hearing: Hearing Loss Data

In ACSWR: A Companion Package for the Book "A Course in Statistics with R"

Description

A study was carried in the Eastman Kodak Company which involved the measurement of hearing loss. Such studies are called as audiometric study. This data set contains 100 males, each aged 39, who had no indication of noise exposure or hearing disorders. Here, the individual is exposed to a signal of a given frequency with an increasing intensity till the signal is perceived.

Usage

data(hearing)

Format

A data frame with 100 observations on the following 9 variables.

Sl_No

Serial Number

L500

Observation for 500Hz in the left ear

L1000

Observation for 1000Hz in the left ear

L2000

Observation for 2000Hz in the left ear

L4000

Observation for 4000Hz in the left ear

R500

Observation for 500Hz in the right ear

R1000

Observation for 1000Hz in the right ear

R2000

Observation for 2000Hz in the right ear

R4000

Observation for 4000Hz in the right ear

References

Jackson, J.E. (1991). A User's Guide to Principal Components. New York: Wiley.

Examples

data(hearing)
round(cor(hearing[,-1]),2)
round(cov(hearing[,-1]),2)
hearing.pc <- princomp(hearing[,-1])
screeplot(hearing.pc,main="B: Scree Plot for Hearing Loss Data")

Example output

      L500 L1000 L2000 L4000 R500 R1000 R2000 R4000
L500  1.00  0.78  0.40  0.26 0.70  0.64  0.24  0.20
L1000 0.78  1.00  0.54  0.27 0.55  0.71  0.36  0.22
L2000 0.40  0.54  1.00  0.43 0.24  0.45  0.70  0.33
L4000 0.26  0.27  0.43  1.00 0.18  0.26  0.32  0.71
R500  0.70  0.55  0.24  0.18 1.00  0.66  0.16  0.13
R1000 0.64  0.71  0.45  0.26 0.66  1.00  0.41  0.22
R2000 0.24  0.36  0.70  0.32 0.16  0.41  1.00  0.37
R4000 0.20  0.22  0.33  0.71 0.13  0.22  0.37  1.00
       L500 L1000  L2000  L4000  R500 R1000 R2000  R4000
L500  41.07 37.73  28.13  32.10 31.79 26.30 14.12  25.28
L1000 37.73 57.32  44.44  40.83 29.75 34.24 25.30  31.74
L2000 28.13 44.44 119.70  91.21 18.64 31.21 71.26  68.99
L4000 32.10 40.83  91.21 384.78 25.01 33.03 57.67 269.12
R500  31.79 29.75  18.64  25.01 50.75 30.23 10.52  18.19
R1000 26.30 34.24  31.21  33.03 30.23 40.92 24.62  27.22
R2000 14.12 25.30  71.26  57.67 10.52 24.62 86.30  67.26
R4000 25.28 31.74  68.99 269.12 18.19 27.22 67.26 373.66

ACSWR documentation built on May 2, 2019, 6:53 a.m.