It doesn't matter what day of the week I give a test or a quiz on, there will be an inordinate number of students absent. It's gotten out of hand.
Statistics classes, being all seniors, are especially bad at this. So last week I put out the word: the make-up quiz will be inordinately more difficult; so much so, I taunted, that I'll savor giving it. I smiled a lot as I spoke.
Today we had our weekly "block schedule", having only odd-numbered periods. Tomorrow we'll have even-numbered periods. First period is especially bad, what with absences and tardies, but today not a single student was missing or late. Third period was also 100% present. Fifth period I teach a different class andt that class also had a quiz, but no one was absent--and I hadn't even threatened them with a harder make-up quiz!
My third stats class is tomorrow. I'm curious to find out if everyone will be there to take the quiz.
It's clear everyone knows that I meant what I said. Credibility pays dividends.
Update, 2/3/16: The only two students that were absent today have been sick for several days. Everyone else attended classes today. Let me restate that: in two days, I've had only two students miss class.