Awesome-Agent-Skills-for-Empirical-Research education-data-source-nccs

install

source · Clone the upstream repo

git clone https://github.com/brycewang-stanford/Awesome-Agent-Skills-for-Empirical-Research

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/brycewang-stanford/Awesome-Agent-Skills-for-Empirical-Research "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/17-DAAF-Contribution-Community-daaf/dot-claude/skills/education-data-source-nccs" ~/.claude/skills/brycewang-stanford-awesome-agent-skills-for-empirical-research-education-data-so-e0b1a4 && rm -rf "$T"

manifest: skills/17-DAAF-Contribution-Community-daaf/dot-claude/skills/education-data-source-nccs/SKILL.md

source content

NCCS Data Source Reference

National Center for Charitable Statistics (NCCS) Form 990 data for private nonprofit colleges and universities (Portal mirror: IPEDS-matched institutions, 1993-2016). Use when IRS-based financial data — revenue, expenses, assets, endowment details — or governance information (board composition, executive compensation) is needed beyond what IPEDS provides. Portal data ends at 2016; for current filings use full NCCS directly. Public institutions do not file Form 990 and are excluded.

The NCCS (National Center for Charitable Statistics) is the principal U.S. repository for empirical data on the nonprofit sector, derived from IRS Form 990 filings. It provides financial depth, governance detail, and historical coverage for private nonprofit colleges and universities that goes well beyond what IPEDS collects.

CRITICAL: Value Encoding

The Education Data Portal encodes ALL categorical variables as integers, not strings. Variable names are lowercase in Portal data. Always verify codes against codebooks.
Context
fips
mult_ein_flag
Portal integer
6
(California)
1
(Yes)
Original NCCS
"06"
or string
N/A
See
./references/variable-definitions.md
for complete encoding tables.

What is NCCS?

Operator: Urban Institute, Center on Nonprofits and Philanthropy
Coverage: All U.S. tax-exempt nonprofit organizations (~3.8M in BMF)
Primary data source: IRS Form 990 tax filings
Frequency: Annual (with filing lag)
Available years: 1989-present (Core Series); 2012-present (Efile); 1993-2016 (Portal)
Primary identifier: EIN (Employer Identification Number, 9-digit)
Education relevance: Private nonprofit colleges/universities are 501(c)(3) orgs filing Form 990; NTEE codes B40-B50 cover higher education

Reference File Structure

File	Purpose	When to Read
`nonprofit-data.md`	NCCS datasets and what they contain	Understanding available data sources
`form-990.md`	IRS Form 990 structure and data elements	Understanding what information is collected
`education-relevance.md`	How NCCS relates to higher education	Connecting nonprofit data to education research
`ntee-codes.md`	Nonprofit classification system	Finding and filtering educational institutions
`variable-definitions.md`	Key financial and organizational variables, codes, special values	Interpreting specific data elements or building queries

Decision Trees

What data am I looking for?

Research need?
├─ Financial data for private colleges → ./references/form-990.md
│   ├─ Revenue breakdown → Part VIII (Statement of Revenue)
│   ├─ Expenses by function → Part IX (Statement of Functional Expenses)
│   ├─ Assets and liabilities → Part X (Balance Sheet)
│   └─ Endowment details → Schedule D
├─ Governance/leadership → ./references/form-990.md
│   ├─ Board members → Part VII (Compensation)
│   ├─ Executive compensation → Part VII, Schedule J
│   └─ Policies and procedures → Part VI (Governance)
├─ Organizational characteristics → ./references/nonprofit-data.md
│   ├─ Basic info (name, address, EIN) → BMF
│   ├─ Tax-exempt type → BMF (SUBSECCD)
│   └─ NTEE classification → BMF (NTEECC)
└─ Identify institutions → ./references/ntee-codes.md
    ├─ All higher education → NTEE B40-B50
    ├─ Universities → B40, B41, B42, B43
    └─ Community colleges → B44

Which NCCS dataset should I use?

