Objective | Plot trajectories | Fit broken stick model with one line | Fit broken stick model with two lines | Extend to nine lines | Obtain predicted values | Explained variance | Subject level analysis | Conclusion

D-score and DAZ | Preliminaries | Install the dscore package | GSED 9-position item names | Response data format | GSED Instruments | Instruments | GSED SF | Check | Renaming example | Calculate D-score | GSED LF | GSED HF | Other GSED instruments | References for DAZ calculation | preliminary_standards references | descriptive references | Literature references

Background | Default Prior Mean and Standard Deviation | Setting Your Own Prior Mean and Standard Deviation | Example 1: Custom Prior Mean | Example 2: Setting a Custom Prior Standard Deviation | Handling Missing Ages | Example 3: Customizing Prior Mean and Standard Deviation for Missing Ages

Overview | Is your measurement instrument covered? | GSED 9-position item names | Calculate the D-score and DAZ | Summarise D-score and DAZ | References

Motivation | Relation to the D-score | Default vs. Alternative Keys | Policy for default key selection | When to use an older key | Working with Keys in Practice | List available keys | Set the key | Change the default (session or project) | Comparing Keys | Impact on D-scores | Diagnostics | Stability over time | Caveats and Limitations | Recommendations for Users | Worked Examples | Example 1: Score with the default key | Example 2: Score with a specific older key and compare | Example 3: Visualize differences | Reproducibility Notes

What is DAZ? | How is DAZ calculated? | Who is in the reference population used in the D-score package? | Can I use a benchmark with DAZ to monitor the proportion of children that are developmentally on track? | Examples of DAZ and interpretation | NA values for DAZ

What is the broken stick model? | What are the main model assumptions? | Why should I want to use the broken stick model? | What is in the package? | Acknowledgment

Objective | Data generation | Fit model | Conclusions

Background | Main changes | Minor changes | Install legacy version | Examples | Example 1: Fit model | Example 2: Predict model | Example 3: Plot model