IGF {lme4} | R Documentation

## Radioimmunoassay of IGF-I Protein

### Description

The `IGF` data frame has 237 rows and 3 columns.

### Format

This data frame contains the following columns:

Lot
  an ordered factor giving the radioactive tracer lot.
age
  a numeric vector giving the age (in days) of the radioactive tracer.
conc
  a numeric vector giving the estimated concentration of IGF-I protein (ng/ml)

### Details

Davidian and Giltinan (1995) describe data obtained during quality control radioimmunoassays for ten different lots of radioactive tracer used to calibrate the Insulin-like Growth Factor (IGF-I) protein concentration measurements.

### Source

Davidian, M. and Giltinan, D. M. (1995), Nonlinear Models for Repeated Measurement Data, Chapman and Hall, London.

Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York. (Appendix A.11)

### Examples

    data(IGF)

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