Dataset selection?
├─ Need universe of all nonprofits?
│   └─ Business Master File (BMF) → ./references/nonprofit-data.md
├─ Need detailed financial variables?
│   ├─ Large organizations (full 990 filers) → Core PC files
│   ├─ All organizations (990 + 990EZ) → Core PZ files
│   └─ Maximum detail (2000+ fields) → Efile database
├─ Need private foundations?
│   └─ Core PF or 990-PF Efile data
└─ Need small grassroots orgs?
    └─ 990-N ePostcard database

How do I connect NCCS to other education data?

Linking NCCS to education data?
├─ Need to match to IPEDS?
│   └─ See ./references/education-relevance.md (EIN-UNITID crosswalk)
├─ Need geographic analysis?
│   └─ Use BMF geocoded addresses + Census crosswalks
├─ Want institutional comparisons?
│   └─ Filter by NTEE codes B40-B50 for higher ed
└─ Analyzing trends over time?
    └─ Use Core data panel (1989-present)

Quick Reference: NCCS Datasets and Variables

Available Datasets

Portal mirror (via

fetch_from_mirrors()

Dataset	Description	Coverage	Rows
990 Forms ( `nccs/colleges_nccs_all` )	Form 990 data for higher ed institutions matched to IPEDS	1993-2016, ~2,600 institutions	~30K

Full NCCS (direct download, outside Portal):

Dataset	Description	Coverage	Key Use
Business Master File (BMF)	All active tax-exempt organizations	~3.8M orgs	Sampling frame, basic info
NCCS Core Series	990/990EZ filer financials	1989-2022	Historical financial analysis
IRS 990 Efile	Full electronic filings (2000+ fields)	2012-present	Detailed governance, programs
Form 990-N ePostcard	Small nonprofits (<$50K revenue)	2007-present	Grassroots organizations
Pub78	Organizations eligible for tax-deductible donations	Current	Verify charitable status

Scope note: The Portal mirror dataset contains NCCS Form 990 data matched to IPEDS institutions only (~2,600 institutions). It does NOT include the full NCCS universe of ~3.8M nonprofits. For non-education nonprofits, NTEE-based filtering, or BMF/Core/Efile data, download directly from NCCS.

Key Identifiers

Portal dataset:

ID	Format	Level	Example	Notes
`unitid`	Integer	Institution	`110635`	IPEDS institution ID (Portal addition)
`ein`	Integer	Organization	`10211484`	Employer Identification Number
`fips`	Integer	State	`6` (California)	State FIPS code

Full NCCS (direct download, outside Portal):

ID	Format	Level	Example	Notes
`EIN`	9-digit number	Organization	`123456789`	Unique to each nonprofit
`NTEECC`	Letter + 2 digits	Classification	`B42` (4-year college)	May be imprecise (~25%); NOT in Portal data
`SUBSECCD`	2-digit code	Tax subsection	`03` (501(c)(3) charity)	NOT in Portal data
`FIPS`	5-digit code	Geography	`06037` (LA County)	State + county; Portal uses state-level integer

Education NTEE Codes

Code	Description
B20-B29	Elementary & Secondary Schools
B40	Higher Education Institutions (General)
B41	Two-Year Colleges
B42	Undergraduate Colleges (4-year)
B43	Universities
B50	Graduate/Professional Schools
B60	Adult/Continuing Education
B70	Libraries
B80	Student Services/Organizations
B90	Educational Services/Schools N.E.C.

Portal Variable Name Mapping (Selected)

The Portal dataset has 161 columns. Key mappings from original NCCS/990 names to Portal lowercase names:

