Description Usage Arguments Value Notes See Also Examples
View source: R/nlmePredict_RS.R
This function uses results from the NLME model created with nlmeModel
to estimate the reading speed achieved for a specific print size.
1 | nlmePredict_RS(nlme.model, print.size)
|
nlme.model |
The object returned by |
print.size |
A specific value of print size in logMAR |
The function returns a dataframe with a with two variables:
"print_size" -> the print size value passed to the function (in logMAR)
"estimated_reading_speed" -> the reading speed achieved at the specified print size as estimated by the NLME model (in words/min)
The values of print size returned have been corrected for non-standard testing viewing distance.
For more details on the nlme fit, see:\ Cheung SH, Kallie CS, Legge GE, Cheong AM. Nonlinear mixed-effects modeling of MNREAD data. Invest Ophthalmol Vis Sci. 2008;49:828–835. doi: 10.1167/iovs.07-0555.
nlmeModel
to fit MNREAD data using a nonlinear mixed-effect (NLME) modeling
nlmeParam
to estimate Maximum Reading Speed (MRS) and Critical Print Size (CPS) from the NLME model
nlmeCurve
to plot the individual MNREAD curves estimated from the NLME model
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # inspect the structure of the dataframe
head(data_low_vision, 10)
#------
# restrict dataset to one MNREAD test per subject (regular polarity only)
data_regular <- data_low_vision %>%
filter (polarity == "regular")
# run the NLME model for data grouped by subject
## Not run: nlme_model <- nlmeModel(data_regular, ps, vd, rt, err, subject)
#------
# extract reading speed achieved at 1.6 logMAR according to the NLME fit
## Not run: nlmePredict_RS(nlme_model, 1.6)
|
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.