General
PromptBeginner5 minmarkdown
# df$date <- as.Date(df$date
format = %Y-%m-%d)
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General
PromptBeginner5 minmarkdown
cat(sprintf(Duplicate rows: %d\n
n_dup))
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General
PromptBeginner5 minmarkdown
cat_cols <- names(df)[sapply(df
function(x) is.character(x) | is.factor(x))]
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General
PromptBeginner5 minmarkdown
cat(sprintf(\n%s (%d unique):\n
col
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General
PromptBeginner5 minmarkdown
pct_miss = round(colMeans(is.na(df)) * 100
1)
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General
PromptBeginner5 minmarkdown
print(na_report[na_report$n_miss > 0
])
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General
PromptBeginner5 minmarkdown
head(df
10)
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General
PromptBeginner5 minmarkdown
# library(car) # Type II/III ANOVA
VIF
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General
PromptBeginner5 minmarkdown
# library(lmtest) # Breusch-Pagan
Durbin-Watson etc.
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General
PromptBeginner5 minmarkdown
- `adjustcolor(col
alpha.f = 0.5)`: easy way to add transparency.
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General
PromptBeginner5 minmarkdown
# Copy this file
rename it
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General
PromptBeginner5 minmarkdown
- `colorRamp` returns a **function** mapping [0
1] to RGB matrix.
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General
PromptBeginner5 minmarkdown
- `hcl(h
c
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General
PromptBeginner5 minmarkdown
- Must call `dev.off()` to finalize the file. Without it
file may be empty/corrupt.
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General
PromptBeginner5 minmarkdown
- `rgb(r
g
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General
PromptBeginner5 minmarkdown
- `dev.copy(pdf
file = plot.pdf)` followed by `dev.off()` to save current plot.
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Coding & Debugging
PromptBeginner5 minmarkdown
- `arrows`: `code = 1` (head at start)
`code = 2` (head at end
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General
PromptBeginner5 minmarkdown
- `rect(xleft
ybottom
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General
PromptBeginner5 minmarkdown
- `persp(x
y
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General
PromptBeginner5 minmarkdown
- For `image`
`x` and `y` specify **cell boundaries** or **midpoints** depending on context.
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General
PromptBeginner5 minmarkdown
- `contour(x
y
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General
PromptBeginner5 minmarkdown
- Plots columns of one matrix against columns of another. Recycles `col`
`lty`
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General
PromptBeginner5 minmarkdown
- `panel` function receives `(x
y
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General
PromptBeginner5 minmarkdown
- First argument can be an **expression** in `x` or a function: `curve(sin
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