Hello room,
Am struggling to do variation comparison between variables.

What is the best method to use to do this action?

The data are as follows.

I want to compare wk1 upto wk8 in one equation. How do i go about this using STATA?
Treatments wk1 wk2 wk3 wk4 wk5 wk6 wk7 wk8
TA 27.1 28.1 28.8 29.88 27.89 28 28.1 27.11
TA 27.4 27.14 28.4 28.79 27.87 26.9 27.12 26.12
TA 26.81 28.32 29.4 30.12 28.34 29 28.32 28
TA 26.78 28.1 28.5 26.39 27.96 27 29 26.81
TA 26.37 27.68 28.9 27.32 27.87 26.25 27.12 26.11
TA 26.51 27.2 28.7 28.92 28.92 27.56 30.17 27.89
TA 27.2 29.1 30.4 30.11 28.54 28.32 28.3 26.81
TA 27.12 29.24 31.1 29.07 27.81 27.11 26.81 26.11
TA 26.8 28.9 29.6 31.29 27.41 28.92 29.11 27.84
TA 27.9 28.3 32.92 29.26 28.8 29 26 27
TA 27.6 28.1 30.46 28.97 28.7 27.14 25.19 26.54
TA 27.8 28 33.12 29.74 29.3 29.46 27 27.88
TA 28.12 27.33 30.32 29.13 26.91 28.17 27 27.81
TA 28.04 28.1 29.42 28.12 26.25 27 26.34 26.8
TA 28.4 28.37 30.47 28.66 27.82 28.45 28.45 27.44
TA 26.39 28.1 29.6 27.11 27.4 28.14 29.1 28.1
TA 26.88 27.12 29.72 26.98 27.2 26.11 29.12 26.81
TA 27.94 28.32 29.95 28.49 28.22 28.89 28.71 28.11
TA 27.33 28.39 29.91 29.16 27.31 29.33 28.12 27.1
TA 26.81 28.11 29.98 28.94 28.4 27.01 27.81 26.1
TA 27.98 28.17 30.16 32.49 27.82 28.99 27.43 28.16
TB 27.3 27 28.97 28.98 26.87 27 27.88 27.9
TB 27 26.97 29.68 27.87 26.46 26.8 26.88 28.04
TB 27.1 28.66 28.9 30.46 27.14 29 28.84 27.57
TB 26.9 28.1 28.72 27.92 27.1 26.82 28.6 26.17
TB 26.4 27.9 28.6 27.11 26.53 26.4 26.98 26.19
TB 26.2 28.1 28.7 28.8 29.12 27.44 29.89 27.14
TB 27 29.4 28.44 30 26.81 26.98 27 26.84
TB 26.9 29 29.22 28.54 27.09 26.2 26.89 27.18
TB 27.2 28.91 29.62 31.82 27.61 28.98 29.68 27.44
TB 27.4 29.2 28.96 32.12 27.8 27.28 26.15 26.84
TB 27.1 28.65 29.14 29 27.9 27.12 25.81 26.1
TB 26.9 28.4 28.97 33.47 27.9 29.11 26.39 27.88
TB 28.7 27.91 28.92 32.11 26.52 27.14 27.01 26.82
TB 29 28.82 29.71 28.67 26.2 28.18 26.42 27.01
TB 28.4 28.13 30.2 33.61 27.81 28.48 28.82 27.01
TB 28.12 27.86 29.87 26.98 27.6 27 28.91 28
TB 27.39 26.98 30.33 26.76 26.9 26.89 29.14 27
TB 28.32 28.84 29.94 28.39 27.84 28.38 28.97 28.13
TB 27 28.81 29.82 28.32 26.51 27.38 28.12 27.5
TB 26.37 27.87 30.22 27.89 26.41 27.11 27.87 27.9
TB 27.92 28.9 30.09 33 27.88 29.89 28.18 26.98
TC 27.4 27.11 28.91 28.76 26.88 27.34 28.31 27.1
TC 27.1 26.81 28.64 27.37 26.41 26.6 28.88 26.89
TC 27.1 27.75 29.54 29.39 27.89 28.1 28.78 27.12
TC 26.8 27.9 28.66 27 27.24 26.3 28 26.88
TC 26.3 28.1 28.12 26.89 26.98 27.01 27.16 26.04
TC 26.8 27.2 28.53 27.88 27.04 27.89 30.88 27.18
TC 27 28.47 29.92 29.12 26.61 27.81 27.6 26.56
TC 26.8 28.36 30.14 27.14 26.91 26.32 26.81 27.88
TC 26.12 28.81 29.87 30.26 27.2 29.31 29.6 27.84
TC 27.6 28 28.91 28.16 27.5 27 26.83 26.88
TC 27.2 29.3 29.31 28.99 27.1 26.89 26 27
TC 27.8 29.1 29.24 33.66 28.2 28.16 27.81 27.43
TC 28.4 27.7 29.8 28.32 26.81 27.17 27.13 26.84
TC 29.3 28.51 28.76 27.14 26.24 26.87 26.81 26.49
TC 29.08 29.01 29.8 27.81 27.13 28.46 28.19 27.88
TC 28.11 28.31 27.69 27.41 26.52 27 28.91 27.11
TC 26.98 28.58 31.12 26.36 26.21 26.48 29.31 26.88
TC 27.84 28.78 29.31 28.89 27.2 28.89 29 27.81
TC 26.91 28.1 28.27 28.14 26.41 28.16 28.4 27.2
TC 26.81 27.69 28.82 28.82 26.44 27.89 27.65 26.93
TC 27.91 27.98 29.38 33.46 27.82 29.87 27.8 27.41
TD 27.5 27.41 30.02 28.27 26.84 26.9 27.91 27.18
TD 27.1 27.23 30.25 28.11 27.24 27 27.23 26.81
TD 27.2 27.87 30.21 30.17 27.49 28.36 28.36 27.01
TD 26.8 28.4 29.03 27.5 26.58 26.37 27.8 26.04
TD 26.3 28.3 28.81 27.31 29.44 26.01 26.88 26.43
TD 26.7 28.1 28.73 27.88 29.33 27.93 29.29 27.91
TD 27 28.14 29.65 28.98 27.41 27 27.5 26.56
TD 26.9 28.23 28.57 27.17 26.79 26 27.12 27.88
TD 26.12 28.46 29.64 32.28 27.53 28.92 28.61 27.11
TD 27.9 29.03 29.91 30.86 28.08 27.11 26.11 26.88
TD 27.4 29.17 29.94 29.14 28.13 26.55 26.09 27.83
TD 27.3 29 29.91 33.16 28.1 29.13 27.14 27.88
TD 29 27.14 28.7 27.88 26.93 27 27.16 26.44
TD 28.52 28.46 29.6 27.54 26.42 26.81 26.49 26.23
TD 29.2 29.19 30.6 27.14 27.86 27.89 28.43 27.81
TD 27.14 27.61 30.33 26.91 26.34 27.02 29.91 28
TD 26.89 27.23 31.34 27.88 26.11 26.89 29.94 27.81
TD 27.98 28.36 28.93 28.76 27.81 28.99 29.91 27.8
TD 26.84 29.29 28.87 30.12 27.31 26.88 28.35 27.17
TD 26.96 29.24 29.91 28.28 26.82 26.33 27.7 28.07
TD 27.48 28.48 28.98 33.05 27.81 27.99 28.8 27.76