70 point Acetic acid curve by GC/FID

These data are from a calibration of Acetic acid on a GC/FID instrument with a headspace autosampler with 70 calibrated points (10 points were targeted for each level, but replicates were weighed individually resulting in 70 unique amount points measured in mg). One major outlier was added after the fact to illustrate how outliers can pull the calibration model. These data illustrate problems with analytical data from chromatography experiments that largely go unnoticed because there's not enough data collected to see them, namely non-normal error, heteroscedasticity, and outliers.本数据集源自采用顶空自动进样器（Headspace Autosampler）的气相色谱-氢火焰离子化检测器（Gas Chromatography-Flame Ionization Detector，简称GC/FID）对乙酸（Acetic acid）进行的校准实验。本次校准共设置70个校准点：原计划每个浓度水平配置10个点，但由于重复样本均单独称重，最终得到70个以毫克为单位的不同进样量实测点。后续人为添加了1个显著异常值，用以演示异常值如何偏移校准模型。本数据集直观展现了色谱分析实验中常被忽视的分析数据问题——由于采集的数据量不足而难以被察觉的非正态误差、异方差性以及异常值。