Description Usage Format References Examples

Frequencies of references to previous years in issues of the Frankfurter Allgemeine Zeiting published in 1994.

1 |

A data frame with 800 observations on the following 2 variables.

`Year`

a numeric vector coding years referenced in articles published in 1994.

`Frequency`

a numeric vector for the frequencies with which years are referenced.

Pollman, T. and Baayen, R. H. (2001)
Computing historical consciousness. A quantitative inquiry
into the presence of the past in newspaper texts,
*Computers and the Humanities*, 35, 237-253.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | ```
## Not run:
data(faz)
faz$Distance = 1:nrow(faz)
# ---- visualization
plot(log(faz$Distance), log(faz$Frequency + 1),
xlab = "log Distance", ylab = "log Frequency")
abline(v = log(49), lty=1, col="red") # 1945
abline(v = log(54), lty=1, col="red") # 1940
abline(v = log(76), lty=2, col="blue") # 1918
abline(v = log(80), lty=2, col="blue") # 1914
# ---- breakpoint analysis
deviances = rep(0, nrow(faz)-1)
faz$LogFrequency = log(faz$Frequency + 1)
faz$LogDistance = log(faz$Distance)
for (pos in 1 : (nrow(faz)-1)) { # be patient
breakpoint = log(pos)
faz$ShiftedLogDistance = faz$LogDistance - breakpoint
faz$PastBreakPoint = as.factor(faz$ShiftedLogDistance > 0)
faz.both = lm(LogFrequency~ShiftedLogDistance:PastBreakPoint, data = faz)
deviances[pos] = deviance(faz.both)
}
breakpoint = log(which(deviances == min(deviances)))
# ---- refit and plot
faz$ShiftedLogDistance = faz$LogDistance - breakpoint
faz$PastBreakPoint = as.factor(faz$ShiftedLogDistance > 0)
faz.both = lm(LogFrequency ~ ShiftedLogDistance:PastBreakPoint, data = faz)
plot(faz$LogDistance, faz$LogFrequency,
xlab = "log Distance", ylab = "log Frequency", col = "darkgrey")
lines(faz$LogDistance, fitted(faz.both))
## End(Not run)
``` |

languageR documentation built on May 30, 2017, 3:09 a.m.

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