企业rd投入数据，计算基期资本存量时，发现平均增长率为较大的负数，导致分母即使加上折旧率还是负的，导致资本存量计算为负，数据构造发生偏差。想问问有没有大佬教教怎么处理这个问题
| id | year | real | k | av_growth |
| stock | year | 实际投资额 | 资本存量 | 平均增长率 |
| 000862 | 2015 | 11803913 | -48928197.63 | -0.3912497 |
| 000862 | 2016 | 18427386.69 | -23161581.3 | -0.3912497 |
| 000862 | 2017 | 4159344.96 | -15527999.14 | -0.3912497 |
| 000862 | 2018 | 1938654.941 | -11260144.33 | -0.3912497 |
| 000862 | 2019 | 1676087.7 | -7895034.98 | -0.3912497 |
| 000862 | 2020 | 768596.626 | -5942183.107 | -0.3912497 |
| 000862 | 2021 | 58749.12018 | -4992106.521 | -0.3912497 |
| 002256 | 2015 | 21875000 | -1865385271 | -0.1617268 |
| 002256 | 2016 | 18030326.29 | -1567547154 | -0.1617268 |
| 002256 | 2017 | 14685596.26 | -1317729485 | -0.1617268 |
| 002256 | 2018 | 12502051.36 | -1107568011 | -0.1617268 |
| 002256 | 2019 | 9880784.145 | -931552025.1 | -0.1617268 |
| 002256 | 2020 | 10953198.53 | -780866022.8 | -0.1617268 |
| 002256 | 2021 | 7017927.11 | -656718192.2 | -0.1617268 |
| 002260 | 2015 | 91548088 | -1543560126 | -0.2093097 |
| 002260 | 2016 | 102613063.6 | -1209413043 | -0.2093097 |
| 002260 | 2017 | 61245727.52 | -966755359.4 | -0.2093097 |
| 002260 | 2018 | 27619228.28 | -794122827.2 | -0.2093097 |
| 002260 | 2019 | 16821598.67 | -658182804.5 | -0.2093097 |
| 002260 | 2020 | 16313707.36 | -543141676.5 | -0.2093097 |
| 002260 | 2021 | 16258190.4 | -445412234.6 | -0.2093097 |
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