I have been measuring flux of CO2 in (mmol m-2 d-1) from two different rivers and I now want to do a statistical analysis using IBM SPSS but Im not sure where to start. One lake is showing negative gas, the reason for this is because the lake as acted like a sink for the CO2.
I have made a histogram first see how the data looks like, as you can see in the figure I’ve added additional with a label of the data. As mention above the negative data is from one lake and the positive data is from another lake
The label show what lake I have studied, what time I started the measurement and when I stopped measuring, the column daytime (1) describes when the sun rise up and nighttime (2) describes when there is sunset, T_air oC and T_H2O describes describe the temperature in water and air during the measurement.
What I want to accomplish with the statistical analysis is first to understand how I should think before I start to analyzing;
- What is the statistically different within the two lakes?
- What is the statistically different are there between the two lakes? and
- How does the correlation between FCO2 and temperature?
Is there anyone who can come with some suggestion what statistically analysis I should use for each thing I want to accomplish? I have from somewhere I should use a one-way Anova but not sure where to start thinking.

\begin{table}[] \begin{tabular}{lllllll} lake & Initital sampling (data and time) & Final sampling (Date and time) & Daytime (1) nighttime (2) & T\_air oC & T\_H2O & FCO2\_mmol m-2 d-1 \\ Victoria & 2022-03-16 18:35 & 2022-03-16 20:18 & 1 & 4.5 & 4.5 & -2.29507 \\ Victoria & 2022-03-16 20:33 & 2022-03-16 22:15 & 2 & 4.35 & 4.35 & -2.48989 \\ Victoria & 2022-03-16 22:35 & 2022-03-17 00:16 & 2 & 4.22 & 4.22 & -2.52834 \\ Victoria & 2022-03-17 00:35 & 2022-03-17 02:18 & 2 & 4.02 & 4.02 & -2.4524 \\ Victoria & 2022-03-17 02:34 & 2022-03-17 04:13 & 2 & 4.12 & 4.12 & -2.47989 \\ Victoria & 2022-03-17 04:38 & 2022-03-17 06:15 & 1 & 4.36 & 4.36 & -2.18617 \\ Victoria & 2022-03-17 06:34 & 2022-03-17 08:16 & 1 & 5.35 & 5.35 & -1.86178 \\ Victoria & 2022-03-17 08:35 & 2022-03-17 10:17 & 1 & 6.07 & 6.07 & -2.42144 \\ Victoria & 2022-03-17 10:34 & 2022-03-17 12:18 & 1 & 7.44 & 7.44 & -2.52941 \\ Victoria & 2022-03-17 12:34 & 2022-03-17 14:17 & 1 & 8.16 & 8.16 & -2.21627 \\ Victoria & 2022-03-17 14:33 & 2022-03-17 16:19 & 1 & 7.97 & 7.97 & -2.55553 \\ Victoria & 2022-03-17 16:39 & 2022-03-17 18:17 & 1 & 7.52 & 7.52 & -2.0844 \\ Victoria & 2022-03-17 18:34 & 2022-03-17 20:17 & 1 & 7.54 & 7.54 & -2.43122 \\ Victoria & 2022-03-17 20:34 & 2022-03-17 22:17 & 2 & 8.06 & 8.06 & -1.96291 \\ Victoria & 2022-03-17 22:35 & 2022-03-18 00:18 & 2 & 7.41 & 7.41 & -1.54653 \\ Victoria & 2022-03-18 00:38 & 2022-03-18 02:18 & 2 & 7.60 & 7.6 & -1.591 \\ Victoria & 2022-03-18 02:35 & 2022-03-18 04:17 & 2 & 7.42 & 7.42 & -1.99879 \\ Victoria & 2022-03-18 04:36 & 2022-03-18 06:16 & 1 & 7.02 & 7.02 & -1.44514 \\ Victoria & 2022-03-18 06:35 & 2022-03-18 08:18 & 1 & 8.12 & 8.12 & -1.82221 \\ Victoria & 2022-03-18 08:33 & 2022-03-18 10:17 & 1 & 8.97 & 8.97 & -2.30534 \\ Victoria & 2022-03-18 10:34 & 2022-03-18 12:18 & 1 & 11.63 & 11.63 & -1.49893 \\ Victoria & 2022-03-18 12:37 & 2022-03-18 14:17 & 1 & 10.75 & 10.75 & -2.20711 \\ Victoria & 2022-03-18 14:38 & 2022-03-18 16:18 & 1 & 11.57 & 11.57 & -1.80309 \\ Victoria & 2022-03-18 16:41 & 2022-03-18 18:17 & 1 & 8.66 & 8.66 & -1.67234 \\ Victoria & 2022-03-18 18:37 & 2022-03-18 20:15 & 1 & 6.18 & 6.18 & -1.3983 \\ Victoria & 2022-03-18 20:37 & 2022-03-18 22:17 & 2 & 5.02 & 5.02 & -1.32119 \\ Victoria & 2022-03-18 22:34 & 2022-03-19 00:17 & 2 & 4.50 & 4.5 & -1.45022 \\ Victoria & 2022-03-19 00:34 & 2022-03-19 02:17 & 2 & 4.74 & 4.74 & -1.49234 \\ Victoria & 2022-03-19 02:35 & 2022-03-19 04:18 & 2 & 4.75 & 4.75 & -1.16388 \\ Victoria & 2022-03-19 04:35 & 2022-03-19 06:18 & 1 & 4.34 & 4.34 & -0.87719 \\ Victoria & 2022-03-19 10:33 & 2022-03-19 12:17 & 1 & 13.33 & 13.33 & -1.04391 \\ Victoria & 2022-03-19 12:34 & 2022-03-19 14:18 & 1 & 11.86 & 11.86 & -1.15754 \\ Victoria & 2022-03-19 14:37 & 2022-03-19 16:18 & 1 & 14.32 & 14.32 & -1.3017 \\ Victoria & 2022-03-19 16:35 & 2022-03-19 18:18 & 1 & 7.77 & 7.77 & -1.41987 \\ Victoria & 2022-03-19 18:33 & 2022-03-19 20:18 & 1 & 5.49 & 5.49 & -1.20405 \\ Victoria & 2022-03-19 20:35 & 2022-03-19 22:16 & 2 & 4.92 & 4.92 & -1.29523 \\ Victoria & 2022-03-20 08:34 & 2022-03-20 10:13 & 1 & 13.10 & 13.1 & -2.09114 \\ Victoria & 2022-03-20 10:34 & 2022-03-20 12:16 & 1 & 12.37 & 12.37 & -1.80007 \\ Victoria & 2022-03-20 12:32 & 2022-03-20 14:18 & 1 & 12.81 & 12.81 & -1.55716 \\ Victoria & 2022-03-20 14:34 & 2022-03-20 16:17 & 1 & 15.58 & 15.58 & -1.86034 \\ Victoria & 2022-03-20 16:34 & 2022-03-20 18:17 & 1 & 9.39 & 9.39 & -1.90103 \\ Victoria & 2022-03-20 18:33 & 2022-03-20 20:18 & 1 & 5.44 & 5.44 & -1.53041 \\ Victoria & 2022-03-20 20:35 & 