mnreadR (version 2.1.7)

readingAcuity: Reading Acuity (RA) calculation

Description

Reading Acuity (RA) is defined as the smallest print size at which one can read without making significant errors. This function measures Reading Acuity to the nearest 0.1 logMAR, while performing print size correction for non-standard testing viewing distance.

Usage

readingAcuity(
  data,
  print_size,
  viewing_distance,
  reading_time,
  errors,
  ... = NULL
)

Value

The function returns a new dataframe with a variable called "RA" that contains the Reading Acuity estimate (in logMAR).

Arguments

data

The name of your dataframe

print_size

The variable that contains print size values for each sentence (print size uncorrected for viewing distance)

viewing_distance

The variable that contains the viewing distance value used for testing

reading_time

The variable that contains the reading time for each sentence

errors

The variable that contains the number of errors for each sentence

...

Optional grouping arguments

See Also

mnreadParam for all MNREAD parameters estimation

curveParam_RT for MRS and CPS estimation using values of reading time (instead of reading speed)

curveParam_RS for MRS and CPS estimation using values of reading speed (instead of reading time)

accIndex for Reading Accessibility Index calculation

Examples

# inspect the structure of the dataframe
head(data_low_vision, 10)

#------

# restrict dataset to one MNREAD test only (subject s1, regular polarity)
data_s1 <- data_low_vision %>% filter (subject == "s1" & polarity == "regular")

# run the reading acuity calculation
data_low_vision_RA <- readingAcuity(data_s1, ps, vd, rt, err)

# inspect the newly created dataframe
data_low_vision_RA

#------

# run the reading acuity calculation on the whole dataset grouped by subject and polarity
data_low_vision_RA <- readingAcuity(data_low_vision, ps, vd, rt, err,
                                    subject, polarity)

# inspect the structure of the newly created dataframe
head(data_low_vision_RA, 10)