> For the complete documentation index, see [llms.txt](https://docs.geodin.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.geodin.com/data-analysis/data-analysis-overview.md).

# Overview

Querying, filtering, formulas, and the calculation engine - finding and deriving value from the data you collected.

## Queries

Filter and retrieve objects, measurement points, and layer descriptions by condition.

* [Creating Queries](/data-analysis/creating-queries.md) - filter objects and measurement points by conditions.
* [Parameterized Queries](/data-analysis/creating-queries/parameterized-queries.md) - queries with placeholders that prompt for values at execution time.
* [SQL and Advanced Options](/data-analysis/creating-queries/sql-and-advanced-options.md) - direct SQL entry for logic the visual builder cannot express.
* [Query Builder Reference](/data-analysis/query-builder-reference.md) - reference for the Query Builder, including the subquery table list and schema handling.
* [Conditions and Operators](/data-analysis/query-builder-reference/conditions-and-operators.md) - comparison and logical operators used to filter a result set.
* [Layer Queries](/data-analysis/layer-queries.md) - query coded layer descriptions such as soil and rock attributes.
* [Complex Layer Queries](/data-analysis/layer-queries/complex-layer-queries.md) - advanced layer-query cases building on Layer Queries.

## Formulas

Compute and store derived values from data already in the dataset.

* [Formula Basics](/data-analysis/formula-basics.md) - compute derived values with GeoDin's formula syntax.
* [Formulas in Measurement Values](/data-analysis/formulas-in-measurement-values.md) - apply formulas to measurement-value series.
* [Object Type Formulas](/data-analysis/object-type-formulas.md) - define formulas on a data type's fields.

## Calculation engine

Automated checks, geotechnical analyses, and curve-fitting applied to your data.

* [Data Checks and Validations](/data-analysis/data-checks-and-validations.md) - automated checks and rules applied at data entry.
* [Geotechnical Analyses](/data-analysis/geotechnical-analyses.md) - hydrogeochemical and grain-size analysis methods and their diagrams.
* [Regression and Curve Fitting](/data-analysis/regression-and-curve-fitting.md) - time-series and measurement-value series properties for regression and curve-fitting work.


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# Agent Instructions
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## Querying This Documentation
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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.