2022-03-20 22:14 & 2 & 4.67 & 4.67 & -1.79374 \\ Victoria & 2022-03-20 22:37 & 2022-03-21 00:17 & 2 & 4.48 & 4.48 & -1.01154 \\ Denveer & 2022-03-29 21:55 & 2022-03-29 23:35 & 2 & \textbf{4.44} & 4.44 & 2.853022 \\ Denveer & 2022-03-29 23:56 & 2022-03-30 01:35 & 2 & \textbf{3.51} & 3.51 & 2.15667 \\ Denveer & 2022-03-30 01:56 & 2022-03-30 03:34 & 2 & \textbf{2.38} & 2.38 & 2.231913 \\ Denveer & 2022-03-30 03:54 & 2022-03-30 05:35 & 2 & \textbf{2.16} & 2.16 & 1.759635 \\ Denveer & 2022-03-30 05:53 & 2022-03-30 07:35 & 1 & \textbf{3.7} & 3.7 & 1.001419 \\ Denveer & 2022-03-30 07:56 & 2022-03-30 09:35 & 1 & \textbf{7.8} & 7.8 & 0.960555 \\ Denveer & 2022-03-30 09:53 & 2022-03-30 11:35 & 1 & \textbf{9.98} & 9.98 & 1.991259 \\ Denveer & 2022-03-30 11:56 & 2022-03-30 13:34 & 1 & \textbf{10.25} & 10.25 & 1.517868 \\ Denveer & 2022-03-30 13:51 & 2022-03-30 15:34 & 1 & \textbf{10.2} & 10.2 & 1.821623 \\ Denveer & 2022-03-30 15:53 & 2022-03-30 17:35 & 1 & \textbf{9.63} & 9.63 & 1.741887 \\ Denveer & 2022-03-30 17:54 & 2022-03-30 19:35 & 1 & \textbf{6.38} & 6.38 & 2.141064 \\ Denveer & 2022-03-30 19:55 & 2022-03-30 21:35 & 2 & \textbf{4.96} & 4.96 & 2.685757 \\ Denveer & 2022-03-30 21:56 & 2022-03-30 23:35 & 2 & \textbf{4} & 4 & 2.923715 \\ Denveer & 2022-03-30 23:52 & 2022-03-31 01:11 & 2 & \textbf{3.54} & 3.54 & 3.316899 \\ Denveer & 2022-03-31 01:52 & 2022-03-31 03:34 & 2 & \textbf{2.99} & 2.99 & 1.681422 \\ Denveer & 2022-03-31 07:55 & 2022-03-31 09:35 & 1 & \textbf{10.4} & 10.4 & 1.361125 \\ Denveer & 2022-03-31 13:58 & 2022-03-31 15:34 & 1 & \textbf{12.34} & 12.34 & 0.734101 \\ Denveer & 2022-03-31 15:55 & 2022-03-31 17:35 & 1 & \textbf{8.69} & 8.69 & 0.947828 \\ Denveer & 2022-03-31 17:54 & 2022-03-31 19:35 & 1 & \textbf{6.6} & 6.6 & 0.512018 \\ Denveer & 2022-03-31 19:53 & 2022-03-31 21:35 & 2 & \textbf{4.82} & 4.82 & 1.261292 \\ Denveer & 2022-04-01 06:04 & 2022-04-01 07:35 & 1 & \textbf{4.9} & 4.9 & 1.77807 \\ Denveer & 2022-04-01 09:54 & 2022-04-01 11:34 & 1 & \textbf{7.73} & 7.73 & 1.738892 \\ Denveer & 2022-04-01 12:02 & 2022-04-01 13:22 & 1 & \textbf{9.9} & 9.9 & 1.109685 \\ Denveer & 2022-04-01 13:51 & 2022-04-01 15:35 & 1 & \textbf{9.06} & 9.06 & 1.232822 \\ Denveer & 2022-04-01 15:56 & 2022-04-01 17:36 & 1 & \textbf{8.57} & 8.57 & 0.857767 \\ Denveer & 2022-04-01 17:56 & 2022-04-01 19:34 & 1 & \textbf{4.62} & 4.62 & 1.44003 \\ Denveer & 2022-04-01 19:53 & 2022-04-01 21:36 & 2 & \textbf{2.78} & 2.78 & 