Some of her stimuli presented a message with no prior context (it wasn't a reply to another text message) and asked her respondents what they thought the missing pronoun was: was it I, you, he, she, it, we, you (plural) or they? These were sentences like Might watch a film later. We expected that the majority of people would choose I, because that's what we know null subjects most commonly refer to in English, probably because it's the most accessible referent (you're more likely to be talking about yourself than someone else). But we also thought that there would be some variation, as it's perfectly possible that it could refer to someone else.
Here are the results for Swedish:
Mostly I (jag), as expected, with a smattering of the others, mostly He and She. Funnily enough, there are quite a few more participants who went with he when the sentence was about having broken a mirror - perhaps because boys are clumsy?
And here are the results for English: