General
PromptBeginner5 minmarkdownQuality: 24
- panel function receives `(x
y
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Data
PromptBeginner5 minmarkdownQuality: 24
- Formula interface: `pairs(~ var1 + var2 + var3
data = df)`.
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General
PromptBeginner5 minmarkdownQuality: 24
- First argument can be an expression in x or a function: `curve(sin
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General
PromptBeginner5 minmarkdownQuality: 24
- Read-only parameters: cin
cra
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General
PromptBeginner5 minmarkdownQuality: 28
- mtext: line argument positions text in margin lines (0 = adjacent to plot
positive = outward). adj controls horizontal position (0-1).
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General
PromptBeginner5 minmarkdownQuality: 24
- `axis(side
at
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General
PromptBeginner5 minmarkdownQuality: 24
- usr with log scale: contains log10 of the coordinate limits
not the raw values.
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General
PromptBeginner5 minmarkdownQuality: 24
- las: 0 = parallel to axis
1 = horizontal
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General
PromptBeginner5 minmarkdownQuality: 24
- `mgp = c(3
1
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General
PromptBeginner5 minmarkdownQuality: 24
Non-obvious behaviors
gotchas
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General
PromptBeginner5 minmarkdownQuality: 24
- mai (inches)
mar (lines)
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General
PromptBeginner5 minmarkdownQuality: 28
- Setting mfrow/mfcol resets cex to 1 and mex to 1. With 2x2 layout
base cex is multiplied by 0.83; with 3+ rows/columns
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General
PromptBeginner5 minmarkdownQuality: 28
- Lognormal: meanlog and sdlog are mean/sd of the log
not of the distribution itself.
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Data
PromptBeginner5 minmarkdownQuality: 24
- Formula interface: `cor.test(~ x + y
data = df) — note the ~` with no LHS.
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General
PromptBeginner5 minmarkdownQuality: 24
- Returns $estimate
$p.value
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General
PromptBeginner5 minmarkdownQuality: 24
- n argument in r*() functions: if length(n) > 1
uses length(n) as the count
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General
PromptBeginner5 minmarkdownQuality: 24
- Beta: shape1 (alpha)
shape2 (beta) — no mean/sd parameterization.
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General
PromptBeginner5 minmarkdownQuality: 24
- names = TRUE by default
adding 0%
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Data
PromptBeginner5 minmarkdownQuality: 28
- Default bandwidth: bw = nrd0 (Silverman's rule of thumb). For multimodal data
consider SJ or bcv.
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General
PromptBeginner5 minmarkdownQuality: 28
- Nine type options (1-9). Default type = 7 (R default
linear interpolation). Type 1 = inverse of empirical CDF (SAS default). Types 4-9 are continuous; 1-3 are discontinuous.
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Data
PromptBeginner5 minmarkdownQuality: 28
- Default kernel: gaussian. Range of density extends beyond data range (controlled by cut
default 3 bandwidths).
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General
PromptBeginner5 minmarkdownQuality: 24
- method = euclidean (default). Other options: manhattan
maximum
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General
PromptBeginner5 minmarkdownQuality: 28
- prcomp uses SVD (numerically superior); princomp uses eigen on covariance (less stable
N-1 vs N scaling).
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Creative
PromptBeginner5 minmarkdownQuality: 24
- nstart > 1 recommended (e.g.
nstart = 25): runs algorithm from multiple random starts
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