diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
new file mode 100644
index 0000000..c2a0760
--- /dev/null
+++ b/.github/workflows/reviewdog.yml
@@ -0,0 +1,347 @@
+name: reviewdog
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  reviewdog-github-check:
+    permissions:
+      checks: write
+      contents: read
+      pull-requests: write
+    name: reviewdog (github-check)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - name: Install linters
+        run: go install golang.org/x/lint/golint@latest
+
+      - name: Setup reviewdog
+        # uses: reviewdog/action-setup@v1
+        run: |
+          go install ./cmd/reviewdog
+
+      - name: Run reviewdog
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          golint ./... | reviewdog -f=golint -name=golint-github-check -reporter=github-check -level=warning
+
+      - name: Run reviewdog with sub-dir (github-check)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cd ./_testdata/ && golint ./... | reviewdog -f=golint -name=golint-check-subdir -reporter=github-check -level=info -filter-mode=nofilter
+
+      - name: Custom rdjson test (github-check)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cat ./_testdata/custom_rdjson.json | \
+            reviewdog -name="custom-rdjson" -f=rdjson -reporter=github-check -level=info
+
+      - name: reviewdog project run
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+            reviewdog -reporter=github-check
+
+  reviewdog-pr:
+    permissions:
+      checks: write
+      contents: read
+      pull-requests: write
+    if: github.event_name == 'pull_request'
+    name: reviewdog on Pull Request
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - name: Install linters
+        run: go install golang.org/x/lint/golint@latest
+
+      - name: Setup reviewdog
+        # uses: reviewdog/action-setup@v1
+        run: |
+          go install ./cmd/reviewdog
+
+      - name: Run reviewdog (github-pr-check)
+        continue-on-error: true
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          reviewdog -reporter=github-pr-check -runners=golint,govet -fail-on-error
+
+      - name: Run reviewdog (github-pr-review with tee)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          # Remove Go Problem Matchers [1] as it reports duplicate results with
+          # reviewdog.
+          # [1]: https://github.com/actions/toolkit/blob/master/docs/commands.md#problem-matchers
+          echo "::remove-matcher owner=go::"
+          golint ./... | reviewdog -f=golint -name=golint-pr-review -reporter=github-pr-review -tee
+
+      - name: Run reviewdog with sub-dir (github-pr-review)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cd ./_testdata/ && golint ./... | reviewdog -f=golint -name=golint-pr-review-subdir -reporter=github-pr-review -tee
+
+      - name: Run reviewdog with sub-dir (local+fail-on-error)
+        run: |
+          echo 'var LocalTest = 14' >> ./_testdata/golint.go
+          cd ./_testdata/ && golint ./... | reviewdog -f=golint -diff="git diff" -fail-on-error || EXIT_CODE=$?
+          git reset --hard @
+          test "${EXIT_CODE}" = 1
+
+      - name: Run reviewdog (github-pr-check with fail-on-error)
+        continue-on-error: true
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cd ./_testdata/ && golint ./... | reviewdog -f=golint -name=golint-pr-check-fail-on-error -reporter=github-pr-check -fail-on-error
+
+      - name: Run reviewdog (github-pr-check with -filter-mode=file)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          golint | reviewdog -f=golint -name=golint-pr-check-filter-mode-file -reporter=github-pr-check -filter-mode=file -level=warning
+
+      - name: Run reviewdog (github-pr-review -filter-mode=nofilter)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cd ./_testdata/ && golint ./... | reviewdog -f=golint -name=golint-pr-review-nofilter -reporter=github-pr-review -filter-mode=nofilter -fail-on-error || EXIT_CODE=$?
+          test "${EXIT_CODE}" = 1
+
+      - name: Unexpected failure (github-pr-review)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cd ./_testdata/ && reviewdog -conf=reviewdog_error.yml \
+            -reporter=github-pr-review || EXIT_CODE=$?
+          test "${EXIT_CODE}" = 1
+      - name: Unexpected failure (github-check)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cd ./_testdata/ && reviewdog -conf=reviewdog_error.yml \
+            -reporter=github-check || EXIT_CODE=$?
+          test "${EXIT_CODE}" = 1
+      - name: Unexpected failure (local)
+        run: |
+          cd ./_testdata/ && reviewdog -conf=reviewdog_error.yml \
+            -reporter=local -diff='git diff master' || EXIT_CODE=$?
