arrow_ipc.qwer · 1.0.0Apache Arrow IPC stream and file formats read and written, through the official Rust crates: schemas, record batches split by size, rows to columns and back with nulls, lists, structs, dictionaries, decimals, dates and timestamps, LZ4 compression, and a schema inferred from rows. Values that do not fit their type name the row, and damaged data is an error.4 views · 8 downloadsAvro avro.qwer · 1.0.0Apache Avro data files: rows written with a schema, as Kafka, Hadoop and BigQuery use, and read back with the schema they carry.9 views · 6 downloadsParquet parquet.qwer · 1.0.0Parquet files for data lakes, DuckDB, Spark and pandas: rows written with their column types found, and read back as rows.6 views · 9 downloadsIP anonymizing ip_anonymize.qwer · 1.0.0IP addresses made GDPR-friendly: the last part cut off (/24, /48) for logs, or a salted hash that counts visitors without keeping them.7 views · 8 downloadsUser agents useragent.qwer · 1.0.0A User-Agent header read: browser, version, system, device kind, and whether it is a crawler.8 views · 9 downloadsPercentiles quantiles.qwer · 1.0.0Streaming percentiles kept in memory by name: p50, p95 and p99 of response times or order values with a t-digest that stays small, and the rank of any value.7 views · 8 downloadsRoaring sets roaring.qwer · 1.0.0Compressed sets of ids as Roaring bitmaps: who liked, who is in a segment, which products match; added to, combined by union, intersection and difference, counted, and kept as base64 text.6 views · 8 downloadsSketches sketches.qwer · 1.0.0Counting at scale in little memory, kept by name for all requests: unique visitors by HyperLogLog, merged across days, and top pages or search terms by a count-min sketch.7 views · 7 downloadsHeatmaps heatmap.qwer · 1.0.0Heatmaps as PNG: clicks or sightings blurred into a density map over a screenshot or a plain background, and tables of numbers as coloured grids.9 views · 9 downloadsBigQuery bigquery.qwer · 1.0.0BigQuery over REST: jobs.query with parameters, polled until done and read to the last page, rows typed by their schema with numerics exact and nested records as maps, dry runs, streaming inserts with each row's errors read, and service-account JWT sign-in.2 views · 7 downloadsClickHouse clickhouse.qwer · 1.0.0ClickHouse over HTTP: queries with typed parameters, JSONEachRow inserts with async mode and deduplication tokens, results typed by their columns with big integers back as numbers and decimals kept exact, and errors read from the body, even those that come after a 200.4 views · 7 downloadsDuckDB duckdb.qwer · 1.0.0SQL over CSV and Parquet files inside the server: totals, groups and joins over exports, no database to load first.8 views · 6 downloadsGoogle Analytics 4 ga4.qwer · 1.0.0Google Analytics 4 from the server: the Measurement Protocol with its limits and reserved names checked first, since the live endpoint accepts anything and answers 204, its validation endpoint read back, and Data API reports by service-account JWT, returned as rows of maps with typed numbers, paged by offset, with the property's quota.3 views · 5 downloadsMixpanel mixpanel.qwer · 1.0.0Mixpanel from the server: events tracked and history imported by a service account, batches cut to 2000, stable $insert_ids so a retry is not counted twice, failed records read back by position, people and group profiles in Mixpanel's own operations, and the Query API for segmentation, funnels, retention, saved reports and profiles, without JQL.4 views · 9 downloadsPostHog posthog.qwer · 1.0.0PostHog from the server: events and batches cut to fit, identify, alias and group identify in PostHog's own event forms, feature flags evaluated by /decide with their payloads parsed, partial failures and quota limits told apart, and a fallback so a page does not break with PostHog.3 views · 7 downloadsSegment segment.qwer · 1.0.0Segment's HTTP Tracking API without a library: track, identify, group, page, screen and alias with message ids that keep a retry from counting twice, the 32 KB and 500 KB limits met before Segment refuses, batches cut to fit, and a webhook's payload mapped by a table into messages, as a source function would.3 views · 6 downloadsA/B tests ab_tests.qwer · 1.0.0A/B tests from start to end: variants that stay each user's, the visitors needed, and whether a difference is real by z-test, Welch's t-test, chance to win and a sample ratio check.7 views · 8 downloadsLog parser log_parse.qwer · 1.0.0Log lines into rows: nginx and Apache access logs, syslog, logfmt and JSON lines, the format found by itself, with counts by any field.7 views · 7 downloadsAnomaly detection anomalies.qwer · 1.0.0Outliers and odd moments found in numbers: z-scores, the robust MAD score, IQR fences and Grubbs' test; and in series over time, spikes against a rolling window or the same hour of past days, EWMA control limits and level shifts by CUSUM.8 views · 8 downloadsClustering clustering.qwer · 1.0.0Data put into groups: k-means with k chosen by the elbow and silhouette, DBSCAN for groups of any shape and their outliers (in metres for latitude and longitude), and hierarchical clustering, on rows of numbers or maps.7 views · 7 downloadsForecasting forecast.qwer · 1.0.0Forecasts from a series of numbers: moving averages, exponential smoothing, Holt's trend and Holt-Winters seasons with their weights fitted, the best model chosen on held-out data, prediction intervals, and accuracy measures.8 views · 9 downloadsStatistical tests statistics.qwer · 1.0.0Statistical tests and regression beyond Quillo's stats: t-tests (one-sample, paired, Welch), ANOVA, chi-square tests, Mann-Whitney U, correlation with its p-value, confidence intervals, and multiple linear regression with standard errors and p-values.7 views · 7 downloadsOther tags
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