa au isiyo sawa kila wakati. 