Tutorial on the using Mixed Models in R

Here is the header and first 10 lines of data from the file cleaned_small_1.csv. (The names of the variables will be read from the header line and have been shortened to a maximum of 7 characters just for legibility here.)

Subject Session Respons RT      Trial   Item    Accur   Task    Freq    N       LexStat
b       2       4       639     2       earn    correct S       H       L       W
b       2       5       596     3       suif    correct S               L       P
b       2       5       407     4       nomad   error   S       L       L       W
b       2       4       432     5       monk    correct S       L       L       W
b       2       4       509     6       gentle  correct S       H       H       W
b       2       5       699     7       lafe    correct S               H       P
b       2       5       990     8       tase    correct S               H       P
b       2       4       430     9       animal  correct S       H       L       W
b       2       5       705     10      swinch  correct S               H       P
b       2       4       566     11      lesson  correct S       H       H       W
...