Data
PromptBeginner5 minmarkdownQuality: 22
│ ├── statistics.md # Hypothesis tests
distributions
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Data
PromptBeginner5 minmarkdownQuality: 22
│ ├── data-wrangling.md # Subsetting traps
apply family
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Coding & Debugging
PromptBeginner5 minmarkdownQuality: 26
I'm a political science PhD candidate who uses R regularly but would never call myself an R person....
without ggplot2
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Writing & Content
PromptBeginner5 minmarkdownQuality: 22
writeLines(template
out_file)
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Data
PromptBeginner5 minmarkdownQuality: 22
boxplot(%s ~ %s
data = df
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Writing & Content
PromptBeginner5 minmarkdownQuality: 22
write.csv(df
%s_clean.csv
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Data
PromptBeginner5 minmarkdownQuality: 22
fit_aov <- aov(%s ~ %s
data = df)
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Data
PromptBeginner5 minmarkdownQuality: 22
fit <- lm(%s ~ %s
data = df)
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Data
PromptBeginner5 minmarkdownQuality: 22
t.test(%s ~ %s
data = df)
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Data
PromptBeginner5 minmarkdownQuality: 22
if (is.null(datafile)) datafile <- paste0(project_name
.csv)
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Data
PromptBeginner5 minmarkdownQuality: 22
check_data <- function(df
topnlevels = 8) {
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Writing & Content
PromptBeginner5 minmarkdownQuality: 22
write.csv(df
data_clean.csv
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Data
PromptBeginner5 minmarkdownQuality: 22
saveRDS(df
data_clean.rds)
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Data
PromptBeginner5 minmarkdownQuality: 22
fitaov <- aov(outcomevar ~ group_var
data = df)
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Data
PromptBeginner5 minmarkdownQuality: 22
t.test(outcomevar ~ groupvar
data = df)
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Data
PromptBeginner5 minmarkdownQuality: 22
abline(lm(outcome_var ~ predictor
data = df)
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Data
PromptBeginner5 minmarkdownQuality: 22
df <- read.csv(your_data.csv
stringsAsFactors = FALSE)
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Coding & Debugging
PromptBeginner5 minmarkdownQuality: 22
- arrows: code = 1 (head at start)
code = 2 (head at end
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Data
PromptBeginner5 minmarkdownQuality: 22
- Formula interface: `pairs(~ var1 + var2 + var3
data = df)`.
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Data
PromptBeginner5 minmarkdownQuality: 22
- Formula interface: `cor.test(~ x + y
data = df) — note the ~` with no LHS.
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Data
PromptBeginner5 minmarkdownQuality: 26
- Default kernel: gaussian. Range of density extends beyond data range (controlled by cut
default 3 bandwidths).
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Data
PromptBeginner5 minmarkdownQuality: 26
- Default bandwidth: bw = nrd0 (Silverman's rule of thumb). For multimodal data
consider SJ or bcv.
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Creative
PromptBeginner5 minmarkdownQuality: 22
- nstart > 1 recommended (e.g.
nstart = 25): runs algorithm from multiple random starts
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Data
PromptBeginner5 minmarkdownQuality: 26
- For composite hypotheses (parameters estimated from data)
p-values are conservative (too large). Use dgof or ks.test with exact = NULL for discrete distributions.
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