Data Analysis Tools

Statistics, regression, CSV cleanup, charts. · 20 tools

AB Test Significance CalculatorTests whether a difference in conversion rates between two variants is statistically significant, using a two-proportion z-test.Confidence Interval CalculatorBuilds a confidence interval for a sample mean using the normal (z) approximation, at 90%, 95% or 99% confidence.Correlation CalculatorComputes the Pearson correlation coefficient between two paired datasets, with a scatter plot and strength interpretation.CSV Chart MakerUpload or paste CSV data, pick a label and value column, and instantly render a bar, line or donut chart.CSV Column ExtractorPull out just the columns you need from a CSV file, in their original order, and download the trimmed-down result.CSV DeduplicatorRemove duplicate rows from CSV data, either by full-row match or by a chosen key column (e.g. email, ID).CSV Filter and SortFilter CSV rows by a column condition, then sort by any column ascending or descending, with a CSV download.CSV MergerCombine multiple CSV files into one, either stacking matching rows or joining them side by side on a shared key column.CSV Pivot TableGroup CSV rows by a chosen column and aggregate another column, sum, average, count, min or max, like a simple pivot table.CSV SplitterSplit a large CSV file into several smaller files by row count, each keeping the header row, downloaded as a ZIP.Data NormalizerRescales a dataset using min-max scaling (to 0-1) or z-score standardization, with both views shown side by side.Histogram MakerBins a numeric dataset into a frequency distribution and renders it as a bar chart, with an adjustable bin count.Linear Regression CalculatorFits a least-squares regression line to paired data, with the equation, R², a scatter plot, and a prediction tool.Mean Median Mode CalculatorThe three measures of central tendency for a dataset, with guidance on which best represents your data when they diverge.Outlier DetectorFlags unusual values in a dataset using either the IQR (box-plot) method or a z-score threshold.Percentile CalculatorFind the value at any percentile in a dataset, or the percentile rank of a specific value, using linear interpolation.Sample Size CalculatorDetermines how many respondents a survey needs for a target confidence level, margin of error, and population size.Standard Deviation CalculatorComputes sample and population variance/standard deviation for a dataset, with a step-by-step deviation breakdown.Statistics CalculatorA full descriptive-statistics summary, mean, median, mode, range, variance, standard deviation and quartiles, for any dataset.Z-Score CalculatorStandardises a dataset to z-scores, how many standard deviations each value is from the mean, with a single-value lookup.

Paste a column of numbers or upload a CSV to get descriptive statistics, regression lines, correlations, percentiles, confidence intervals and significance tests. CSV utilities filter, sort, merge, split and deduplicate data.

All calculations run locally, which makes the tools suitable for confidential business data.

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