Portal Name	Original NCCS/990	Description
`year`	`FISYR`	Academic year (fall semester) — Portal-aligned year (1993-2016)
`fiscal_year`	—	IRS fiscal year ending year from 990 filing (1994-2017); typically `year` + 1
`unitid`	—	IPEDS institution ID (Portal addition)
`ein`	`EIN`	Employer Identification Number
`fips`	`FIPS`	State FIPS code (integer)
`inst_name_nccs`	`NAME`	Organization name from 990 filing
`mult_ein_flag`	—	Multiple-EIN indicator (0=No, 1=Yes)
`contributions_total`	`CONT`	Total contributions
`prog_serv_rev`	`PROGREV`	Program service revenue
`revenue_total`	`TOTREV`	Total revenue
`expenses_total`	`EXPS`	Total expenses
`total_assets_eoy`	`TOTASS`	Total assets (end of year)
`net_assets_eoy`	`NETASS`	Net assets (end of year)
`compensation_officers`	`COMPENS`	Officer compensation
`salaries_other`	`OTHSAL`	Other salaries

Note: The full 161 columns include detailed revenue breakdowns (Part VIII), expense breakdowns (Part IX), and balance sheet items (Part X). Consult the codebook for the complete list. Use
get_codebook_url("nccs/codebook_colleges_nccs_form_990")
from
fetch-patterns.md
to download it.

Missing Data Codes

Code	Meaning	When Used
`-1`	Data unavailable	Not collected for this form/year
`-2`	Not applicable	Field doesn't apply to this entity
`-3`	Suppressed	Confidentiality restriction
`null`	Not reported	Organization did not report (may have data)
`0`	Zero value	Explicitly reported as zero

Important: In Portal data,
-1
/
-2
/
-3
are integer values. However, empirically these codes are rare in the NCCS Portal dataset — most missing data appears as
null
rather than negative codes. Only a handful of financial columns (e.g.,
sale_sec_gross_net
,
changes_net_assets_other
) contain any
-1
/
-2
/
-3
values. A
0
means the organization reported zero;
null
means the organization did not report. These are distinct conditions.

Data Access

Datasets for NCCS are available via the mirror system. See

datasets-reference.md

for canonical paths,

mirrors.yaml

for mirror configuration, and

fetch-patterns.md

for fetch code patterns.

Dataset	Type	Years	Path	Codebook
990 Forms	Single	1993-2016	`nccs/colleges_nccs_all`	`nccs/codebook_colleges_nccs_form_990`

Codebooks are

.xls

files co-located with data in all mirrors. Use

get_codebook_url()

from

fetch-patterns.md

to construct download URLs.

Truth Hierarchy: When interpreting variable values, apply this priority:

Actual data file (what you observe in the parquet/CSV) — this IS the truth

Live codebook (.xls in mirror) — authoritative documentation, may lag

This skill documentation — convenient summary, may drift from codebook

If this documentation contradicts the codebook, trust the codebook. If the codebook contradicts observed data, trust the data and investigate.

Filtering

The Portal dataset is pre-filtered to higher education institutions matched to IPEDS UNITIDs. NTEE codes are NOT included in the Portal data — for NTEE-based filtering, use the full NCCS BMF directly.

import polars as pl

# Filter by year
df_2015 = df.filter(pl.col("year") == 2015)

# Filter by state (integer FIPS codes)
df_ca = df.filter(pl.col("fips") == 6)  # California

# Filter out null values from financial columns
df_valid = df.filter(
    (pl.col("revenue_total").is_not_null()) &
    (pl.col("revenue_total") >= 0)  # Excludes rare -1/-2/-3 codes
)

# Replace negative codes with null for analysis (precautionary)
df = df.with_columns(
    pl.when(pl.col("revenue_total") < 0)
    .then(None)
    .otherwise(pl.col("revenue_total"))
    .alias("revenue_total_clean")
)