2.121573 \\ Denveer & 2022-04-01 22:04 & 2022-04-01 23:24 & 2 & \textbf{2.9} & 2.9 & 2.611131 \\ Denveer & 2022-04-02 00:01 & 2022-04-02 01:36 & 2 & \textbf{1.99} & 1.99 & 1.989111 \\ Denveer & 2022-04-02 01:56 & 2022-04-02 03:36 & 2 & \textbf{1.6} & 1.6 & 1.889324 \\ Denveer & 2022-04-02 03:56 & 2022-04-02 05:35 & 2 & \textbf{1.51} & 1.51 & 1.239421 \\ Denveer & 2022-04-02 05:54 & 2022-04-02 07:34 & 1 & \textbf{2.73} & 2.73 & 0.908215 \\ Denveer & 2022-04-02 07:58 & 2022-04-02 08:48 & 1 & \textbf{4.94} & 4.94 & 0.72762 \\ Denveer & 2022-04-02 10:04 & 2022-04-02 11:26 & 1 & \textbf{11.35} & 11.35 & 0.634685 \\ Denveer & 2022-04-02 13:59 & 2022-04-02 15:37 & 1 & \textbf{9.45} & 9.45 & 0.851654 \\ Denveer & 2022-04-02 15:54 & 2022-04-02 17:38 & 1 & \textbf{8.7} & 8.7 & 1.322688 \\ Denveer & 2022-04-02 17:58 & 2022-04-02 19:38 & 1 & \textbf{6.64} & 6.64 & 1.169257 \\ Denveer & 2022-04-02 19:54 & 2022-04-02 21:39 & 2 & \textbf{5.25} & 5.25 & 1.483866 \\ Denveer & 2022-04-02 22:00 & 2022-04-02 23:40 & 2 & \textbf{4.87} & 4.87 & 1.363993 \\ Denveer & 2022-04-03 00:04 & 2022-04-03 01:36 & 2 & \textbf{4.78} & 4.78 & 1.777732 \\ Denveer & 2022-04-03 02:00 & 2022-04-03 03:40 & 2 & \textbf{4.8} & 4.8 & 1.488471 \\ Denveer & 2022-04-03 03:56 & 2022-04-03 05:40 & 2 & \textbf{4.54} & 4.54 & 0.842322 \\ Denveer & 2022-04-03 05:57 & 2022-04-03 07:41 & 1 & \textbf{5.12} & 5.12 & 1.25267 \\ Denveer & 2022-04-03 07:58 & 2022-04-03 09:40 & 1 & \textbf{7.82} & 7.82 & 1.638629 \\ Denveer & 2022-04-03 10:02 & 2022-04-03 11:42 & 1 & \textbf{10.2} & 10.2 & 1.543532 \\ Denveer & 2022-04-03 11:59 & 2022-04-03 13:42 & 1 & \textbf{11.4} & 11.4 & 1.734148 \\ Denveer & 2022-04-03 14:02 & 2022-04-03 15:42 & 1 & \textbf{10.1} & 10.1 & 2.221091 \\ Denveer & 2022-04-03 16:01 & 2022-04-03 17:20 & 1 & \textbf{9.2} & 9.2 & 2.092675 \\ Denveer & 2022-04-03 19:59 & 2022-04-03 21:43 & 2 & \textbf{6.69} & 6.69 & 2.461853 \\ Denveer & 2022-04-03 22:03 & 2022-04-03 23:38 & 2 & \textbf{6.34} & 6.34 & 3.361063 \\ Denveer & 2022-04-04 00:01 & 2022-04-04 01:43 & 2 & \textbf{6.36} & 6.36 & 4.282346 \\ Denveer & 2022-04-04 02:02 & 2022-04-04 03:45 & 2 & \textbf{7.02} & 7.02 & 5.178646 \\ Denveer & 2022-04-04 04:08 & 2022-04-04 05:45 & 1 & \textbf{7} & 7 & 1.177135 \\ Denveer & 2022-04-04 06:08 & 2022-04-04 07:44 & 1 & \textbf{6.58} & 6.58 & 1.053295 \\ Denveer & 2022-04-04 08:07 & 2022-04-04 09:24 & 1 & \textbf{6.74} & 6.74 & 1.20853 \end{tabular} \end{table}