Continuous naming

This item includes data and analysis code of the continuous naming experiment.The current code estimates only the linear trends of ordinal postion in several analysis, as it set the ordinal position as a continuous variable. However, the ordinal position can also be contrasted with polynomial contrasts. This is annotated in the current version of code. To conduct polynomial contrast, we can simply remove the # in the corresponding lines in the code. The doc file is another analysis which set the contrast of ordinal position with contr.polynomial(5). This allows us to estimate the linear, quadratic, cubic parameters from the data