Is there any data on offering a lower first-months or first-years price on a subscription deal? (i.e. "Pay $2.99 for your first month!" with "$7.99 a month ther

Is there any data on offering a lower first-months or first-years price on a subscription deal? (i.e. "Pay $2.99 for your first month!" with "$7.99 a month thereafter" in smaller print)