+          test "${EXIT_CODE}" = 1
+      - name: Suggestion (rdjsonl)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cat ./_testdata/suggestions.json | \
+            reviewdog -name="suggestion-test" -f=rdjsonl -reporter=github-pr-review
+
+      - name: Custom rdjsonl test (github-pr-review)
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cat ./_testdata/custom_rdjson.json | \
+            reviewdog -name="custom-rdjson" -f=rdjson -reporter=github-pr-review -filter-mode=file
+
+      - name: gofmt -s with reviewdog
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gofmt -s -d . | \
+            reviewdog -name="gofmt" -f=diff -f.diff.strip=0 -reporter=github-pr-review
+
+      - name: reviewdog project run
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+            reviewdog -reporter=github-pr-review
+
+  golangci-lint:
+    permissions:
+      checks: write
+      contents: read
+      pull-requests: write
+    if: github.event_name == 'pull_request'
+    name: runner / golangci-lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-golangci-lint@v2
+        with:
+          github_token: ${{ secrets.github_token }}
+          golangci_lint_flags: "--timeout 2m"
+          level: "warning"
+          reporter: github-pr-check
+
+  staticcheck:
+    permissions:
+      checks: write
+      contents: read
+      pull-requests: write
+    if: github.event_name == 'pull_request'
+    name: runner / staticcheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+      - uses: reviewdog/action-staticcheck@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-review
+          filter_mode: nofilter
+          fail_on_error: true
+          # workdir: ./_testdata/
+
+  misspell:
+    name: runner / misspell
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-misspell@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          locale: "US"
+          reporter: github-check
+
+  reviewdog-github-annotations:
+    permissions:
+      contents: read
+    name: reviewdog (github-pr-annotations)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - name: Setup reviewdog
+        # uses: reviewdog/action-setup@v1
+        run: |
+          go install ./cmd/reviewdog
+
+      - name: Custom rdjson test
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          cat ./_testdata/custom_rdjson.json | \
+            reviewdog -name="custom-rdjson" -f=rdjson -reporter=github-pr-annotations
+
+  reviewdog-sarif:
+    permissions:
+      contents: read
+      actions: read
+      security-events: write
+    name: reviewdog (sarif)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+      - name: Setup reviewdog
+        # uses: reviewdog/action-setup@v1
+        run: |
+          go install ./cmd/reviewdog
+      - name: Custom rdjson test
+        run: |
+          mkdir ../results
+          cat ./_testdata/custom_rdjson.json |
+            reviewdog -name="custom-rdjson" -f=rdjson -reporter=sarif |
+            tee ../results/custom-rdjson.sarif
+      - name: Install linters
+        run: go install golang.org/x/lint/golint@latest
+      - name: Run golint
+        run: |
+          golint ./... | reviewdog -f=golint -reporter=sarif |
+            tee ../results/golint.sarif
+      - uses: github/codeql-action/upload-sarif@v3
+
+  typos:
+    name: runner / typos
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-typos@v1
+
+  languagetool:
+    name: runner / languagetool
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-languagetool@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-check
+          level: info
+          patterns: |
+            **/*.md
+            !**/testdata/**
+
+  shellcheck:
+    if: github.event_name == 'pull_request'
+    name: runner / shellcheck
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-shellcheck@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-pr-review
+
+  alex:
+    name: runner / alex
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-alex@v1
+        with:
+          github_token: ${{ secrets.github_token }}
+          reporter: github-check
+          level: info
+
+  textlint:
+    name: runner / textlint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-setup@v1
+      - run: npm install
+      - name: textlint
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          npx textlint -f checkstyle README.md | \
+            reviewdog -f=checkstyle -name="textlint" -reporter=github-check -level=info
+
+  sarif:
+    name: runner / textlint sarif
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: reviewdog/action-setup@v1
+      - run: npm install
+      - name: textlint sarif
+        env:
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          npx textlint -f @microsoft/eslint-formatter-sarif README.md | \
+            reviewdog -f=sarif -name="textlint" -reporter=github-check -level=info
diff --git a/data_analysis_tools.py b/data_analysis_tools.py
new file mode 100644
index 0000000..975ec63
--- /dev/null
+++ b/data_analysis_tools.py
@@ -0,0 +1,26 @@
+from typing import List, Union
+
+
+def _info_check_meta(df, cols: Union[List, str], _fn, *args, **kwargs):
+    if isinstance(cols, list):
+        for col in cols:
+            _fn(df, col, *args, **kwargs)
+    elif isinstance(cols, str):
+        _fn(df, cols, *args, **kwargs)
+    else:
+        raise ValueError(f'Unsupported cols type {type(cols)}')
+        
+
+def nan_info(df, cols: Union[List, str]):
+    """Check nan ratio in pandas DataFrame"""
+    def _fn(df, col):
+        print(f'- nan ratio in {col}:', df[col].isna().mean())
+    _info_check_meta(df, cols, _fn)
+
+
+def substr_info(df, cols: Union[List, str], substr:str):
+    """Check specific str ratio in pandas DataFrame"""
+    def _fn(df, col, substr):
+        print(f'- {substr} ratio in {col}:', (df[col] == substr).mean())
+    _info_check_meta(df, cols, _fn, substr=substr)
+