I'm not sure whether typing differs from the written word but as it's a fast, two-handed process that is quite different to the slower, single-handed process of writing, it could well be that a different type of error dominates.
Using language in written form seems to be a dual process. We read words both as an automatic (lexical) process and phonetically where we turn them into sounds using our internal voice. For most people
the lexical process dominates and the phonetic route only comes into play with unusual words, low-frequency homophones (words that sound the same but with different spellings), and mistakes.
Outputting language probably works along the same lines.
I think this is why people who are good at spelling and grammar get so annoyed when people write badly whereas those who write badly themselves say things like, "well what difference does it make as long as people know what you mean?".
Those who read/write well utilise the
lexical route when reading and every time they encounter a mistake (their instead of there etc.) they have to baulk to make sure they're getting the correct meaning where as those who are bad a grammar probably use the
phonetic route most of the time anyway and as they're turning words into sounds before grasping their intended meaning, things like there/their/they're don't make any difference to them. To those people, reading and writing are little different to understanding spoken language.
I think I digressed a bit there

but interesting stuff all the same.
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