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Today, I will talk to you about Minitab: Inter-group / intra-group ability analysis, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

Inter-group / intra-group ability analysis

The inter-group / intra-group capability analysis can generate process capability reports based on inter-group and intra-group variations at the same time.

[example 1] an engineer collected 3 coating thickness measurements from 25 continuously processed paper rolls. For each new roll, the machine is reset, so engineers need to consider not only the variation within the roll, but also the variation between the rolls. The thickness of the film must be 50 ±3 μ m to meet the engineering specifications. Try to conduct inter-group / intra-group ability analysis. (film thickness. MTW).

First, open the worksheet: "Film thickness .MTW".

2. Select [Statistics (Stat)]

→ [quality tool (QualityTools)]

→ [competency Analysis (CapabilityAnalysis)]

→ [inter-group / intra-group (Between/Within)] menu, open capability analysis (inter-group / intra-group)

(CapabilityAnalysis (Between/Within)) main dialog box

■ [data arrangement as (Dataare arranged as)] is [single column (Single column)], and select "C1 (coating)" and [subgroup size (Subgroupsize)] is "C2 (paper roll)".

Set [lower specification (Lowerspec)] to 47

[upper specification limit (Upperspec)] is 53.

3. In the options (Options) dialog box (see figure 17-23), enter the target value of 50 in [Target (add Cpm to the table) (Target (adds Cpm to table))]; [use the tolerance of K × σ for capacity statistics (Usetolerance of K*sigma for capability statistics)] to 6; [PerformAnalysis] select [inter-group / intra-group analysis (Between/withinanalysis)] and [overall analysis (Overall analysis)]. [display (Display)] Select [Partsper million], and select [capacity Statistics (Cp, Pp) (Capabilitystats (Cp, Pp))].

IV. Main results and analysis

Pp and Cp are between 1 and 1.33, indicating that the process capability is normal, but there is still room for improvement; Ppk, Cpk, indicating that the distribution center deviates slightly, Cpm=1.18, indicating that the data is close to the target value. The expected failure rate of the roll coating thickness is 194ppm, indicating that the process is effective, as shown in figure 17-24.

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