Common Pitfalls

Pitfall	Issue	Solution
Using string codes	Portal uses integer FIPS ( `6` ), not string ( `"CA"` or `"06"` )	Always use integer comparisons; filter `>= 1` to exclude missing codes
Filing threshold confusion	Organizations under $200K revenue may file 990-EZ with fewer variables	Check form type; use Core PZ files for combined 990/990-EZ coverage
Fiscal year variation	Nonprofits have different fiscal year ends (June 30 common for colleges)	`year` = Portal academic year (fall semester); `fiscal_year` = IRS fiscal year end (typically `year` + 1). Filter on `year` for IPEDS joins.
No NTEE in Portal data	Portal dataset does not include NTEE codes; pre-filtered to higher ed institutions	Cannot filter by NTEE code; use full NCCS BMF for NTEE-based filtering
NTEE classification accuracy	~25% of NTEE codes estimated to be imprecise	Use NCCS-corrected codes ( `NTEE_NCCS` ) over IRS-assigned codes when available
Consolidated filings	Some university systems file consolidated 990s covering multiple campuses	Check `mult_ein_flag` ; one EIN may represent multiple institutions
Form version changes	Form 990 was redesigned in 2008; variable definitions changed	Be cautious comparing pre-2008 and post-2008 data for governance variables
Missing vs. zero	`0` means explicitly reported zero; `null` means not reported	Distinguish between zero-value and not-reported before aggregating

Key Differences: NCCS vs. IPEDS

Aspect	NCCS (Form 990)	IPEDS
Coverage	All 501(c)(3) nonprofits	Title IV institutions only
Reporting Basis	IRS fiscal year	IPEDS survey cycles
Financial Framework	Nonprofit accounting (GAAP)	Education-specific categories
Governance	Detailed board/compensation data	Limited HR data
Programs	Mission statements, activities	Degree programs, enrollment
Identifier	EIN	UNITID
Update Frequency	Annual (with lag)	Annual

Exploration Workflow

Using Portal Data (Recommended for Education Research)

Fetch data via
```
fetch_from_mirrors("nccs/colleges_nccs_all")
```
- Data is pre-filtered to higher education institutions matched to IPEDS
- Already includes
```
unitid
```
  for IPEDS joining
- 161 financial/organizational variables, 1993-2016
Filter and clean
- Filter by year, state (FIPS), or institution
- Handle nulls (primary missing data form in Portal)
- Check for rare negative codes (-1/-2/-3) in financial columns
Link to IPEDS using
```
unitid
```
and
```
year
```
columns
- Join with IPEDS directory, enrollment, finance, etc.
Analyze — See variable definitions for meaning and limitations

Using Full NCCS (for Non-Education or Pre-Portal Research)

Identify target organizations
- Filter BMF by NTEE codes (B40-B50 for higher ed)
- Verify 501(c)(3) status (SUBSECCD = 03)
- Note EINs for organizations of interest
Select appropriate dataset
- Core PZ for broad coverage
- Core PC for detailed financials (larger orgs)
- Efile for maximum detail (governance, compensation)
Extract and clean data
- Download relevant years from NCCS directly
- Merge with BMF for organizational attributes
- Handle missing data codes
Analyze — See variable definitions for meaning and limitations

Related Data Sources

Source	Relationship	When to Use
`education-data-source-ipeds`	Complementary institution data	Join on EIN-UNITID crosswalk for enrollment, degrees, and education-specific financials
`education-data-explorer`	Parent discovery skill	Finding available endpoints
`education-data-query`	Data fetching	Downloading parquet/CSV files

Topic Index

Topic	Reference File
BMF overview	`./references/nonprofit-data.md`
Core data series	`./references/nonprofit-data.md`
Efile database	`./references/nonprofit-data.md`
Form 990 structure	`./references/form-990.md`
Revenue variables	`./references/form-990.md`
Expense variables	`./references/form-990.md`
Balance sheet	`./references/form-990.md`
Governance data	`./references/form-990.md`
Schedule details	`./references/form-990.md`
Linking to IPEDS	`./references/education-relevance.md`
Private college identification	`./references/education-relevance.md`
Supplementing education research	`./references/education-relevance.md`
NTEE code structure	`./references/ntee-codes.md`
Education NTEE codes	`./references/ntee-codes.md`
NTEEV2 format	`./references/ntee-codes.md`
Financial variables	`./references/variable-definitions.md`
Variable naming conventions	`./references/variable-definitions.md`
Data quality issues	`./references/variable-definitions.md`

Context	`fips`	`mult_ein_flag`
Portal integer	`6` (California)	`1` (Yes)
Original NCCS	`"06"` or string	N/A