I have a data about the Ufo and now I want to study whether the time will influence the sightings,  I want to divide time in four parts and assumed that the Morning time is as 5:00-7:00, Daytime 7:00-17:00, Evening time 17:00-19:00 and night time is  19:00-5:00. How can I write a code about that? Should I use the if else statement? ... View more